All you need to remember for this diet plan is the number 5, says Harley Pasternak, trainer to the stars and author of The 5 Factor Diet.

Eat five meals per day, advises the most sought-after trainer among celebrities. Besides three main meals, have two substantial snacks so you never get hungry. Also, try to include these five components in every meal.

• A lean protein, such as chicken, fish, or egg whites.

• Filling carbs, like sweet potatoes, beans, brown rice, or oatmeal.

• Healthy fats. Try olive oil or nuts.

• Five grams of fiber, best obtained through fruit, vegetables, or whole grains.

• A sugar-free beverage. Water, tea, coffee, an unsweetened energy drink, or diet soda all count.
  

And finally, exercise five days per week. Strive for 25 minutes on a treadmill, take a Pilates class, or power walk with a friend.