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.

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.
At 41, these are the things that I notice the most. My body does not bounce back as easily as it once did and I have to work a lot harder to manage my weight. Genetics play a role in the aging process, but our lifestyle choices can help dictate how well our genes treat us as we get older. After turning 40, these are six of the top lifestyle habits to focus on.
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 eat healthy and exercise regularly and still can’t lose weight, your thyroid might not be working like it should. This happens in about 5% of people, and it's most common in women and people over 60. In addition to weight gain, it can also cause fatigue, joint or muscle pain, and depression. Medications can help, so get it checked if you think it might be an issue.
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