Hey, do you exercise often? A lack of exercise can lead to feeling down and like you have no energy.
Major thing though if you want to change your diet or lose weight, don't feel bad about yourself. That's the reason why a lot of people I know don't stay on their diets or exercise plans. They start to feel bad because they aren't getting the results right away and just give up. So try to stick to whatever you try, and good luck with it.
