Tag: Knowledge recall

The nonconscious brain handles automatic behaviors, habits, and cravings—all below awareness. Research by Kahneman describes System 1 (fast, automatic, unlimited) versus System 2 (slow, deliberate, limited). Bargh’s work on automaticity shows most behavior originates nonconsciously. Your conscious mind thinks it’s deciding; mostly it’s rationalizing. Willpower pits a limited resource against an unlimited one. This companion covers the two systems, how this applies to eating, the willpower problem, why conscious decisions fail, working with the nonconscious, and implementation intentions. (4 min read)

Metabolic adaptation is the body’s response to chronic calorie restriction: lowered metabolic rate, decreased energy expenditure, increased hunger. Research by Zauner found resting energy expenditure actually increases during short-term fasting—the opposite of chronic restriction. Fothergill’s study of Biggest Loser contestants showed metabolic suppression persisting 6 years after weight loss. The key difference is hormonal: restriction signals scarcity; fasting signals temporary fuel switching. This companion covers the metabolic adaptation problem, the hormonal environments, why fasting differs, and practical implications. (4 min read)

The lipostat is the body’s fat-regulation system—a biological thermostat for body weight. When you lose weight, the lipostat increases hunger and decreases energy expenditure to push weight back up. Research by Fothergill on Biggest Loser contestants showed metabolic suppression persisting 6 years after weight loss. Rosenbaum and Leibel documented adaptive thermogenesis in humans. This companion covers the biological thermostat, how the lipostat defends against weight loss, the asymmetry problem, whether the set point can change, implications, and working with the lipostat. (4 min read)

The body compensates for exercise calories through increased hunger, reward eating, reduced non-exercise movement, and metabolic efficiency. Research by Pontzer found that above moderate activity levels, total daily energy expenditure plateaus—the body compensates for additional exercise. Studies show people typically compensate for 50-90% of exercise calories. This companion covers compensation mechanisms, the research reality, why this matters, the “outrun your diet” myth, what exercise actually does, and the practical approach. (4 min read)

During an extended fast, the body progresses through five metabolic stages: fed state (0-4 hours), early fasting (4-16 hours, liver glycogen), fasting state (16-24 hours, fat burning increasing), ketosis (24-72 hours, ketones as primary fuel), and deep ketosis (72+ hours, maximal fat oxidation). Research by Cahill and Longo documented these transitions. Understanding the stages removes mystery from fasting—your body has evolved mechanisms for each phase. This companion covers each stage in detail, what’s happening hormonally, how it feels, why this matters, and practical implications for different fasting lengths. (5 min read)

Your body maintains blood sugar during fasting through multiple mechanisms: the liver releases stored glucose (glycogenolysis), produces new glucose from non-carbohydrate sources (gluconeogenesis), and hormones like glucagon and cortisol regulate the process. Research by Cahill documented how humans remain functional through extended fasts because the body has evolved reliable systems to maintain glucose without eating. Blood sugar doesn’t crash—it’s carefully maintained. This companion covers the fear versus reality, the three mechanisms (glycogenolysis, gluconeogenesis, ketone adaptation), hormonal regulation, what “low blood sugar” actually means, and the irony of frequent eating. (5 min read)

Insulin sensitivity means your cells respond efficiently to insulin—a small amount effectively moves glucose into cells. Insulin resistance means more and more insulin is required to do the same job. You want sensitivity. Research by Sutton showed that early time-restricted feeding improves insulin sensitivity. Resistance promotes fat storage, blocks fat burning, and drives chronic hunger—a step toward type 2 diabetes. This companion covers what insulin does, the ideal of sensitivity, the problems of resistance, how resistance develops (chronic insulin exposure, excess fat, inactivity), and how to improve sensitivity through fasting, exercise, and dietary changes. (4 min read)

Adrenaline (epinephrine) increases during fasting. Research by Zauner found that resting energy expenditure actually increased during short-term fasting due to elevated norepinephrine. This is your body’s way of mobilizing energy stores—signaling fat cells to release fatty acids and keeping you alert to find food. Rather than making you tired, fasting often produces heightened alertness and stable energy. This companion covers the counter-intuitive reality of fasting energy, what happens hormonally during fasting, the evolutionary logic, the experience many report, and the metabolic effect on lipolysis and thermogenesis. (4 min read)

Whole foods trigger proportional reward—you eat, feel satisfied, stop. Processed foods trigger disproportionate reward—the signal is amplified beyond what calories warrant. Research by Hall showed people eating ultra-processed foods consume about 500 more calories daily than those eating whole foods, even when matched for nutrients. Processed foods combine fat, sugar, and salt in concentrations that don’t exist in nature, hitting the brain’s reward system harder than it evolved to handle. This companion covers reward system basics, how whole foods behave, how processed foods differ, the hyperpalatability factor, and why this knowledge helps. (4 min read)

The hypothalamus is the brain’s weight regulation center—a small region that integrates signals from hormones (insulin, leptin, ghrelin), nutrients, and the nervous system to control hunger, satiety, and energy expenditure. Research by Fothergill on Biggest Loser contestants showed metabolic rates suppressed by hundreds of calories daily—even years after dieting. The hypothalamus maintains a defended “set point” that fights weight loss through increased hunger and decreased metabolism. This companion covers the command center’s key players, hormonal inputs, set point defense, how the set point can change, and why hormonal approaches may succeed where calorie restriction fails. (4 min read)