Has anybody sucessfully done this? I just read the UD2 diet and there's essentially no way in hell I could stick with it. Here's why: No can do. So I'm looking for an alternative that doesn't hinder muscle growth (or maintenance) but allows for fat burning. This can even mean increased cardio or something. But 1500 cals a day is tough enough. 1500 cals a day with such a specific c/p/f ratio would be virtually impossible for me.