When you’re under-rested, your appetite-regulating hormones get short-circuited, so your appetite goes into overdrive, but the hormones that tell you you’re full don’t kick in promptly. Studies also suggest that when you’re sleep-deprived, it alters the way you think about food, so you have stronger cravings for sweets and other less healthful eats.
Hormone imbalance can also wreak havoc on your weight. Keep in mind that perimenopause and other hormone changes can start when you are in your 40s. Estrogen dominance will definitely interrupt weight loss but so will the imbalance of  cortisol, leptin and insulin. We have a great article that covers, in great detail, how these hormones affect your body. Check out Balance These 4 Hormones If You Want To Lose Weight for more information!
When you’re under-rested, your appetite-regulating hormones get short-circuited, so your appetite goes into overdrive, but the hormones that tell you you’re full don’t kick in promptly. Studies also suggest that when you’re sleep-deprived, it alters the way you think about food, so you have stronger cravings for sweets and other less healthful eats.
Before you try anything else, make sure there isn’t an underlying factor interfering with your weight loss, like a thyroid condition. Did you know that nearly 1 in 5 adults over 40 suffer from thyroid problems that can interfere with weight loss? Your thyroid is the main regulator of your body’s metabolism, so having an over or under-active thyroid gland (hyper or hypothyroidism) can truly interfere with weight loss. Talk to your doctor if you’re having trouble losing weight and also experiencing any of the following symptoms of a thyroid disorder:
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.

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.
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