In a study, one group of volunteers was fed a high-protein, low-carbohydrate diet; another group was fed a low-protein, high-carbohydrate diet  Both diets contained the same number of calories, and each volunteer' s diet prior to the experiment had contained moderate levels of proteins and carbohydrates  After ten days, those on the low-carbohydrate diet had lost more weight than those on the high-carbohydrate diet
Thus, the most effective way to lose body fat is to eat much protein and shun carbohydrates
A low-protein, high-carbohydrate diet causes the human body to retain water, the added weight of which largely compensates for the weight of any body fat lost, whereas a high-protein, low-carbohydrate diet does not.