Q: how can i 20 pounds in 5 day or less and get rid of the man boobs

A: The most FAT you can lose in 5 days is ONE pound. Maybe TWO if you don't mind losing some muscle along with that. But that's it. There's no way no how you can trick your body into losing 20 pounds of FAT, no matter what diet you follow and what pills you take. Anyone who tells you otherwise is lying.

So what about all those diets that claim to make you lose 10-20-30 pounds in a week or two? What actually happens is you lose 1-2 pounds of actual fat, a bunch of water weight (water is retained in your system by carbs/glucose and is flushed out when you go on a starvation-type diet) and a bunch of muscle mass (because your body will prefer to use muscle rather than fat for energy under starvation conditions). Water weight comes back as you go back to your regular routine and it should come back since you don't want to be facing constant dehydration. Muscle mass does NOT come back which means you're that much more weak, your metabolism is that much lower, and you will accumulate new fat that much more easily!

Hopefully now those lose-20-pounds fast diets don't sound so appealing. They lose you just as much fat as you can lose through any moderate healthy diet (such as the ones described on this site) and actually lose LESS fat than you could lose through a good diet + exercise program. On top of that, they endanger your health, burn a bunch of your precious muscle, and leave you much more vulnerable to future fat gains. There is absolutely nothing good that can be said about these diets, except that they will temporarily set your scale back a few pounds. Those pounds and more will come back quickly and with a vengeance.

Instead of looking for quick fixes, you should educate yourself about good nutrition and exercise and start on a healthy, sustainable, long-term fat loss program. Please read this article and the other articles it refers. The sooner you commit yourself to doing the right thing, the faster your true fat and weight loss will start. Good luck!