Should I follow a "low-carb" diet, or should I do "low-fat?"
Ultimately, the decision is up to you and your doctor, and between you and God--in partnership. I personally believe in eating a little of everything in moderation: a lot of vegetables and fruit, some meat, and a few carbohydrates. I do pay attention to the USDA Food Guide Pyramid, but only as a starting point.
I also truly believe that God gave us food instincts and cravings for good reason! We have mechanisms in us that tell us what to eat. But be careful: As we live in a world that’s saturated with advertising for foods that are not so healthy, our natural instincts easily get stymied. Appetities can get influenced just by being exposed to images and smells of tempting foods, and we don’t need them.
There could be other reasons for being "hungry," too. Sometimes when we crave a lot of carbs it’s really our bodies saying we need energy, which might be better found through exercise and rest. When I want a lot of protein, that craving could mean a lot of different things, like my amino acids are out of balance, or that I’m working too hard – I need to look a little deeper.
I recommend following a simple, instinctual, healthy and balanced food plan (in consultation with a doctor and with God). Forget the fads and try something you can sustain: reasonable, moderate portions of both carbs and fats.