Eating for Better Sleep & Foods that Improve Metabolic Health | Dr. Marie-Pierre St-Onge

Sleep loss isn’t just about feeling tired—it rewires your body’s hunger signals in sex-specific ways, with men gaining appetite from elevated ghrelin and women losing satiety from plummeting GLP-1, leading to an average 300 extra calories consumed daily. Dr. Marie-Pierre St-Onge’s research reveals that even six weeks of consistently sleeping just six hours a night triggers insulin resistance and elevated blood pressure, independent of calorie intake, proving that metabolic health is shaped more by sleep quality and timing than by sheer sleep duration. The real breakthrough? What you eat directly determines how well you sleep, and how well you sleep dictates what you eat—creating a self-reinforcing cycle that can either sabotage or supercharge your health. By shifting the majority of your daily calories to the first two-thirds of your waking hours, you boost fat oxidation, improve sleep architecture, and reduce nighttime metabolic disruption. Contrary to popular belief, the issue isn’t just about avoiding sugar or fat—it’s about the timing of intake, the quality of food, and the hidden influence of food engineering, like the deliberately sweeter U.S. yogurt that masks metabolic harm. Even industry-funded studies, when transparent, can yield valuable insights—such as a Frito-Lay-backed trial showing corn oil-fried chips improved lipid profiles—though the scientific literature remains skewed by the near-impossibility of publishing null results.