Sleep deprivation and stress boost hunger hormones while weakening willpower, making late-night food choices driven by emotion rather than logic. Dr. Mark Hyman challenges dairy myths—modern milk contains 60+ hormones and lacks proven benefits for bone health—and explains why fasting windows of 12-14 hours activate cellular repair and longevity pathways that processed foods continuously suppress. Willpower fails during hunger because the prefrontal cortex deactivates while the amygdala (emotional brain) becomes hyperactive, especially late at night when stress and sleep deprivation spike cortisol and ghrelin.