Higher consumption of fruit, vegetables and wholegrain foods are associated with a lower risk of developing type 2 diabetes, according to two studies published by The BMJ on July 8 (2020).
The findings suggest that even a modest increase in consumption of these foods as part of a healthy diet could help prevent type 2 diabetes.
In the first study, a team of European researchers examined the association between blood levels of vitamin C and carotenoids (pigments found in colourful fruits and vegetables) with risk of developing type 2 diabetes.
Vitamin C and carotenoid levels are more reliable indicators of fruit and vegetable intake than dietary questionnaires.
Their findings are based on 9,754 adults who developed new-onset type 2 diabetes and a comparison group of 13,662 adults who remained free of diabetes during follow-up.
Both groups were selected from among the 340,234 participants who were taking part in the European Prospective Investigation into Cancer and Nutrition (EPIC)-InterAct study in eight European countries.
After adjusting for lifestyle, social and dietary risk factors for diabetes, higher blood levels of vitamin C and carotenoids respectively, as well as their sum, were associated with a lower risk of developing type 2 diabetes when combined into a “composite biomarker score”.
Compared with those who had the lowest composite biomarker score, the risk in people whose biomarker score was in the top 20% of the population was half.
The risk in those with biomarker scores between these two extremes was intermediate.
The researchers calculate that every 66g per day increase in total fruit and vegetable intake was associated with a quarter lower risk of developing type 2 diabetes.
In the second study, researchers in the United States examined associations between total and individual wholegrain food intake and type 2 diabetes.
Their findings are based on 158,259 women and 36,525 men who were free from diabetes, heart disease and cancer, taking part in the Nurses’ Health Study, Nurses’ Health Study II, and Health Professionals Follow-Up Study.
After adjusting for lifestyle and dietary risk factors for diabetes, participants in the highest category for total wholegrain consumption had a 29% lower rate of type 2 diabetes, compared with those in the lowest category.
For individual wholegrain foods, the researchers found that consuming one or more servings a day of wholegrain cold breakfast cereal or dark bread was associated with a lower risk of type 2 diabetes (19% and 21% respectively), compared with consuming less than one serving a month.
For other individual whole grains with lower average intake levels, consumption of two or more servings a week, compared with less than one serving a month, was associated with a 21% lower risk for oatmeal, a 15% lower risk for added bran, and a 12% lower risk for brown rice and wheat germ.
These reductions in risk seemed to plateau at around two servings a day for total wholegrain intake, and at around half a serving a day for wholegrain cold breakfast cereal and dark bread.
Both studies are observational, so cannot establish cause, and there’s a possibility that some of the results may be due to unmeasured (confounding) factors.
However, both studies took account of several well-known lifestyle risk factors and markers of dietary quality, and the findings back up other research linking a healthy diet with better health.
As such, both research teams say their findings provide further support for current recommendations to increase fruit, vegetable and whole grain consumption as part of a healthy diet to prevent type 2 diabetes.
And for fruit and vegetables, the findings also suggest that consumption of even a moderately-increased amount among populations who typically consume low levels could help to prevent type 2 diabetes.
Order healthy high quality food delivered to your doorsteps at affordable prices with Dahmakan Promo Code.
Did you find this article insightful?
80% readers found this article insightful