After helping the men of the "Good Morning America" fitness challenge work on the Top 5 things that will age them, Dr. Mehmet Oz returned to "GMA" today with a little help for the ladies.
Call it tough love, but the "You: Being Beautiful" author did not pull any punches when he told the women why it was so important for them to stay in shape.
"Women are particularly challenging because women generally will not take care of themselves and not for the reason men give," he said. "Men don't take care of themselves because they've got other things going on. Women don't take care of themselves because of self- esteem issues."
"That sounds harsh, but it's actually true. We've looked at it in multiple studies. And you don't think of it in that way, but you're always willing to put others first, because that's what mothers think they need to do."
But Oz said this habit could be harmful, not just for women, but for their children.
"They're going to treat themselves the way you treat yourself," he said. "If they don't see you taking care of yourself, when they become your age, they will do the exact same thing to themselves."
To help women kick bad habits and get back in shape, Oz offered five simple tips.
Tip 1: Ease Up on the Stress to Control Eating
"When you have stress, you'll eat more and things you wouldn't normally eat," Oz said. "That's because we are hard-wired to equate stress to famine."
Oz suggested eating a small snack, like a handful of nuts, a half an hour before eating a meal so you're not starved when mealtime arrives.
Tip 2: Don't Just Count Calories, Count Exercise
According to Oz, good eating habits mean nothing if women don't have the muscle to back it up.
"If you don't have muscle mass you can't churn through calories. Remember, muscle, when it's being used, will burn 50 times more calories than fat will. So if you don't have muscle mass, you're never going to be able to keep the weight off, especially as you go through menopause," Oz said.
Women should optimally move 10,000 steps per day, or 20 minutes of exercise, just to keep the weight off.
During menopause, Oz said a woman's ovaries stop making estrogen as well as testosterone.
"No testosterone, no muscle. No muscle, you get a little pooch, and all of the sudden all the fat begins to accumulate. As you get older, that happens more and more frequently," he said.
Tip 3: Sleep Is the Key to Building Muscle
"Of all the things in my own personal life that I do that I treasure the most it's to sleep because it is the best way for us to generate growth hormone, and without that we can't build the muscle mass," Oz said.
Along with sleep, Oz said most women have problems building muscle mass because they "don't work at it."
"I'm not talking about being a big muscle-bound weightlifter. I'm talking about developing programs that allow you to build that lean muscle, that churns through the calories and gives you a look that you want to have," he said.
If you don't have access to a gym, Oz said lifting your own body weight can be a good workout.
Also, women should "rev your engines" often.
"The body is designed to, to be sped up a little bit. What I'm talking about, literally, is you have to at some point every week run as fast as you can run, jump as high as you can jump," Oz explained. "You have to push the system and to get your heart rate up, to push the muscle mass, to stretch your limbs out. Do the things you did as a child, and continue to do them into the adulthood and you'll keep the hormones where they need to be."
Tip 4: Forgive Yourself for Mistakes and Learn to Feel Better
"Listen, when you're driving along on the road and you missed your turn, the GPS doesn't berate you. Right? It says at the next available moment, make an authorized U-turn. What's the big deal? The whole purpose of this is not to be healthier, it's to feel better," Oz said.
Forgiving mistakes and fixing habits can keep Americans healthier, like our European counterparts.
"We cost twice as much to take care of as the average European per person," Oz said. "And we're twice as sick as the average European. That's why we cost as much. So if we address these where it matters, not to prevent disease, but to live better today."
Tip 5: Make Long-Term Changes You Can Sustain
"None of this is a wind sprint," Oz said. He said there's no real benefit for people to eat what they hate to eat for the short term.
"Don't deprive yourself. And you will automatically go back to your playing weight," he said. "You will only stay there if you build the muscle mass, but at least it's a head start."
"And that's really what this is all about. Pura vida, pure life."
Get more expert advice on nutrition, fitness, weight loss, sleep and relaxation at the ABCNews.com OnCall+ Wellness Center.