17 413 Japanese people were studied for 5 years. These results, for coffee, have also been shown in U.S. men for coffee and diabetes.
Those who drank more than 6 cups of green tea per day had a 33 percent lower risk of diabetes than those who drank less than one cup weekly.
Those who drank more than 3 cups of coffee per day had a 42 percent lower risk of diabetes than those who drank less than one cup weekly.
The estimated caffeine content was 153 mg per cup (170 mL) of coffee and 30 mg per cup (200 mL) of green tea.
Diabetes is costly: $132b U.S., and $92b U.S. of that is the drugs paid for and prescribed. What if you could drink tea or coffee, using food as medicine?
Why? If it’s the caffeine, it’s more energy expenditure or better use of glycogen in muscles. If it’s the antioxidants like epigallocatechin gallate in green tea and like chlorogenic acid in coffee, it might reduce insulin resistance.