In Case of a Snack Emergency

If you really want to snack -- and nothing else will do -- it may be possible to trick yourself into eating less.

People tend to eat the same number of food portions, no matter what the portion size, according to a study published in Psychological Science. Researchers offered participants a snack in two sizes: one small or one large Tootsie Roll, one small or one large scoop of M&M's, or one whole or one half-sized pretzel.

Regardless of which serving size subjects chose, they ate the same number of portions -- so the smaller-portion eaters ate less overall. To make this work for you, just choose smaller snack sizes and pay attention to the number of servings per container.

Go Green!

Enjoy coffee or tea?

Why don’t you switch your usual morning wake-up for a refreshing cup of green tea? Recent research has shown that green tea can help increase your metabolism and could help you burn an extra 78 calories a day. It tastes delicious and is an easy addition to your day.

Celebrity Fitness: Katherine Heigl

Before filming her new movie, Knocked Up, Katherine Heigl hated working out. But since meeting Hollywood trainer Harley Pasternak, the actress raves, "I'm in the best shape I've ever been in."

Still, Heigl, one of PEOPLE's 100 Most Beautiful in 2007, didn't get there without putting up a fight. "I hate dieting. I hate the whole thing!" she tells PEOPLE in its new issue. A revealing love scene in Knocked Up gave her the motivation to hit the gym with L.A. trainer Pasternak, who is known for his intense, time-efficient workouts. "Katherine had a beautiful body, but it had never been toned," says Pasternak, who has worked with Halle Berry, Jessica Simpson and Sheryl Crow.

Heigl, 28, met with him for cardio and circuit-training sessions of 25 to 50 minutes, up to five times a week for six weeks prior to shooting. On-set, she'd jump rope or lift dumbbells outside her trailer. All the while, she ate Pasternak's 5-Factor Diet, which delivered five high-protein, high-fiber meals a day. Even with a scheduled weekly "cheat day," says Pasternak, Heigl soon looked "tighter and more toned."

Typical Workout for Heigl:
• 5 minutes of jump-roping, jogging, or stair-climbing for a cardio warm-up.

A circuit of 4 sets each of the following:
• 25 dumbbell flies
• 25 lunges
• 25 low-body crunches

Followed by:
• 5-25 minutes of cardio running, elliptical training, stair-climbing or biking, with the last five minutes working as a cool-down period.

Sample Day's Meals:
Breakfast: French toast with ricotta pillows
Mid-morning snack: A mixed-berry shake
Lunch: TexMex salad with chicken and black beans
Afternoon snack: Hummus crudite
Dinner: Sea Bass with brown rice and edamame