Anyone who has ever been on any kind of diet or fat loss program knows how a typical diet progresses. The weight comes off fast and easy during the first few weeks of any diet, then it starts to slow down a bit. After a few more weeks go by fat loss slows down a little more or stops altogether. The reason this happens is because the body senses that body fat levels are dropping and food is in short supply.
This may explain why the fat-burning effects of eating more protein were confirmed in a study published in the American Journal of Physiology. One group was fed a high-protein diet (just over 1 gram per pound of body weight per day) while the second group consumed an amount closer to the lower recommendation of the RDA (recommended dietary allowance). The group eating the higher-protein diet burned the most fat.