According to a report from W.H.O and global health research
Female hormones typically decline by about 15% every 10 years or so. The rate of decline peaks from age 40 onwards; By age 50, it is estimated that women's hormones are only about 10% compared to those in their twenties. ESPECIALLY, weight gain, especially fat accumulation in the abdomen, thighs, and arms. This erratic decrease causes menstrual disorders, hot flashes, dryness, decreased libido, mood changes, dry skin, and dark spots.
Between the ages of 20 and 50, women usually gain about 11 kg, but at menopause, their weight increases suddenly and sometimes uncontrollably.