1. Get at least 8 hours of sleep. when you’re sleep-deprived, you reach for unhealthy foods, like sugars and starches, to get a quick energy hit—even when you aren’t hungry. Plus you never feel like exercising!

2. Eat breakfast. Eating first thing in the morning gets your metabolism going. Breakfast eaters also feel less hungry all day, so they deal with fewer crazy junk food cravings. Try to eat something that combines protein, which keeps you satisfied, and fiber, that helps you feel fuller longer.

3. Smaller portions. Especially in America, portions tend to be larger in restaurants. As a result, it is easy to overeat. Try taking that portion provided, split it in half with your fork, and eat half of the meal. Wait a while, and if you’re still hungry, you can eat more. You’ll usually be full!

4. Eat slowly. Try chewing 20 times before you swallow. That way, you’ll get fuller faster and also be able to digest better.

5. Don’t eat while you’re distracted. About 86% of you eat while doing other things, like talking on the phone or watching TV, and this puts you at risk of overeating. Why? Your brain doesn’t hear your stomach saying “I’m full” when it’s focused on something else!

6. Workout when you’re bored. It is easy to eat when you’re bored, just because you have nothing else to do. Wrong! You can do 40 crunches, 25 jumping jacks, or 15 sit-ups instead.

7. Drink water. Sodas, juices, smoothies, bottled sweet teas—you think of them as just drinks, but many have enough calories to be a meal or snack! Plus, since they have tons of sugar, they can spike your hunger and make you eat more all day.

source: Teen Vogue 

http://nutrition.about.com/library/bl_nutrition_guide.htm