However, the important takeaway here is this: The biggest factor in losing muscle is the lack of physical activity, which makes exercise a crucial component when it comes to preventing muscle loss. If you want to figure out the real deal, enter your information into a calculator to learn how many calories you really need for your age and activity level.
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.
Even if you’re eating reasonably well, you can still be in a calorie surplus. Whether you’re eating oversized portions, taking mindless bites while prepping family meals or grazing as part of a new work-from-home norm, all that noshing adds up. Tracking your food intake can be helpful. In one 24-week study, researchers found that time spent logging food intake was significantly linked to weight loss. If tracking your food (even with an app) sounds daunting, consider that by the end of the study, those who were still committed to tracking spent just 15 minutes a day doing it — about what you might spend scrolling through Facebook or Instagram.
Hormonal changes are one of the main reasons that women tend to lose more muscle as they approach menopause. Diet and exercise also play a role.12 On average, adults lose 3 to 8 percent muscle every decade after age 30.13,14 By the time you reach 80, you may have about 30 percent less muscle than you had at age 20.15,16 Muscle loss over time can lead to slower RMR, increased fat, weight gain, weakness, and fractures.17
As you reach mid-life, the pressures pile up. Just think of the typical stressors, like caring for kids and aging parents, facing financial burdens and dealing with the demands of a job. When you’re experiencing stress, your body responds by releasing the hormone cortisol. If your stress diminishes, your hormone levels return to normal, but if you’re experiencing ongoing stress from “adulting,” cortisol levels will remain high. This can set off a series of biological events that may lead to an increased appetite with more cravings and a propensity to store fat in your belly.
While quality zzz’s can become ever-elusive as you age from busy schedules, back pain, or menopausal symptoms like hot flashes or insomnia, getting enough sleep is an essential component to weight loss. A good night’s sleep actually burns calories! Plus, studies have shown a strong link between lack of sleep and over-eating the following day. This is because the hormones ghrelin and leptin are thrown out of whack when you don’t get enough sleep, leaving you feeling more hungry but less satiated at every meal, which leads to overeating.
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.
Oxidative stress occurs when the balance between free radicals in the body and our ability to fight against them is uneven, with free radicals prevailing. Free radicals can cause disease and there is an association with an increased risk of formation of free radicals as we age. That's why after a certain age, building up our defenses (through having lots of antioxidants in plants) can help reduce this imbalance and stack the cards in our defense system instead.

Focusing on being healthy means getting about 30 minutes of moderate exercise every day. This level of exercise can keep your heart healthy and work on things like lowering your cholesterol and/or blood pressure. This is a great place to start if you're getting into exercise after a long break. There's no reason you can't start here and progress to more intense goals as you build strength and endurance.


Difficulty sleeping can be a symptom of menopause, so it's not uncommon for women in their 40s to struggle with getting enough sleep. Unfortunately, this can also cause weight gain. "When you get less than seven hours of restful sleep, metabolic changes occur that can make it significantly harder to lose weight," says Palinksi-Wade. "The appetite hormone ghrelin is increased while leptin (which controls hunger cues) is reduced, triggering an increased desire to eat, especially for foods rich in fat and sugar. Insulin resistance increases, which can trigger the body to store fat."

Guys often wonder whether a dip in testosterone is at the root of their weight gain, says Dr. Stanford. "When men develop overweight and obesity, they tend to have a drop in testosterone that leads to a drop in energy and more retention of adipose tissue,” she says. The excess adipose tissue drives testosterone down. But taking testosterone isn’t usually the answer. “That’s not the underlying problem. Once we normalize the weight, the testosterone normalizes," she explains.


Yeah, you've probs heard that diet tip before—as it's wise for anyone trying to lose weight. Fried foods contain a whole lot of fat and contribute to weight gain—simple as that. But again, in your 40s, you deal with natural physiological changes that make it *even* tougher to shed excess weight, so overdoing it on fried foods has larger consequences. "A 20 year old can get away with eating empty calorie meals. A 40 year old usually cannot on a semi regular basis," Mirkin points out. "Until we are age 20, [our] bodies are building muscle. After age 20, it stops."
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.
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.
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