Lose 10 Pounds in 10 Days: Jackie Warner Workout Secrets

"The key to fast weight loss is you have to increase your calories each 10-day phase," Warner said.

Warner explained what foods work best when trying to lose weight. "You have to have apples. They contain superstar ingredient pectin, major fat burner. Another one would be grapefruit. Also eat eggs. I suggest two whole eggs a day, which actually lowers cholesterol. Oatmeal for the fiber and chicken, which has tons of amino acids."

The trainer also highlighted the bad foods. "Get rid of all white flours, all white breads, white rice. All cookies, pretzels, crackers, croutons -- these are things to dump."

And of course, you need to exercise, which Warner said you must do every day. "You can make 20 minutes a very effective workout if you combine into supersets."

What's the biggest mistake people do when they start to diet and exercise? "They starve themselves," replied Warner. "When I train morbidly obese clients, the thread of commonality is they were all starving themselves and then they were so starving for dinner. They'd consume mindlessly eating 5,000-7,000 calories, and guess what, folks. It's not hard to do. Don't starve yourself."