Apples are definately good, but try to avoid anything with too much sugar in it. You'll have a boost of energy for a little while, but as soon as the sugar is used up, you'll be more tired then you were before.

I also heard that green tea (the real stuff) is a natural, healthy pick me up. That is, if you drink it regularly. (Like once or twice a day, I suppose.)

Also, eat HEALTHY food. Very simple. Don't eat crap, and eat according to the Food Guide, or whatever, and avoid processed foods. Try to add a lot more 'Vegetarian' choices to your diet. I don't recommend going full vegetarian, but I've heard that many people who go on vegetarian diets get a HUGE health boost, feel better, have MUCh more energy, etc.

Yup, so basically eat healthy, avoid processed foods, and add more vegitarian foods to your diet, and exercise a bit more. Hope you stop feeling lazy.