Chug H20 before a meal.
The water will take up room in your stomach, making you feel more full and reducing your appetite, says Christopher Mohr, M.S., R.D.
Any time your restaurant entree comes with a side of pasta, potatoes, or rice, ask for vegetables instead, says Jeff Volek, Ph.D., R.D. (Your server will be more than happy to accommodate you.)
Join a league.
That is, sign up for a sport such as softball, soccer, or even kickball. It'll automatically schedule exercise sessions into your week, and because you're part of a team, you'll have peer pressure that'll ensure you keep showing up.
Break between scoops.
That is, if you can't live without ice cream, cake, or other calorie-laden desserts, go ahead and have one scoop (about 1/2 cup) or one small slice. Then, if you still want more, wait 20 minutes. Typically, you'll find that while you wait, hormones kick in and trigger a feeling of fullness, reducing desire for that second serving.
Brush your teeth more often.
In a recent Japanese study of 14,000 people, researchers found that men who brushed their teeth frequently were leaner than men who did not. Thank that minty-fresh flavor, which may make you less likely to snack between meals.
Eat an unbalanced diet.
"By cycling your calorie intake so that you eat less calories one day and more the next, you'll keep your metabolism on its toes," says Volek. And that'll ensure you keep burning fat at a high rate. The key: Shoot for an average of 2,000 calories a day over a week's time.
Dial up an incline.
When you run outside, you apply force to the ground and propel your body weight forward all by yourself. When you run on a treadmill, the belt helps you. To counteract this, always walk or run on at least a 1% incline, the treadmill grade an English study found is nearly equivalent to outside running.
Stick to no-calorie drinks.
That means coffee, tea, diet soda, mixes such as Crystal Light and, of course, water.
Have breakfast every day.
Research from Harvard and Boston's Children's Hospital shows that obesity rates are 35%-50% lower in people who eat breakfast regularly, compared with folks who don't. Nutritionists believe a.m. meals help regulate insulin levels and hunger, so you're less likely to overeat throughout the reminder of the day.
Avoid foods that come in a bag or box.
Typically, these are highly processed carbs—foods that quickly raise blood-sugar levels and shut down your body's ability to burn fat.
Snack between meals.
This not only keeps you from being ravenous—and overeating—at lunch and dinner, it forces your body to process food all day long, which keeps your metabolism stoked.
Buy a TiVo.
And only watch the shows you record. By fast-forwarding through the commercials, and watching only the shows you care enough to set a season pass for, you can cut your TV viewing—and the amount of time you spend on the couch—by more than a third.