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.

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.
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.

Remember how we said that the more muscle you have on your body, the better your metabolism works? Having more muscle increases your resting metabolic rate (RMR). This helps you burn more calories at rest—which is what you want if you’re aiming for weight loss after 40. So if you’ve been avoiding those weight machines or dumbbells, now’s the time to dedicate yourself to strength training. It is never too late to start strength training! If it is new to you, take advantage of any free personal training sessions that might be offered when you join a local gym or health club. This is often to familiarize you with the equipment and the layout of the facility, but can be a useful tool to get you started on a routine. Of course, if you have the finances to hire a trainer for a few sessions that’s another way to go.
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.
Protein is incredibly important in repairing your tissues, building muscles, combating fat, balancing your hormones, and increasing your overall health and well-being.29 Healthy proteins include grass-fed beef, pork, lamb, organic pasture-raised poultry, wild-caught fish, and wild game. I purchase my meats from ButcherBox and my fish from Vital Choice. I drink a delicious smoothie using The Myers Way® Paleo Protein to meet my protein needs. It’s organic, gluten-free, sugar-free, dairy-free and sourced from non-GMO, hormone and antibiotic free, grass-fed beef with 21 grams of protein per serving. My new, limited-time-only Salted Caramel flavor has just released. It’s a great summertime treat that ups your protein without weighing you down with sugars.
That delicious plate you just bought or cooked up might temp you to gobble it up in just a few bites, but that's probably not a good idea, says Palinski-Wade. "Eating slowly, eliminating distractions at meals, and even putting your fork down in between bites all allow you to get in touch with your body’s satiety signals and to stop eating when satisfied."
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.
Why that’s so important: “The more muscle we have, the more calories we burn,” Kirkpatrick says. Even if it doesn't actually help you lose weight, it can help keep you from gaining it—along with all the other good things it does for your body, mind, and life. Lots of over-40 guys like HIIT, since its compressed timeframe ends up having a low impact on your schedule.
If you're genetically predisposed to gain weight easily, that may be another strike against you. Even if you don't actually gain weight, you may still gain inches around the waist. This weight gain can be so frustrating, it's easy to become obsessed with losing it, starving yourself or exercising too much or maybe even looking into the latest plastic surgery procedure.
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