Low-carb newbies often give up too soon
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The earlier stages of a low-carb diet are euphoric for a newbie. The body has switched from an insulin-driven system, which stores fat, to a glucagon-driven system, which causes the fat cells to open and release stored fat to burn for energy. The ketone test strips are a pleasing purple, the pants are becoming looser, and the weight is, pound by pound, packing its bags and heading for Miami. Everything seems to be humming along just fine, and then BAM! The dreaded stall. Weight loss comes to a screeching halt, and it's difficult for the newbie not to become discouraged and give up. Unfortunately, it's not just the newbies who succumb to dietary despair.
A high-fat, moderate-protein, and low-carb diet is very satiating, and keeps the insulin at bay. For many people, a low-fat, high-carb diet triggers insulin, causing monster cravings, fat storage, and lousy lipid panels. But a low-carb diet is not a license to eat 5,000 calories a day, unless the low-carber runs marathons for fun. For most of us, "running" is what we do when we eat too many sugar alcohols.
For more info: See Dr. Michael Eades' excellent post on the low-carb lifestyle and calories.