Researchers from around the globe analyzed ﬁndings from 102 randomized clinical trials, encompassing 4,660 participants, to see how diﬀerent types of fat (saturated, unsaturated, and polyunsaturated) and carbohydrates aﬀect diabetes markers (including blood sugar, insulin production, and insulin sensitivity). Polyunsaturated fats are found in fatty ﬁsh (salmon, trout, mackerel) and plant oils (soybean, sunﬂower, corn oil), while monounsaturated fats are found in olive and canola oil, and saturated fats are found in red meat and dairy products. The authors found that “substituting carbohydrate and saturated fat with a diet rich in unsaturated fat, particularly polyunsaturated fat, was beneﬁcial for the regulation of blood sugar.” However, the authors did not test the eﬀect of diﬀerent types of carbohydrate sources (such as diﬀerentiating between whole grains, reﬁned grains, or sugars).
PLOS Medicine. 2016 Jul 19;13(7):e1002087. (Imamura F et al.)