Many people notice the same thing in their 40s. Habits that used to keep weight steady stop working as well, and new weight tends to settle around the middle. This is common, it has real biological reasons, and it says nothing about willpower.
It is also worth understanding for health reasons, not appearance. Belly fat includes visceral fat, which sits deeper inside and wraps around the organs. Cleveland Clinic notes that some visceral fat is normal and protective, but research links too much of it to a higher risk of heart and blood vessel disease.
This article is for education and is not medical advice. Talk with a licensed provider about your health. Talk to us
Why is it harder to lose weight after 40?
Part of the answer is muscle. Cleveland Clinic explains that people gradually begin losing muscle mass and strength in their 30s or 40s, and that the loss speeds up between 65 and 80. Muscle helps the body use energy, and changes in testosterone and other hormones play a role in that loss.
The National Institute on Aging (NIA) adds that metabolism, meaning how the body gets energy from food, can change with age, so some people need to be more active or eat less to keep the same weight. It also makes a point worth remembering: the scale only tells part of the story, and a person at a normal weight can still carry more fat and less muscle than someone slightly heavier.
Causes of belly fat after menopause
During the menopause transition, the body begins to use energy differently. The NIA notes that fat distribution changes, weight can come on more easily, and the waist may get larger as muscle is lost and fat is gained. Cleveland Clinic adds that the hormone shift of perimenopause slows metabolism, and that weight gain is very common as estrogen falls.
This is a normal part of the transition rather than a failure of effort. The Menopause Society notes that weight gain around menopause can be prevented with diet and exercise, and that even a small loss brings health benefits. More on the transition itself is in perimenopause symptoms nobody warns you about.
Causes of belly fat in men, and does belly fat lower testosterone?
For men, testosterone is part of the picture, and the relationship runs both ways. Cleveland Clinic notes that testosterone can fall about 1% a year from the late 30s, and that more body fat is one of the signs of low testosterone.
At the same time, obesity and diabetes are among the most common causes of low testosterone, and the kind that starts later in life is more common in men with type 2 diabetes, overweight or obesity. So belly fat can lower testosterone, and low testosterone can make it easier to gain fat. The signs to look for are in signs of low testosterone men often miss.
Stress, sleep and alcohol
Daily life feeds into visceral fat more than people expect. Cleveland Clinic notes that:
- Cortisol, the stress hormone, makes the body add to its store of visceral fat
- Too little sleep puts stress on the body and can make visceral fat build up or harder to lose
- Alcohol adds calories with little nutrition and puts strain on the liver, which processes fat
- Being less active means storing more visceral fat than the body uses for energy
Less often, a medical condition is involved. An underactive thyroid slows metabolism and can cause weight gain, and Cushing's syndrome, which is rare, causes weight gain in the face and belly.
What helps
Cleveland Clinic says visceral fat responds to the same habits that lower body fat in general, and that it is actually easier to lose than the fat just under the skin. The habits it lists:
- Regular activity. The CDC recommends at least 150 minutes of moderate activity a week, such as 30 minutes on five days, plus muscle strengthening on at least two days.
- An eating pattern you can keep, such as the Mediterranean or DASH style of eating.
- Enough good sleep.
- Ways to manage stress.
- Less alcohol.
Strength work deserves special mention after 40. Cleveland Clinic notes that the right exercise and nutrition plan can slow, or even reverse, the effects of age related muscle loss.
Small changes count. The Menopause Society notes that losing as little as 3% of body weight can improve cholesterol and lower the risk of diabetes, with further benefits at 5 to 10%. The NIA recommends talking with a doctor before setting out to lose or gain weight.
What a week of activity can look like
Moderate activity30 minutes on five days, 150 minutes in all
Muscle strengtheningAt least two days
When to get checked
Talk with a provider if:
- Your weight or waist has changed quickly without a clear reason
- Weight gain comes with tiredness, feeling cold or dry skin, which can point to the thyroid
- You are a man with a lower sex drive or changes in erections as well
- You have made steady changes for months and nothing has moved
Waist size is one simple measure providers use. Cleveland Clinic lists 35 inches or more for women and 40 inches or more for men as the point where visceral fat is linked to health risk. It is a number to discuss with a provider, not a verdict.
