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Take a look at a selection of our recent media coverage:

Low vitamin D levels linked to worse overall survival in invasive melanoma

21st September 2022

Low vitamin D levels in those with invasive melanoma are associated with a lower overall rate of survival but not melanoma specific survival

Low vitamin D levels (LVD) are independently associated with a worse overall survival among patients with invasive melanoma but not melanoma specific survival according to the findings of a retrospective analysis by Spanish researchers presented at the 31st Dermatology and Venereology congress and simultaneously published in the journal Melanoma Research.

Melanoma of the skin is the 17th most common cancer worldwide and there were more than 150,000 new cases in 2020. In recent years it has been suggested that there is positive association between circulating levels of vitamin D (Vit D) and the risk of melanoma although this is confounded by sun exposure. However, single nucleotide polymorphisms in the Vit D receptor gene may alter the expression or the function of the VDR protein leading to various diseases, including melanoma. In the present study, the Spanish team sought to analyse the relationship between Vit D levels and prognosis in patients with a melanoma. The team retrospectively examined patients with an invasive melanoma at a university hospital in Barcelona and assessed their Vit D level. Individuals were categorised as having either LVD (defined as < 10 ng/ml) or equal to or higher than 10 ng/ml. The team examined differences in overall survival (OS) and what they termed ‘melanoma-specific survival (MSS) based on levels of vitamin D and used multivariate survival analysis, adjusted for age, gender, Breslow index and season when the test was done, since this affected the intensity of ultraviolet radiation.

Low vitamin D levels and overall survival

A total of 264 invasive melanoma patients with a mean age of 57.51 years (54.2% women) were followed for a median of 6.7 years.

Survival analysis showed that after 5 years, 90.1%of those with a Vit D level > 10 ng/ml were still alive compared to 84.2% of those with levels < 10 ng/ml. In multivariable regression, the hazard ratio (HR) for OS was 2.45 (95% CI 1.28 – 4.68, p = 0.007), i.e., survival was significantly lower among those with lower levels of Vit D. However, when the researchers looked at MSS, the hazard ratio was non-significant (HR = 0.76, 95% CI 0.25 – 2.30, p = 0.629).

The authors suggested that these findings would suggest that vitamin D levels affect overall survival among patients with an invasive melanoma although levels did not appear to have any significant effect on melanoma-specific survival.

At the congress, Lead researcher Dr Inés Gracia-Darder, from the Hospital University Son Espases,Mallorca, Spain, commented that “although previous research has identified that normal levels of vitamin D play a protective role in melanoma survival, this study aimed to further understand this relationship. These findings suggest that vitamin D has a significant impact on people with melanoma, showing in particular that vitamin D deficient patients have a lower overall survival.’

No effect from vitamin D supplementation on acute respiratory infections or COVID-19

13th September 2022

Vitamin D supplementation given to those with a suboptimal status for 6 months had no impact on acute respiratory infections or COVID-19

Vitamin D supplementation (VDS) given to patients identified having suboptimal levels of the vitamin for a period of six months had no effect on the development of all cause acute respiratory infections or COVID-19 according to the findings of a randomised, placebo-controlled trial by a team of UK researchers.

Much has been written on the potential role of vitamin D or VDS as a means of preventing or reducing the adverse sequelae associated with a COVID-19 infection. In fact, regulation of immune function continues to be one of the most well-recognised extra-skeletal actions of vitamin D and there is data indicating that vitamin D up-regulates LL-37, a well-known antimicrobial peptide with antiviral effects and a which provides mechanism through which the vitamin could protect against COVID-19. Moreover, it is already known that vitamin D supplementation is associated with a small, but significant reduction in the risk of acute respiratory infections compared with placebo. During the course of the COVID-19 pandemic, a meta-analysis of observational studies involving nearly 2 million adults, suggested vitamin D deficiency/insufficiency increased susceptibility to COVID-19 and severe COVID-19, although there was a high risk of bias and heterogeneity in studies

However, there is a lack of randomised, controlled trials of VDS in COVID-19 apart from one small, double-blind, placebo-controlled trial of vitamin D supplementation in healthcare workers which found a 77% lower risk of becoming infected among those who received the supplement. For the present study, researchers used a test and treat approach to correct suboptimal vitamin D levels and to then determine the effect on the risk of all cause acute respiratory tract infections and COVID-19. Individuals were recruited from the COVIDENCE UK research study and offered a finger prick test to determine vitamin D status. Participants were then randomised into two groups if their blood 25-hydroxyvitamin D levels were < 75 nmol/L; a low group (800 IU/day) or a high group (3200 IU/day), for 6 month course of vitamin D supplementation. A third group, designated ‘no offer’ served as the placebo arm, i.e., those from the COVIDENCE trial who did not get supplementation and individuals were then randomised 2:1:1 (no offer, low dose, high dose). During the 6-month follow-up, participants were emailed every month with questionnaires to capture incident swab test positive or doctor diagnosed acute respiratory tract infections (including COVID-19) and details of any hospital admission, ventilatory support within hospital and prescriptions for antibiotics. The primary outcome was the proportion of participants who had at least one swab test confirmed or doctor confirmed acute respiratory tract infection. The secondary outcome was the proportion developing a PCR confirmed COVID-19 infection although subgroup analysis was performed examining the impact on hospitalisation and mortality.

Vitamin D supplementation and COVID-19 infection

A total of 6,200 participants with a median age of 60.2 years (67% female) were included and randomised to ‘no offer’ (3,100) or 800 IU/day (1550) with the remainder receiving the higher dose. By the end of the trial (June 2021), 89.1% of participants had one or more doses of a COVID-19 vaccine although at the start, only 0.4% of participants were fully vaccinated.

Overall, 299 participants experienced the primary end point, i.e., at least one test swab confirmed or doctor confirmed acute respiratory tract infection. Compared to the ‘no offer’ group, there was no statistically significant difference for the low dose group (Odds ratio, OR = 1.26, 95% CI 0.96 – 1.66 , p = 0.10) or for the higher dose group (OR = 1.09, 95% CI 0.82 – 1.46, p = 0.55).

For the secondary outcome of COVID-19 infection, there were also no significant differences for a swab confirmed test between the ‘no offer’ and low dose group (OR = 1.39, 95% CI 0.98 – 1.97, p = 0.07) or for the higher dose group (OR = 1.13, 95% CI 0.78 – 1.63, p = 0.53). Similarly, there were no significant differences for admission to hospital, in-hospital use of ventilatory support or death.

The authors concluded that while vitamin D supplementation led to increases in serum 25-hydroxyvitamin D levels, this was not associated with protection against all cause acute respiratory tract infections or COVID-19.

Citation
Jollife DA et al. Effect of a test-and-treat approach to vitamin D supplementation on risk of all cause acute respiratory tract infection and covid-19: phase 3 randomised controlled trial (CORONAVIT) BMJ 2022

Severe vitamin D deficiency associated with higher sepsis mortality and longer hospital stay

22nd July 2022

Severe vitamin D deficiency at emergency department admission for severe sepsis is linked to a higher mortality and longer hospital stay

Patients with severe vitamin D deficiency upon admission to an emergency department (ED) with severe sepsis have a higher level of mortality and a longer hospital stay according to the findings of a single centre, prospective study by researchers from Belgium and Italy.

Alterations in the levels of vitamin D have been associated with a higher susceptibility to immune-mediated disorders and inflammatory diseases. However, whilst research suggests that vitamin D has a potential role in the optimal functioning of the immune system, whether correction of vitamin D depletion, particularly among critical care patients, serves an important adjunctive role in either the prevention or treatment of infection is uncertain. In fact, if anything, the available evidence would indicate that vitamin D administration does not improve clinical outcomes among critically ill patients. Nevertheless, an important consideration is how vitamin D levels were normally measured once a patient had been admitted to hospital or after the provision of various treatments and this could have affected measured levels of the vitamin. As a result, in the present study, the researchers sought to determine whether severe vitamin D upon admission to an ED in those with severe sepsis was associated with a higher risk of mortality and a longer hospital stay.

The research team recruited adult patients admitted to the ED with a suspicion of severe sepsis and measured vitamin D levels alongside routine blood samples. Using the patient’s medical records, the team also collected demographic and clinical factors such as the age-adjusted Charleson Comorbidity Index (ACCI), Acute Physiological and Chronic Health Evaluation II (APACHE II) and Sequential Organ Failure Assessment (SOFA) scores. Severe vitamin D deficiency was defined as a level < 12 ng/ml and moderate severity as between 12 and 20 ng/ml. The primary outcome was set at 90-day all-cause mortality and for the secondary outcomes, the team selected a number of measures including the length of hospital stay.

Severe vitamin D levels and mortality

A total of 164 patients with a median age of 66.7 years (35% female) were included in the final analysis. Among the cohort, 46.3% of patients had vitamin D levels below 12 ng/ml and 121 of the cohort were admitted to intensive care. The 90-day all-cause mortality occurred in 26.4% of the entire cohort and the median hospital length of stay was 14 days.

Among those with vitamin D levels below 12 ng/ml, 32.9% of patients died compared to 20.5% in the non-severe deficiency group (p = 0.07) and in multivariable analysis after adjustment for sepsis severity and co-morbidities, this was found to be independently associated with 90-day mortality (odds ratio, OR = 2.69, 95% CI 1.03 – 7, p = 0.043). Using Cox analysis again adjusted for confounders, severe vitamin D deficiency was also associated with a lower chance of hospital discharge (hazard ratio, HR = 0.66, 95% CI 0.44 – 0.98, p = 0.043).

As with the overall cohort, among patients admitted to ICU, those with severe vitamin D deficiency had a higher risk of 90-day mortality (HR = 3.06, 95% CI 1.05 – 8.94, p = 0.04) and a lower chance of discharge (HR = 0.51).

Citation
Malinverni S et al. Severe vitamin D deficiency in patients admitted to the emergency department with severe sepsis is associated with an increased 90-day mortality Emerg Med J 2022

Study finds vitamin D status and COVID-19 diagnosis shows inconsistent associations

14th June 2022

A large study revealed no consistent associations between vitamin D status and COVID-19 outcomes such as infection, hospitalisation and death

There are inconsistent associations between vitamin D status and the diagnosis of COVID-19, hospitalisations and mortality according to the findings of a large cohort study by researchers from Faculty of Epidemiology & Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom.

Vitamin D is essential for bone health such that prolonged and severe vitamin D deficiency gives rise to rickets in children and osteomalacia in adults. Furthermore, vitamin D is an immune system modulator that induces an increase in antimicrobial proteins and activity against pathogens. In a systemic review of studies, it was found that supplementation with vitamin D results in a small reduction in the risk of acute respiratory infections although the role of vitamin D in COVID-19 remains uncertain. In a 2021 Cochrane review, the authors concluded that there is currently insufficient evidence to determine the benefits and harms of vitamin D supplementation as a treatment of COVID-19. But if vitamin D status and in particular, a deficiency of the vitamin, is associated with COVID-19, the use of supplements could be a valuable health intervention. As a result, for the present study, the UK team set out to examine the association between vitamin D status and several COVID-19 outcomes including infection, hospitalisation and death. They used data held within the UK Biobank and included individuals for whom at least one serum vitamin D test was available. Levels were recorded as deficient (< 25 nmol/L), insufficient (25 – 49 nmol/L) and sufficient ( > 50 nmol/L) and the primary outcome of interest was a laboratory confirmed infection with COVID-19. For their secondary outcomes, the team examined hospitalisation and mortality due to infection with the virus. The team also considered the risk of being diagnosed with COVID-19 when the vitamin D status was assessed, i.e., during the summer and winter months and used the definition of vitamin D sufficiency as the reference point. The analysis was performed using logistic regression after adjustment for covariates which included demographics, body mass index, smoking status and ethnicity.

Vitamin D status and COVID-19 outcomes

A total of 307, 512 individuals were included in the analysis of whom, 46% were deemed to vitamin D sufficient, 41% insufficient and 12% deficient. A total of 10,165 people became infected with COVID-19 with 51.4% of infections reported during autumn, 31% in the winter and only 3.8% in the summer.

Interestingly, during the summer months, participants who were vitamin D deficient had a 14% lower risk of being diagnosed with COVID-19 compared to those who were vitamin D sufficient (Hazard ratio, HR = 0.86, 95% CI 0.77 – 0.95, p < 0.01). In contrast, during the non-summertime months, the risk of becoming infected with COVID-19 was 14% higher among those who were vitamin D deficient (HR = 1.14, 95% CI 1.01 – 1.30, p = 0.04). However, there were no significant associations for individuals deemed vitamin D insufficient irrespective of the time of year.

With respect to COVID-19-related hospitalisations, compared to those who were vitamin D sufficient, there was no evidence that any other vitamin D status significantly affected the risk. Similarly, there was no evidence that the risk of COVID-19 mortality was affected by vitamin D levels.

In their conclusion the authors reported that there were inconsistent associations between vitamin D status and a diagnosis of COVID-19 and no clear association between vitamin D levels and either hospitalisation or death.

Citation
Lin LY et al. The association between vitamin D status and COVID-19 in England: A cohort study using UK Biobank PLoS One 2022

Combination of exercise, omega-3 fatty acids and vitamin D reduces cancer risk in the elderly

13th May 2022

A randomised trial has found that a combination of exercise, omega-3 fatty acids and vitamin D significantly reduces cancer risk in patients over 70

Cancer is the second leading cause of death globally and in 2018, it accounted for approximately 9.6 million deaths. Although cancer can strike at any age, many types of cancer become more prevalent with increasing age. However, recent research has found that for most adults, cancer does not have to be an inevitable consequence of growing older. In fact, adoption of healthy lifestyle measures based on a combination of exercise, diet, smoking status, alcohol consumption, and anthropometry, in other words, simple behavioural modifications, have been shown to produce a sizeable reduction in the risk of some cancers. Among healthy interventions, there is evidence that physical activity is associated with a lower risk of several cancers. Equally, use of vitamin D supplements has some evidence to support its use in reducing the incidence of advanced (metastatic or fatal) cancer. Finally, an omega-3 fatty acid-rich diet, can significantly delay mouse tumour growth when compared with a monounsaturated fatty acid-rich diet. Nevertheless, whether a combination of exercise, vitamin D and omega-3 fatty acids provides a synergistic and preventative effect against cancer is less clear.

For the present study, the researchers undertook a randomised controlled trial, which sought to examine the combination of exercise, supplementation with vitamin D and omega-3 fatty acids in older adults and how this impacted on the subsequent development of cancer. Their DO-HEALTH trial examined the combined effect of simple home strength exercise (SHEP), vitamin D (2000 IU/day) and/or 1g/day of marine omega-3 fatty acids, in healthy adults 70 years of age and older. For the primary outcome, the team considered the time to the development of a verified invasive cancer.

Combination of exercise, omega-3 fatty acids, vitamin D and cancer development

A total of 2157 individuals with a mean age of 74.9 years (61.7% female) were included in the study and followed for a median of 2.99 years. During this period of time there were 81 invasive cancers diagnosed and verified.

For the three separate interventions, the adjusted hazard ratios (compared to controls) were 0.76 (95% CI 0.49 – 1.18) for vitamin D, 0.70 (95% CI 0.44 – 1.09) for omega-3 fatty acids and 0.74 (95% CI 0.48 – 1.15) for SHEP). In other words, while there were beneficial effects from the individual interventions, the effects were not statistically significant, but when two of the interventions were combined, the effect did become statistically significant. For instance, the combination of SHEP and omega-3 resulted in an adjusted hazard ratio of 0.52 (95% CI 0.28 – 0.97, p = 0.039). However, the greatest benefit was derived from the combination of exercise, vitamin D and omega-3 fatty acids, with an adjusted hazard ratio of 0.39 (95% CI 0.18 – 0.85, p = 0.017).

The authors calculated that the number needed to treat to prevent one incident case of cancer after three years with the three treatments combined was 35.

They concluded that future studies should focus on the benefit of combining interventions as a means of cancer prevention.

Citation
Bischoff-Ferrari HA et al. Combined Vitamin D, Omega-3 Fatty Acids, and a Simple Home Exercise Program May Reduce Cancer Risk Among Active Adults Aged 70 and Older: A Randomized Clinical Trial Am J Clin Nutr 2022

Oral bolus of vitamin D at admission failed to improve overall COVID-19 outcomes

4th March 2022

An oral bolus of 100,000 IU of vitamin D given to patients with COVID-19 upon admission to hospital was of no overall benefit

The use of a large oral bolus of cholecalciferol (vitamin D) given to patients with moderate-to-severe COVID-19 upon admission to a hospital failed to improve overall outcomes compared with no treatment. This was the conclusion of a large, randomised trial by researchers from the Hospital Universitario Central de Asturias (HUCA), Avda. Roma, Spain. However, in a separate subgroup analysis, it did appear that there were positive benefits among those with higher baseline calcidiol levels upon admission.

An inverse relationship has been established between vitamin D levels and the development of several autoimmune diseases although whether this effect on the immune system has a positive impact upon the body’s ability to fight respiratory infections and on chronic diseases is currently uncertain. Much has been written on the potential benefits of vitamin D among patients with COVID-19 and one systematic review concluded that low vitamin D levels represent an increased risk of acute respiratory distress syndrome, admission to an intensive care unit or mortality due to COVID-19 infection. Nevertheless, a limitation from the aforementioned systematic review, it how the data were derived from observational studies and there has been a distinct absence of randomised, controlled trials, which can provide more robust evidence.

For the present study, the Spanish team undertook a randomised trial (COVID-VIT-D) to investigate whether a single, large, oral bolus of 100,000 IU of cholecalciferol given upon admission to hospital, could impact on the outcomes associated with a COVID-19 infection. Eligible patients (18 years and over) were those hospitalised for moderate-to-severe COVID-19 infection and who were randomised 1:1, to receive a single oral bolus of cholecalciferol or nothing. Patients were followed from admission until discharge and demographic, co-morbidity, biochemical, imaging results and all treatments used were recorded. The three primary outcomes for the trial were: length of hospitalisation; admission to an intensive care unit (ICU) and mortality. In a separate cohort analysis, the researchers examined the relationship between serum calcidiol upon admission with pulmonary involvement and the same three primary outcomes of the trial.

Single oral bolus and COVID-19 outcomes

A total of 543 patients with a median age of 58 years (65% male) were randomised to vitamin D (274) or nothing. The most frequent co-morbidities were hypertension (43.8%), diabetes (24.7%) and cardiovascular disease (21.2%). In addition, pulmonary involvement was diagnosed in 83.1% of those upon admission.

With respect to the primary outcomes, there were no differences between the two groups. The median length of hospital stay was 10 vs 9.5 days (vitamin D vs control), admission to ICU (172.% vs 16.4%) and mortality (8% vs 5.6%).

When considering the lowest (< 10ng/ml) and highest(> 25 ng/ml) baseline levels, the presence of a higher calcidiol level was associated with a lower risk of pulmonary involvement upon admission (odds ratio, OR = 0.21, 95% CI 0.08 – 0.60) and a lower risk of ICU admission (hazard ratio, HR = 0.35, 95% CI 0.13 – 0.95). However, baseline calcidiol levels had no effect on the length of hospitalisation or mortality.

The authors concluded that while a single oral bolus of vitamin D did not improve overall outcomes for those hospitalised with COVID-19, higher baseline calcidiol levels did appear to have better outcomes.

Citation
Cannata‐Andía JB et al. A single-oral bolus of 100,000 IU of cholecalciferol at hospital admission did not improve outcomes in the COVID-19 disease: the COVID-VIT-D—a randomised multicentre international clinical trial BMC Med 20222


Vitamin D-deficient patients 14-times more likely to get severe COVID-19

7th February 2022

Vitamin D-deficient patients are more likely to get severe COVID-19 and die compared with those with sufficient levels of the vitamin

Vitamin D-deficient individuals have been shown to be much more likely to experience severe COVID-19 and die in comparison to those with normal or sufficient levels of the vitamin. This was an important finding by researchers from the Department of Otolaryngology, Head and Neck Surgery, Galilee Medical Center, Israel.

Previous research has shown how vitamin D has a protective effect against respiratory tract infections when taken as a once daily dosage. Moreover, a 2021 systematic review which included 46 randomised controlled trials with 48,488 individuals, re-affirmed the benefits of daily supplementation with 400 –1000 IU of vitamin D for reducing the risk of acute respiratory tract infections compared with placebo. Several studies undertaken during the COVID-19 pandemic have suggested that a vitamin D deficient status was associated with increased COVID-19 risk. Furthermore, other data has shown how the vitamin D level is markedly low in severe COVID-19 patients although this was measured once in hospital. However, what is less clear, is the extent to which pre-infection or baseline vitamin D levels, impact on the clinical outcomes once patients become infected with COVID-19.

For the present study, the Israeli team set out to determine whether COVID-19 disease severity correlated with patient’s most recent vitamin D levels as documented in their medical records. They undertook a retrospective study of hospitalised, adult patients with a PCR-confirmed COVID-19 infection. The team defined COVID-19 disease severity at the point of highest severity. For instance, if a patient was admitted with mild disease and which subsequently deteriorated, this would be categorised as a critical illness. They used the most recent medical record for vitamin D status and then categorised patients as vitamin D deficient (< 20 ng/ml), insufficient (20 – 29.9 ng/ml), adequate (30 – 39.9 ng/ml) and high-normal (40 ng/ml). They used multivariable analysis to examine the relationship between vitamin D status and COVID-19 disease severity.

Vitamin D deficient status and COVID-19 severity

A total of 253 individuals with a mean age of 63.3 years (56.9% female) were included in the analysis. Among the cohort, 52.5% were vitamin D-deficient, 14.2% had levels between 20 and 30ng/ml and 15.8% had a level of 40ng/ml or above.

Mortality from COVID-19 occurred in 2.3% of those with adequate vitamin D levels and 25.6% of individuals who were vitamin D deficient (p < 0.001). When stratifying COVID-19 disease severity with vitamin D status, among those with the lowest vitamin D levels, a higher proportion (87.4%) developed severe or critical COVID-19 compared to mild to moderate disease, 34.3% (p < 0.001). In regression analysis, patients with vitamin D deficiency compared to those with high-normal levels (40 ng/ml) were 14 times more likely to develop severe or critical illness (odds ratio, OR = 14, 95% CI 4 – 51, p < 0.001). Overall, when comparing pre-hospital vitamin D levels with COVID-19 disease severity, there was a clear inverse relationship such that as vitamin D levels reduced, COVID-19 disease severity increased.

Further analysis revealed that age was an independent risk factor for more severe disease and the strongest correlation between vitamin D status and COVID-19 severity occurred in those aged 50 years and over (r = – 0.74, p < 0.001). However, this correlation was still significant among those under 50 years of age (r = -0.66, p < 0.001).

The authors described how early on in the current pandemic, there was much debate on the role of vitamin D in protecting against COVID-19. They suggested that their study provided further evidence of how vitamin D deficient patients were at a much higher risk of more severe COVID-19 infection and called for further studies to investigate if and when vitamin D supplementing in those who are deficient, impacts on COVID-19-related outcomes.

Citation
Dror AA et al. Pre-infection 25-hydroxyvitamin D3 levels and association with severity of COVID-19 illness PloS One 2022

Vitamin D and omega-3 fatty acids reduce autoimmune disease incidence

2nd February 2022

Vitamin D and omega-3 fatty acids when taken for a period of 5 years have been found to reduce the incidence of new autoimmune disease

Vitamin D and omega-3 fatty acids taken by adults over a 5-year period led to a 22% reduction in the incidence of autoimmune disease compared to placebo. This was the conclusion of a randomised trial by researchers from the Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, USA.

An autoimmune disease develops due to an immune-mediated attack on the body’s own organs although the underlying pathology for most conditions remains uncertain. Moreover, an estimated 4% of the global population is affected by one of the 80 different autoimmune disease which include conditions such as type 1 diabetes, rheumatoid arthritis, lupus, Crohn’s disease and scleroderma. Although epidemiological evidence indicates a potential preventative role for vitamin D in autoimmune diseases, prospective data are lacking. In addition, a Danish cohort study found that each additional 30g intake of fatty fish containing omega-3 oils was associated with 49% reduction in the risk of rheumatoid arthritis.

However, little is known about the potential synergistic effect of vitamin D and omega-3 fatty acids on the development of an autoimmune disease and this was the purpose of the present study by the US team. They undertook a randomised, placebo-controlled trial, VITAL, which was designed to investigate whether taking daily supplements of vitamin D3 (2000 IU) or omega-3 fatty acids reduced the risk of developing cancer, heart disease, and stroke in people who do not have a prior history of these illnesses. However, for the present analysis, the team focused on the development of the autoimmune diseases such as rheumatoid arthritis, polymyalgia rheumatica, autoimmune thyroid disease and psoriasis. For the trial, participants were randomised to vitamin D or matching placebo and omega-3 fatty acids or matched placebo and self-reported all incidence autoimmune diseases which were confirmed by a review of their medical records. The primary outcome of interest was the incidence of all autoimmune diseases.

Vitamin D and omega-3 fatty acids and autoimmune diseases

A total of 25,871 individuals with a mean age of 67.1 years (50.6% female) were enrolled and followed for a median of 5.3 years. In the vitamin D arm, 123 individuals and 155 in the placebo group had a confirmed autoimmune disease (hazard ratio, HR = 0.78, 95% CI 0.61 – 0.99, p = 0.05). In the separate omega-3 fatty acids arm, 130 compared with 148 in the placebo group developed an autoimmune disease although this difference was non-significant (HR = 0.85, 95% CI 0.67 – 1.08, p = 0.19).

Using a Cox model adjusted for age, sex and race, the authors found that among those randomised to both vitamin D and omega-3, the incidence of confirmed autoimmune disease was lower (HR = 0.69, 95% CI 0.49 – 0.96) compared with placebo.

They concluded that vitamin D supplements with or without omega-3 fatty acids reduced the development of autoimmune diseases.

Citation

Hahn J et al. Vitamin D and marine omega 3 fatty acid supplementation and incident autoimmune disease: VITAL randomized controlled trial BMJ 2022

Risk of early-onset colorectal cancer reduced by higher intake of vitamin D

3rd August 2021

A large prospective study has revealed that a higher intake of vitamin D in women is linked to a lower risk of early-onset colorectal cancer.

Colorectal cancer is the third most common cancer worldwide, accounting for an estimated 1.8 million new cases and over 880,000 deaths in 2018. However, the incidence of early-onset colorectal cancer (EOCRC), defined as colorectal cancer in those under 50 years of age, is increasing by approximately 7.9% per year among those aged 20 – 29 years. Moreover, EOCRC is more often diagnosed at an advanced stage. While the reasons for this are uncertain, it could be linked to sedentary behaviour or obesity. A further compounding factor, is the delay in seeking advice with one study in 1089 patients with EOCRC, reporting that nearly two-thirds of patients waited 3 – 12 months before seeking medical advice, with many indicating that they were initially misdiagnosed.

One potential protective factor against colorectal cancer is vitamin D and there is evidence of a strong inverse relationship between vitamin D levels and the risk of colorectal cancer. Nevertheless, whether reduced plasma levels of vitamin D are also associated with the development of early-onset colorectal cancer is uncertain. In trying to ascertain the relationship between these two factors, a team from the Department of Epidemiology, Harvard TH Chan School of Public Health, Boston, US, turned to the Nurses’ Health Study II which is a prospective cohort study of 116,429 female nurses aged between 25 and 42 years and which began in 1989. Study participants are followed every 2 years by self-administered questionnaires which captures information on demographics, lifestyle factors, the presence of co-morbidities etc and a food frequency questionnaire, every 4 years. For the present study, the researchers set the primary end point as the development of EOCRC, identified from medical records. In addition, the researchers collected data on the presence of adenomas and serrated polyps, which are pre-cancerous lesions. The plasma vitamin D levels were estimated based on factors such as dietary intake, age, race etc using a previously defined model.

Findings
A total of 94,205 women were included in the analysis and there were 111 documented cases of early-onset colorectal cancer detected between 1991 and 2015. The median vitamin D intake was 372 IU/day and vitamin D levels > 450 IU/day were associated with a reduced risk of developing EOCRC compared to intakes < 300 IU/day (hazard ratio, HR = 0.49, 95% CI 0.26–0.93). The HR per 400 IU/day increases was 0.46 (95% CI 0.26–0.83). Interestingly, the researchers also found that the HR for dietary vitamin D intake had a stronger inverse association with the development of EOCRC per 400 IU/day increase than among supplement users (0.34 vs 0.77, dietary vs supplements). There were 1439 newly diagnosed adenomas and 1878 serrated polyps in those aged less than 50 years and again, higher vitamin D intake was associated with a lower risk of developing either lesion.

The authors concluded that given the association between higher vitamin D intake and early-onset colorectal cancer, strategies to ensure adequate intake of the vitamin could serve as an important preventative measure in younger adults.

Citation
Kim H et al. Total Vitamin D Intake and Risks of Early-Onset Colorectal Cancer and Precursors. Gastroenterology. 2021

More evidence for the protective effect of vitamin D in COVID-19

29th September 2020

Much has been written during the current pandemic inferring that vitamin D has a protective role against COVID-19.

Although in a recent review, NICE concluded that there was no evidence to support either a preventative or treatment role for vitamin D, new evidence from an analysis of a large patient cohort, suggests an inverse relationship between levels and positive COVID-19 status, implying that the vitamin has a protective role.

A team of US researchers retrospectively analysed a large, anonymous patient data set 50 US states and the District of Columbia between March and June 2020, for whom 25-hydroxyvitamin D (25(OH)D) levels were recorded in the previous 12 months. They limited their analysis to one COVID-19 test result per patient and included all available demographics including ethnicity and categorised 25(OH)D status as either low (<20ng/ml), adequate (30-34ng/ml) or higher ( >60ng/ml).

Findings
In total, 191,779 patients were included with a mean age was 54 years (68% female) and overall the COVID-19 positivity rate was 9.3%. When examining the relationship between 25(OH)D levels and COVID-19 positivity, the rate was highest among those with a low vitamin D status (12.5%) and decreased as it improved, being 8.1% for those with adequate levels and 5.9% among those with the highest levels.

In terms of ethnicity, COVID-19 positive rates were highest in black individuals (15.7%) compared to Hispanics (12.8%) and lowest in white, non-Hispanics (7.2%, p< 0.001 for both comparisons). Furthermore, the difference in positivity rates between ethnic groups was reflected in mean 25(OH)D levels, which were 33.0 vs 29.1 vs 28.8 ng/ml for white, blacks and Hispanic individuals (p< 0.001) respectively. In regression analysis, there was a strong association between vitamin D levels and lower COVID-19 after adjustment for all demographic factors (adjusted odds ratio = 0.98 per ng/ml increment).

The authors concluded that their findings provide a further rationale to explore the role of vitamin D supplementation to reduce the risk of COVID-19 infection.

Reference
Kaufman HW et al. SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels. PLoS ONE 15(9): e0239252. https://doi.org/ 10.1371/journal.pone.0239252