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Harvard Men's Health Watch. You can get some of the same benefits of a low-glycemic-index diet by avoiding highly processed foods. The glycemic index is a number that indicates how rapidly the body digests a particular type of food and converts it into blood sugar (glucose). Some studies suggest that lower-glycemic-index diets may offer important health benefits for menâlike a reduced risk of heart disease and diabetes.
No you don't, because the effect of a low GI food carries over to the next meal, reducing its glycemic impact. This applies to breakfast eaten after a low GI dinner the previous evening or to a lunch eaten after a low GI breakfast. This unexpected beneficial effect is called the second meal effect.