We gain weight in middle age not because of hormonal shifts, or metabolic decline, it is because we are moving less. By analyzing data from nearly 6,500 people ranging in age from infancy to elderly, a recent study published in Science determined that resting metabolism holds steady from age 20 to 60 before logging a decrease of less than 1% per year thereafter. Further countering conventional wisdom, the paper cites no real differences between resting metabolic rates of men and women, even for menopausal women, when controlling for other influences. The solution: move more and move in the correct way, according to a new paper published in Science. Take up strength training and HIIT training.
Study cited: https://www.science.org/doi/10.1126/science.abe5017