A proper diet helps with satiety, gut flora and the like which will have an impact on success, but ultimately losing weight is calories-in, calories-out. It's r

A proper diet helps with satiety, gut flora and the like which will have an impact on success, but ultimately losing weight is calories-in, calories-out. It's restriction. There's no way around it. You can lose weight without exercise as well. However, it's an essential part of a healthy lifestyle, just like proper nutrition, and can facilitate weight-loss.