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Regularly eating breakfast and fibre associated with a lower overall mortality risk

9th September 2021

Regularly eating both breakfast and fibre appears to be associated with a significantly reduced risk of overall and cardiovascular mortality.

It is often said that breakfast (BF) is the most important meal of the day and there are numerous studies indicating the positive health benefits among those who eat BF. For example, some evidence suggests that not eating breakfast is associated with an increased risk of heart disease, a 21% higher risk of developing type 2 diabetes and a greater risk of all-cause mortality. Nevertheless, while these data are relatively consistent, less is known about which BF foods are potentially associated with a lower incidence and risk of cardiovascular events. One dietary component that is present in common BF foods such as oatmeal, fruit and cereals, is fibre. Furthermore, a recent umbrella review of prospective observational studies concluded that higher fibre intake appears to positively impact on not only cardiovascular disease but overall mortality.

These data led a team from the Department of Family Medicine, West Virginia University School of Medicine, West Virginia, US, to confirm the association between BF, dietary fibre and mortality. The team used the National Health and Nutrition Examination Survey (NHANES) dataset and included individuals aged 40 years and over who self-reported on dietary intake between 1999 and 2002. To determine survival information, the team used a 2015 database which provided mortality follow-up details from the NHANES study. Using the NHANES data, the researchers included those who self-reported as BF eaters and based on the foods eaten, categorised dietary fibre intake as high (> 25 g/day) and low (< 25 g/day). Since hypertension, diabetes and cardiovascular disease can negatively impact on mortality, the analysis included these three factors as covariates. The primary outcomes of the study were all-cause and cardiovascular disease (CVD) mortality and the team included a cohort of non-breakfast eaters which served as a control group.

Findings
A total of 5761 individuals were identified, 4778 BF eaters with a mean age of 57.5 years (46.6% male) and the remainder, a matched cohort of non-breakfast eaters. The average calorie intake was higher in breakfast eaters compared to non-breakfast eaters (2041.1 vs 1871.1, p = 0.001). Furthermore, dietary fibre intake was also higher among BF eaters (16.9g vs 12.8 g, p < 0.0001). During the follow-up period of approximately 147.6 months, there were 2027 (35.2%) all-cause deaths and 469 (8.1%) CVD deaths. After adjustment for covariates, breakfast eaters had a reduced risk of all-cause mortality (adjusted Hazard ratio, aHR = 0.45, 95% CI 0.32 – 0.63) and CVD mortality (aHR = 0.79). Among BF eaters with a fibre intake > 25g/day, there was a 21% reduction in all-cause mortality (aHR = 0.79, 95% CI 0.66 – 0.96) compared to non-breakfast eaters. While there was a trend towards lower CVD mortality among breakfast eaters with fibre intakes > 25g/day, this was not significant (aHR = 0.82, 95% CI 0.50 – 1.35, p = 0.42). Among non-breakfast eaters, there were no significant associations between fibre intake and either all-cause or CVD mortality.
The authors concluded that the mortality benefit from eating breakfast observed in both their own and earlier studies appears to be linked with higher intake of fibre.

Citation
King DE et al. A Relationship Between Mortality and Eating Breakfast and Fiber. J Am Board Fam Med 2021