The Best Time of Day to Exercise for Metabolic Health – The New York Times

“Evening exercise may be more potent than morning workouts for improving metabolic health, according to a helpful new study of exercise timing. The study, which looked at high-fat diets and overweight men, found that late-day workouts moderated the undesirable health effects of a greasy diet, while morning exercise did not.

The study involved only men who were eating a fatty diet, but adds to growing evidence that exercise timing matters and, for many of us, working out later might have particular advantages.

Although we may be only dimly aware of this, operations inside our bodies follow busy, intricate and mutable circadian schedules. All of our tissues contain molecular clocks that coordinate biological systems, prompting our blood sugar to rise and dip throughout the day, along with our hunger, heart rates, body temperature, sleepiness, gene expression, muscle strength, cell division, energy expenditure and other processes.  . . . “