There is a good deal of variation in how people respond to carbohydrates ... the same bread, fruit, sweets, etc.
The researchers made the discovery after fitting 800 people with blood glucose monitors for a week. The people ate standard breakfasts supplied by the researchers. Although the volunteers all ate the same food, their blood glucose levels after eating those foods varied dramatically. Traits and behaviors such as body mass index, sleep, exercise, blood pressure, cholesterol levels and the kinds of microbes living in people’s intestines are associated with blood glucose responses to food, the researchers conclude.
Those findings indicate that blood sugar spikes after eating depend “not only on what you eat, but how your system processes that food,” says Clay Marsh, an epigenetics researcher at West Virginia University in Morgantown.
Such individual differences have been noticed in previous studies, says study coauthor Eran Elinav, an immunologist at the Weizmann Institute of Science in Rehovot, Israel. While previous studies dismissed the differences as flukes, “we’re actually quantifying it,” Elinav says. For instance, eating bread produced a postmeal blood sugar level rise of 44 milligrams per deciliter of blood per hour on average. But some people’s blood sugar rose as little as 15 mg/dl*h, while others had a spike as high as 79 mg/dl*h after eating the same amount of bread.
a tip of the hat to Sukie