What Do You Think Is The Most Important Part Of The HCG Diet? I think it's safe to assume, that the majority of people out there feel that the most important part of the HCG Diet is weight loss. And while it is a big part of the diet, I wouldn't say it's the most important. Because if you can't fix the problem, you won't be able to keep the weight off. So for that reason, I would say Phase 3 is probably the most crucial part of the HCG Weight Loss Diet. After all, this is the part that teaches you how to have a normal relationship with food. But What Is The Most Important Part Of Phase 3? Without a doubt the most important and beneficial part of Phase 3 is not only what, but how much you eat. Of coarse most of us know by now that you aren't supposed to eat sugars and starches for the first 21 days of Phase 3. After that, you should slowly add them into your diet just a little bit at a time. But what most people are not clear on, is exactly how m...