Does coffee prevent diabetes?

Some studies suggest that drinking coffee — whether caffeinated and decaffeinated — may actually reduce your risk of developing type 2 diabetes. If you already have diabetes, however, the impact of caffeine on insulin action may be associated with higher or lower blood sugar levels.

mayoclinic.org - Caffeine: Does it affect blood sugar? - Mayo Clinic

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Does caffeine affect blood sugar? Answer From M. Regina Castro, M.D.

The average U.S. adult drinks about two 8-ounce (240-milliliter) cups of coffee a day, which can contain around 280 milligrams of caffeine. For most young, healthy adults, caffeine doesn't appear to noticeably affect blood sugar (glucose) levels, and having up to 400 milligrams a day appears to be safe. Some studies suggest that drinking coffee — whether caffeinated and decaffeinated — may actually reduce your risk of developing type 2 diabetes. If you already have diabetes, however, the impact of caffeine on insulin action may be associated with higher or lower blood sugar levels. For some people with diabetes, about 200 milligrams of caffeine — or the equivalent of one to two 8-ounce (240-milliliter) cups of plain, brewed coffee — may cause this effect. Caffeine affects every person differently. If you have diabetes or you're struggling to control your blood sugar levels, limiting the amount of caffeine in your diet may provide a benefit.

With M. Regina Castro, M.D.

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Is rice good for diabetes?

White rice has a high glycemic index, meaning that it can cause spikes in blood sugar. Previous research has linked high glycemic index foods with increased type 2 diabetes risk.

hsph.harvard.edu - Eating white rice regularly may raise type 2 diabetes risk | News

Eating white rice on a regular basis may increase the risk for type 2 diabetes, according to new Harvard School of Public Health (HSPH) research. HSPH researchers from the Department of Nutrition—led by Emily Hu, research assistant, and Qi Sun, research associate—reviewed four earlier studies involving more than 352,000 people from China, Japan, the United States, and Australia who were tracked between four and 22 years. The researchers found that people who ate the most rice—three to four servings a day—were 1.5 times more likely to have diabetes than people who ate the least amount of rice. In addition, for every additional large bowl of white rice a person ate each day, the risk rose 10 percent. The link was stronger for people in Asian countries, who eat an average of three to four servings of white rice per day. People in Western countries eat, on average, one to two servings a week.

The study was published in the British Medical Journal March 15, 2012.

White rice has a high glycemic index, meaning that it can cause spikes in blood sugar. Previous research has linked high glycemic index foods with increased type 2 diabetes risk. “People should try to make a switch from eating refined carbs like white rice and white bread to eating more whole grains,” Sun told Time magazine.

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Can brown rice slow the spread of type 2 diabetes? (HSPH feature)

Carbohydrates and the glycemic load (HSPH Nutrition Source)

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