That is a loaded question. There's lots that go into it. Understanding your specific body needs is very complicated. Every body is unique and has its own compass to guide you to know what's best for it. The problem is we've been taught to ignore the signals and we try to think it instead of feeling what's best. Understanding the digestive system and how it prefers to work is important. A common misconception is around our internal environment. Meaning what's going on inside, how are our hormones fluctuating, which nervous system are we in. This is influenced by our mental state. So if you're constantly stressed, you will activate a specific nervous system branch which makes it very hard to lose weight. I have a free guide called Nutrition 101, if you want me to send it to you please message me where to send it.