there is no one best diet for everyone, but for 100% - eat green. If you are tired after eating - that means that you ate too much sugar (maybe pasta, potatoes or bread, fruits - not only sweets). If you are hungry quickly and need snacks - try to eat...more fat meat. Meat with vegetables, but without any pasta, potatoes, cheese etc... Only meat or fish with green vegetables. You have to listening to your body and decide what is healthy for you. Some people can eat cheese, milk etc but most adults can feel bad after this... This are only few tips, but the most important - think, what you eat and how you feel after it. Your body knows best what it needs (and it's not cakes and snaks )