Menopause and Weight Gain: Understanding your New BMI

FastBMI Medical Editorial

Review of hormonal changes and metabolic health.

The transition to menopause (perimenopause and menopause) is accompanied by a cascade of hormonal changes that directly affect body composition. Many women discover that their usual strategies to maintain a healthy BMI stop working.

The role of estrogens in body fat

Estrogens help regulate metabolism and control where fat is stored. When their levels drop during menopause, the basal metabolism tends to slow down. Furthermore, the body changes its fat storage pattern: instead of depositing in the hips and thighs, it redistributes towards the abdomen (visceral fat).

Keep in mind: An increase in abdominal circumference, even with a normal BMI, increases cardiovascular risk. That's why, in menopause, measuring your waist is as important as measuring your weight.

Why your BMI changes and how to adapt

Slower metabolism: You burn fewer calories at rest. To maintain your previous weight, you would need to reduce caloric intake or increase exercise.
Sleep problems: Hot flashes interrupt sleep, which elevates cortisol (stress hormone) and insulin, promoting fat storage.
Insulin resistance: Hormonal changes make cells less sensitive to insulin, facilitating weight gain.

Should I worry about a slightly high BMI?

As we approach old age, science suggests that a slightly higher BMI (25-27) could offer certain bone and energy protections. The focus should not be on having a BMI of 21 at age 55, but on having excellent muscle mass, strength, and a healthy heart.

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