Your metabolic rate naturally continues to decline 5 percent each decade once you hit 40.3 Your resting metabolic rate (RMR) determines how many calories you just to survive. It is determined by a variety of chemical reactions inside your body. These reactions rely on your mitochondrial function and sodium-potassium pumps. Your mitochondria help to create energy, while your sodium-potassium pumps generate muscle contractions and nerve impulses.4,5,6,7,8 Both of these processes become less effective over the years and slow your metabolism.9,10 If you eat more than your RMR yet lead a sedentary life, you set yourself up for weight gain.
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.

When you were young, you probably didn't spend too much time thinking about preparing your body for the future. In your teens and twenties, you're in peak condition and it's the perfect time to start exercising. Cut to 20 years later and, if you didn't start exercising, you probably wish you had since there's something we all start to experience in our 40's—weight gain.
Developing good sleeping habits is crucial when it comes to weight loss.40 The exercise and dietary tips with discussed earlier can support your sleep cycle. Avoid sugary and caffeinated foods, especially as the evening approaches, so you can feel tired and calm, instead of jittery. Limit blue-light exposure in the evening by wearing amber glasses that block harmful wavelengths from electronics. Develop a night-time routine that calms you down before bedtime.
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.

“There are many eating patterns that can be used to lose weight,” says William Samuel Yancy, M.D., director of the Duke Diet and Fitness Center and associate professor of medicine at Duke University. Many have evidence behind them, whether that’s keto, Paleo, Mediterranean, vegan, or anything else. Interestingly, there’s not as much research on what works for men as there is on women, but “for men, sometimes it’s as simple as shortening the time in which you are eating to an 8- to 10-hour window a day,” says Kristin Kirkpatrick, R.D.N., consultant for Integrative and Lifestyle Medicine for the Cleveland Clinic. Even something as straightforward as not eating after 6 PM can make a big difference—one of her male clients who lost 150 pounds found that to be especially helpful, she says.
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.
Pay attention to what you are eating. Read labels and ensure your foods are organic, nutrient-dense, and anti-inflammatory. Avoid eating in front of the TV, while standing up, and when busy with other tasks. Keep a regular eating schedule. If you are craving something, check-in with yourself to see if you are truly hungry or just thirsty, stressed, or bored.

Eating well isn’t just about skipping out on processed junk food. It’s also about filling up your plate with clean, healthy foods that can actually assist in your weight loss. Healthy fats like those found in olive oil, avocados and nut butters nourish your body while helping you feel full longer—which means you’re less likely to overeat. Incorporating healthy sources of protein like eggs and salmon will also help you feel more satiated as well as fuel the muscles you’re building through that regular strength training we mentioned above! Hungry during the day? Keep a small pack of heatlhy almonds or other nuts in your bag to snack on in a pinch.  Just a handful will keep you satisfied until your next meal, all while providing healthy protein, fat and fiber. Don’t wait until you’re tummy is growling! Be prepared.
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.
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