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.
Starting in your 30s, you can lose three to five percent of your muscle mass each decade if you don’t stay active. Note the last part of that point: “If you don’t stay active.” As you get older, "there's a lot of competition for your time and energy," says Dr. Yancy. For some men, that can push exercise out of the picture. But it doesn't take heroic efforts to put it back into your life.
To jumpstart your weight loss, the biggest focus should be to develop habits that will help you build or maintain your muscle mass. "The most effective way that women over 40 can boost their metabolism is by building muscle through weight-lifting and resistance training," says Dr. Peterson (more on that to come). But nutrition and sleep habits also play a role here.
If you are taking the appropriate measures (e.g., eating enough of a calorie deficit for your age and body composition, stressing less, and working on strength training) and still not losing weight, and you also have other symptoms of hypothyroidism (such as constipation, fatigue, dry hair and nails), then it may be worth considering getting your thyroid levels checked," advises Dr. Peterson.
One of the main culprits for weight gain is, of course, our hormones, which start to change right around the mid-30s and into the 40s. This change in hormones, less estrogen for women and less testosterone for men, cause the fat in our bodies fat to shift to the middle of the body while abandoning other areas of the body you could care less about. That's one reason you may get a little fluffier around the middle while other parts of you actually get smaller.

Your muscles are important for bone density, strength, and overall health. However, your body starts to lose muscle as you age. Building muscle can increase your metabolism and help you burn more calories at rest. Muscle also takes up less space than fat, so you can feel leaner and toned as you increase your muscle mass. Good options to increase your muscle mass include light weightlifting, body weight exercises, and Pilates.


It’s no secret that losing weight after 40 can be difficult for some women. As you age, you begin to lose muscle mass, causing your metabolism to slow down. Add to the slow metabolism a dose of wildly fluctuating hormones and you have the perfect recipe for weight gain. Weight gain after 40 no longer translates into only a tight-fitting pair of pants. You are now at increased risks for a wide range of diseases, including depression, high blood pressure, and diabetes.
If you prefer a specific plan with specific rules, make sure it goes with your lifestyle, which, for most guys, gets increasingly complicated in your 40s with more responsibilities at work, with your family, and maybe even with your aging parents. A vegan diet can be hard to do in a healthy way if you live a grab-and-go existence. Meal prep is going to be a challenge if you’re never home long enough to cook. Don’t just pick what worked for a friend; pick what’s likely to work with your busy, over-40 lifestyle.
Amy Myers, MD is a two-time New York Times bestselling author and an internationally acclaimed functional medicine physician. Dr. Myers specializes in empowering those with autoimmune, thyroid, and digestive issues to reverse their conditions and take back their health. In addition, she is a wife, mother, and the successful founder and CEO of Amy Myers MD®.
Between desk jobs, commutes, and family activities, many 40-somethings don’t have a lot of free time to work out. But it’s important -- for your weight and your overall health -- to fit in at least 2 1/2 hours of moderate physical activity (like brisk walking or light yard work) every week. Pencil times in to your calendar, and make them a priority.
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