Diet in this sense might be different. If you want to gain weight, you'd have to change your diet to eating more for a specific period. Vice versa for losing i

Diet in this sense might be different. If you want to gain weight, you'd have to change your diet to eating more for a specific period. Vice versa for losing it. If you want to change the way you eat, that's not to diet - that requires a lifestyle change in the way you see food. Meaning, you have to discipline yourself to eat well for life (generally).