Five Do's: Vegetables, lean proteins, fruits, whole grains and water.
Five Don'ts: Soda, salt, white flour products, fried foods and sweets.
One of the keys to keeping the metabolism up is sleep, according to Dr. Kelly Machesky, of St. John Providence.
"It helps the body recharge, regroup," she said. "Target about seven hours a night."
Another tip is the amount of exercise we get.
"If you can start with an activity that is engaging to you," Machesky said. "It should be an activity you love to do. A target should be work toward 30 minutes five days out of the week."
She added that when it comes to foods that help you loose weight, concentrate on lean proteins and vegetables.
"They are foods that get your metabolic rate going in the right direction," she said. "Lean proteins like lean meats, beans, dairy, eggs."
Beside water, a little bit of caffeine doesn't hurt, either.
"It is a way to naturally boost your metabolic rate," she said. "The caffeine coming from green tea in particular. But it can be from something that's appealing to you."
The 21-Day Challenge wraps up with FOX 2's Healthy Heart Project from St. John Providence this weekend. The free screenings will be held from 7 to 10 a.m. on Saturday, April 18.
Two locations will host: St. John Hospital and Medical Center in Detroit and Providence Hospital in Southfield.