A study has revealed that diet rich in foods high on the glycemic index such as rice may be associated with the risk for developing type 2 diabetes in Chinese and African-American women. The glycemic index measures the effect of carbohydrates on blood glucose levels.
However, eating more cereal fiber may be associated with a reduced risk for type 2 diabetes in African-American women. It is known that the body absorbs carbohydrates from different foods at different rates. This leads to varying effects on levels of blood glucose and the hormone insulin, which converts glucose into energy.
Foods high on the glycemic index, such as rice and other simple carbohydrates cause a rapid spike and then a drop in blood glucose, whereas high-fiber foods tend to be lower on the glycemic index and have a more gradual effect.
In one study, Supriya Krishnan, D.Sc., of Boston University School of Public Health, and colleagues examined data from 40,078 U.S. black women who filled out a food questionnaire in 1995.
The glycemic index and glycemic load were calculated. Every two years through 2003, the women answered follow-up questionnaires about their weight, health and other factors. During eight years of follow-up, 1,938 participants developed type 2 diabetes. Women who ate high–glycemic index foods or a diet with a high glycemic load had a higher risk for diabetes.
Although, women who ate more fiber from grains (cereal fiber) had a reduced risk; for women with a body mass index (BMI) of less than 25, women who ate about 1.5 grams of fiber per day were 59 percent less likely to develop diabetes than women who ate about 8.3 grams per day.