Your circadian rhythm isn’t guided only by light. Food timing tells your internal clocks when to be alert and when to wind down. When meals are irregular, or too heavy too late, your body receives mixed signals that can disrupt the natural evening drop in cortisol and the rising tide of melatonin. The way you structure your meals throughout the day has a powerful influence on your sleep at night. Blood sugar swings, skipped meals, and unbalanced macronutrients shift your hormonal rhythm, making it harder to fall asleep, stay asleep, or wake feeling restored.

Food sensitivities can contribute to chronic inflammation, which disrupts the communication between your gut, immune system, and brain, Over time, this ongoing inflammation can affect everything from your mood to your sleep to your overall well-being. Unlike a food allergy, which triggers an immediate and sometimes severe immune reaction, a food sensitivity creates a slower, more subtle inflammatory response. Certain foods—often ones eaten regularly—can irritate the intestinal lining, increase immune signaling, and release cytokines that circulate through the body and brain. The effects may appear hours or even days after eating, showing up as fatigue, joint pain, skin issues, anxiety, or poor sleep.