As we age, our metabolism slows and the rate at which we break down food decreases by 10 percent each decade after age 20. Metabolism is the amount of energy (calories) your body uses to maintain itself.

At what age does fast metabolism slow down?

Researchers found that metabolism peaks around age 1, when babies burn calories 50 percent faster than adults, and then gradually declines roughly 3 percent a year until around age 20.

What time of day is metabolism slowest?

They discovered that metabolic rate was lowest late during their biological “night,” and highest around 12 hours later, in the biological “afternoon and evening.”