High-Fiber Diet Associated with Fewer Symptoms of Depression in Older Adults

Food may be known to influence our mood, but little is known about the relationship between food choices and mental health. In an Australian study, scientists evaluated the Glycemic Index (a measure of how quickly carbohydrates spike blood sugar) and carbohydrate choices of 1,918 adults’ diets. Participants whose eating habits were highest on the Glycemic Index had a 55% higher likelihood of having depressive symptoms, compared to those with the lowest Glycemic Index intakes. When analyzed by the source of fiber, diets higher in total fiber (more than 27 grams per day), and fiber from vegetables and breads/cereals (mostly whole grain) were associated with a 42%, 46%, and 41% reduced likelihood of having depressive symptoms, respectively. Vegetable consumption was also linked with a significantly lower risk of depressive symptoms.
British Journal of Nutrition. 2016 Dec;116(12):2109-2114. (Gopinath B et al.)