The probable mechanism is lower day - long insulin levels - allowing greater use of fat as the source of fuel - the same mechanism underlying the success of low GI diets. (glycemicindex.com)
Step 1: Swap high GI foods for low GI foods. (gisymbol.com)
If I try to fast after eating a lot of carbs I feel sick, but if I have kept my blood sugar steady with low GI foods, it's a snap. (idmprogram.com)