Your metabolic rate naturally continues to decline 5 percent each decade once you hit 40.3 Your resting metabolic rate (RMR) determines how many calories you just to survive. It is determined by a variety of chemical reactions inside your body. These reactions rely on your mitochondrial function and sodium-potassium pumps. Your mitochondria help to create energy, while your sodium-potassium pumps generate muscle contractions and nerve impulses.4,5,6,7,8 Both of these processes become less effective over the years and slow your metabolism.9,10 If you eat more than your RMR yet lead a sedentary life, you set yourself up for weight gain.
What does that mean for you? That the weight loss process naturally becomes harder as you get older...that's just a fact and accepting it means you can stop punishing yourself or feeling ashamed about your body. Instead of focusing on the negative, focus on the things you can control: Your workouts, activity levels, diet, stress management, sleep management and, most important, your attitude.

“To achieve and maintain a healthy weight as we age, it’s imperative that we incorporate a ‘movement portfolio’ into our daily lives,” said Kushner. He explained that your portfolio should include activities of daily living (like walking, using the stairs and house cleaning), active fitness activities (like bike riding and using the elliptical machine) and resistance-training exercises. Kushner also recommended trying to reduce the time you spend doing sedentary activities like watching TV. “These targeted action steps will boost metabolism and help maintain muscle mass,” he said.
“There are many eating patterns that can be used to lose weight,” says William Samuel Yancy, M.D., director of the Duke Diet and Fitness Center and associate professor of medicine at Duke University. Many have evidence behind them, whether that’s keto, Paleo, Mediterranean, vegan, or anything else. Interestingly, there’s not as much research on what works for men as there is on women, but “for men, sometimes it’s as simple as shortening the time in which you are eating to an 8- to 10-hour window a day,” says Kristin Kirkpatrick, R.D.N., consultant for Integrative and Lifestyle Medicine for the Cleveland Clinic. Even something as straightforward as not eating after 6 PM can make a big difference—one of her male clients who lost 150 pounds found that to be especially helpful, she says.
“To achieve and maintain a healthy weight as we age, it’s imperative that we incorporate a ‘movement portfolio’ into our daily lives,” said Kushner. He explained that your portfolio should include activities of daily living (like walking, using the stairs and house cleaning), active fitness activities (like bike riding and using the elliptical machine) and resistance-training exercises. Kushner also recommended trying to reduce the time you spend doing sedentary activities like watching TV. “These targeted action steps will boost metabolism and help maintain muscle mass,” he said.
This is a great article. I appreciate all this insight and help as hitting 40 a few years ago was a shock to my body for sure. I would also add to your stress reducing ideas to spend some time reading the Psalms in the Bible. The God who created you longs to take your burdens and teach you how to stop trying to solve all your problems on your own. He is there to show you the way to stress reduction and a while new/better way of doing life. If you don’t know God or how you can start a personal 1-on-1 relationship with Him, check out some of these helpful apps in the App Store: Knowing God Personally (by Power to Change), God Tools (by Cru), Life Conversation Guide (by North American Mission Board), or talk to a pastor at a local Christian church in your neighborhood. My rule of thumb is that while working to take care of my physical body throughout my lifetime, I never want to neglect my soul that will continue on for all eternity.
“Instead of eating less of everything and feeling deprived, you want to replace more calorie-dense foods, such as fried foods, high-fat meats, cookies, cakes, candies (and) chips, with nutrient-rich, less calorie-dense foods, such as vegetables, fruits, salads, bean dishes, broth-based soups and whole grains like oatmeal,” said Kushner, adding that the high water and fiber content of foods like these increase their volume, making them more satisfying for fewer calories.

Let's get down to business: If you're having a hard time achieving your weight-loss goals after 40, these 16 expert-backed tips for losing weight in your 40s are totally doable and can nudge your body in the right direction again. (And, tbh, they're wise for anyone looking to move the needle to keep in mind—not just those over 40.) You'll be on your way to a stronger, healthier you in no time.
What does that mean for you? That the weight loss process naturally becomes harder as you get older...that's just a fact and accepting it means you can stop punishing yourself or feeling ashamed about your body. Instead of focusing on the negative, focus on the things you can control: Your workouts, activity levels, diet, stress management, sleep management and, most important, your attitude.
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