The smallest weighting, but often the reason a perfect diet week still doesn't feel amazing.
Chronic psychological stress keeps the immune system in a low, sustained state of alert — a well-established link in stress physiology research.
Morning light exposure supports circadian rhythm, which in turn regulates inflammatory and hormonal cycles.
Adequate hydration supports basic cellular and metabolic function — a simple, easily overlooked lever.
Strong social ties are consistently associated with better long-term health outcomes, including markers of inflammation.
Practices that lower perceived stress — meditation, breathwork, journaling — can measurably support recovery.
Why it's weighted lowest, not lightest. Stress and lifestyle factors are real, but harder to quantify precisely from self-report than food or sleep — so today they carry a smaller, more conservative weight in the model.
THE FAD