Dieting is a very important part in losing weight and feeling good. And, just as important when building muscle and strength. Just remember its not only important physically but mentally as well.
Choosing which type of diet is best for you depends on what you want to get out of it. For example, guys, you may want to be lean and defined or you may want to bulk, ie get bigger, more muscle. When I lean out I stick to my macros. For me, a 200 pound guy, I need to be at: 160 carbs, 60 fats, 200 protein. Let me help you figure out what would work best for you.