M.D. A study from Switzerland shows that refined carbohydrates are absorbed in the upper intestinal tract to increase risk for obesity and diabetes, while non-absorbable carbohydrates that are absorbed in the colon help to lower cholesterol and prevent heart attacks. You don't have to avoid all carbohydrates to lose weight. This study shows that you need to avoid only the carbohydrates that cause a high rise in blood sugar after you eat them. They call out insulin to make you hungry.
Carbohydrates are single sugars and chains of sugars.
Only single sugars can be absorbed. So the carbohydrates that can be broken down to single sugars easily are absorbed very rapidly to cause a high rise in blood sugar, which increase your risk for obesity, heart attacks, diabetes, and strokes. Other types of carbohydrates include fiber and nonabsorbable starches that are not absorbed in the upper intestinal tract, so they pass to the colon where bacteria ferment them into fatty acids that can be absorbed. These fatty acids help heal the lining of the colon and prevent colon cancer. They're absorbed into the bloodstream from the colon and travel to the liver where they help prevent heart attacks by blocking the synthesis of cholesterol.