I think a big part of the weight loss process is mental strength. For people who have a diet filled with high calorie rich food, it's difficult to cut back. Especially if your diet has a lot of sugary food. You will literally face relapse symptoms as if you were on drugs. There is a medical term for it too. If you create a healthy food routine for yourself and control your cravings for the first 2 weeks or so, the rest of it should be easy. Giving up the rich foods is not physically difficult, just need to remind yourself of that.