As a woman, once you cross the age of 40, there are many physiological changes that start taking place which go beyond your control, even when your diet and lifestyle remain the same. This midlife weight gain is common and often linked to hormonal changes, slower metabolism, and lifestyle shifts that occur during perimenopause and menopause. According to Dr. Anshuman Kaushal, Robotic GI Surgeon, understanding the real reasons behind this change can help women manage their health more effectively.
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Here are five surprising reasons why women gain weight after 40, according to Dr. Kaushal.
One of the biggest factors behind weight gain after 40 is the hormonal transition known as perimenopause, the phase leading up to menopause. During this period, levels of estrogen and progesterone fluctuate and eventually decline.
Estrogen plays a key role in regulating body weight, metabolism, and fat distribution. As estrogen drops, the body tends to store more fat around the abdomen rather than the hips and thighs. “During perimenopause, estrogen just doesn’t drop steadily. It swings up and down. One day it’s high, the next it crashes,” Dr. Kaushal said onInstagram. This is why many women notice the sudden appearance of stubborn belly fat, even if their eating habits remain unchanged.
Another major reason is a natural slowdown in metabolism. As you age, your body burns fewer calories at rest. This means the same diet that once maintained weight may now lead to gradual fat gain. “The solution is not a starvation diet, but building resistance,” said Dr. Kaushal. “You need to increase protein intake and regulate your sleep,” he added.
Studies show that metabolism slows partly because muscle mass declines with age, making it harder for the body to burn calories efficiently. Even small calorie surpluses over time can result in noticeable weight gain.
The solution for slow metabolism is not a starvation diet, but building resistance
After you turn 30, muscle mass begins to decline at a rate of 3 to 8 per cent every decade, and this process accelerates during midlife. Muscle burns more calories than fat, so losing muscle lowers the body’s metabolic rate. As muscle decreases and fat increases, women may experience changes in body composition - even if the number on the scale does not change dramatically.
This is why strength training becomes especially important after 40.
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