Your light environment might be more important than your diet… and almost no one pays attention to it. Your body runs on a circadian rhythm that is controlled primarily by light exposure, not your watch. Morning sunlight tells your brain: “Start cortisol, increase alertness, set the timer for melatonin later.” Artificial light at night does the opposite: It delays melatonin, disrupts sleep cycles, and throws off hormone timing. You can eat perfectly… but if your light signals are off, your biology is out of sync.