Protein diet shakes will make you feel like you 've decided on a Formula Diet (see Losing Weight with Diet Drinks ). Then one or more meals are left out and instead you consume a protein shake. These diets allow you to lose weight quickly, but, as is unfortunately always the case after such radical reduction diets, favor the yo-yo effect (see Losing Weight Without Jojo Effect ). Rapid Tone Diet If you want to lose weight permanently with protein shakes, you should only occasionally replace a meal with it. But always keep an eye on your entire energy balance, because too much protein is not conducive to good health. http://supplement4help.com/rapid-tone-diet/