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. 

How intense does the strength training need to be? Are push ups and squats and using hand weights during your HIIT training enough or should it be a more classic free weight workout where you do 3 reps of 12? I eat well and work out 6 days per week (get healthy u TV, running, etc) for 30-60 minutes each day. Nothing is helping my weight loss and I'm so frustrated!
"One of the reasons that it's difficult to lose weight in your 40s is that you are beginning to lose muscle mass, so the composition of your body tissue changes," explains Keri Peterson, MD, Women's Health advisor. "Having higher muscle mass raises your metabolism, so your body burns more calories." So when you're dealing with the opposite—less muscle mass—that means a slower metabolism. Argh.
8. Sleep more and stress less. Easy, right?  This may be the hardest part.  There are plenty of things you can try.    Melatonin and or magnesium at night.  Massages.  Yoga.  Meditation.  Hot baths before bed.  Black out windows and cooler temperature in your bedroom.  A good shrink.  There’s really no shortage of suggestions.  It may be time to experiment if you’re not getting enough good sleep.
Changes in your activity levels are one of the main reasons that losing weight after 40 may be more challenging than before. Like many women, you may be putting others first and simply not finding time to exercise. You may also notice that your joints can no longer handle the same activities as before. However, a lack of exercise can lead to muscle loss and fat gain.
I am 59 and have been on a injury / weight gain cycle for several years. I have never been overweight till my first accident , then I gained weight and kept gaining and now that I am almost 60 , I want that great body and high energy back. The older I get the more problems my weight causes , legs hurt , falling asleep in my chair , I am too young for that. So I am eating better and boxing , which is a great workout . I plan to sky dive for my 60th next year.
People naturally lose muscle after 40, especially women after menopause. Because muscle burns more calories than fat, this can slow down your metabolism and make it harder to shake those stubborn pounds. Strength-training exercises -- lifting weights or doing body-weight exercises, like push-ups and squats -- at least twice a week can help you keep those muscles.
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