Your personal trainer

Is you. Start small. Small changes are a lot easier to stick with than drastic ones. Try reducing the size of the portions you eat and giving up regular soda for a week. Once you have that down, start gradually introducing healthier foods and exercise into your life.

Stop eating when you're full. Lots of people eat when they're bored, lonely, or stressed, or keep eating long after they're full out of habit. Try to pay attention as you eat and stop when you're full. Slowing down can help because it takes about 20 minutes for your brain to recognize how much is in your stomach. Sometimes taking a break before going for seconds can keep you from eating another serving.

Avoid eating when you feel upset or bored — try to find something else to do instead (a walk around the block or a trip to the gym are good alternatives). Many people find it's helpful to keep a diary of what they eat and when. Reviewing the diary later can help them identify the emotions they have when they overeat or whether they have unhealthy habits. A registered dietitian can give you pointers on how to do this.

Eat less more often. Many people find that eating a couple of small snacks throughout the day helps them to make healthy choices at meals. Stick a couple of healthy snacks (carrot sticks, a low-fat granola bar, pretzels, or a piece of fruit) in your backpack so that you can have one or two snacks during the day. Adding healthy snacks to your three squares and eating smaller portions when you sit down to dinner can help you to cut calories without feeling deprived.

Five a day keep the pounds away. Ditch the junk food and dig out the fruits and veggies! Five servings of fruits and veggies aren't just a good idea to help you lose weight — they'll help keep your heart and the rest of your body healthy. Other suggestions for eating well: replace white bread with whole wheat, trade your sugary sodas for lots of water and a few cups of low-fat milk, and make sure you eat a healthy breakfast. Having low-sugar, whole grain cereal and low-fat milk and a piece of fruit is a much better idea than inhaling a donut as you run to the bus stop or eating no breakfast at all! A registered dietitian can give you lots of other snack and menu ideas.

Avoid fad diets. It's never a good idea to trade meals for shakes or to give up a food group in the hope that you'll lose weight — we all need a variety of foods to stay healthy. Stay away from fad diets because you're still growing and need to make sure you get proper nutrients. Avoid diet pills (even the over-the-counter or herbal variety). They can be dangerous to your health; besides, there's no evidence that they help keep weight off over the long term.

Don't banish certain foods. Don't tell yourself you'll never again eat your absolutely favorite peanut butter chocolate ice cream or a bag of chips from the vending machine at school. Making these foods forbidden is sure to make you want them even more. Also, don't go fat free: You need to have some fat in your diet to stay healthy, so giving up all fatty foods all the time isn't a good idea. The key to long-term success is making healthy choices most of the time. If you want a piece of cake at a party, go for it! But munch on the carrots rather than the chips to balance it out.

Get moving. You may find that you don't need to cut calories as much as you need to get off your behind. Don't get stuck in the rut of thinking you have to play a team sport or take an aerobics class to get exercise. Try a variety of activities from hiking to cycling to rowing until you find ones you like.

Build muscle. Muscle burns more calories than fat. So adding strength training to your exercise routine can help you reach your weight loss goals as well as give you a toned bod. A good, well-balanced fitness routine includes aerobic workouts, strength training, and flexibility exercises.

Forgive yourself. So you were going to have one cracker with spray cheese on it and the next thing you know the can's pumping air and the box is empty? Drink some water, brush your teeth, and move on. Everyone who's ever tried to lose weight has found it challenging. When you slip up, the best idea is to get right back on track and don't look back. Avoid telling yourself that you'll get back on track tomorrow or next week or after New Year's. Start now.

Try to remember that losing weight isn't going to make you a better person — and it won't magically change your life. It's a good idea to maintain a healthy weight because it's just that: healthy. *