Tag: Knowledge recall

Fatty acid oxidation is the process of breaking down stored fat to produce energy — what “burning fat” actually means. Research by Anton on the metabolic switch shows this becomes primary when glucose is low: during fasting, prolonged exercise, or carbohydrate restriction. Insulin is the key regulator; when elevated, fat stays locked in cells. This companion covers beta-oxidation basics, when fat burning dominates, the insulin switch, ketone production, and building metabolic flexibility. (4 min read)

Cortisol follows a natural daily rhythm — rising before dawn, peaking in the morning around waking, declining through the day to a nocturnal low. Chronic stress flattens this pattern, blunting the morning surge and shrinking the difference between peak and trough. Dallman’s model describes a loop rather than a single push: elevated cortisol drives a pull toward comfort food, that eating lays down abdominal fat, and the fat in turn signals back to damp the stress hormones — which is what makes the cycle self-reinforcing. Separately, cortisol has been found to promote visceral fat storage directly, with central fat then…

Your brain uses 20% of your body’s energy — 400-500 calories daily — despite being only 2% of body weight. Research by George Cahill established that ketones can supply up to 60-70% of brain energy during fasting. The brain isn’t fragile; it evolved to function through food scarcity, shifting between glucose and ketones seamlessly. This companion covers the brain’s fuel sources, the blood sugar myth, cognitive performance during fasting, and why constant snacking isn’t necessary for brain function. (4 min read)

Hunger isn’t linear — it’s rhythmic. Research by Frecka and Mattes found ghrelin spikes occur at habitual meal times regardless of whether you’ve eaten — the hunger is real but clock-driven. When you skip a meal, ghrelin rises, peaks, then falls again. The body doesn’t escalate indefinitely. Additionally, as the body switches from glucose-burning to fat-burning, initial hunger often diminishes. Wait out a hunger spike during fasting and it passes in 20-30 minutes. This companion covers conditioned hunger, the metabolic transition, the 20-minute rule, and using the wave. (4 min read)

Total daily protein intake matters most, but timing has secondary effects. Research by Mamerow found subjects who distributed protein evenly across meals had 25% higher muscle protein synthesis than those who concentrated it at dinner — same total, different results. For muscle synthesis, younger adults maximize the response at roughly 20-30 grams of protein per meal (older adults need more). Spreading protein across meals may support muscle maintenance better than eating it all at once. This companion covers total intake, the muscle synthesis window, the breakfast problem, fasting considerations, and the aging factor. (4 min read)

More variety reliably leads to more eating. Research by Barbara Rolls on sensory-specific satiety shows you get “full” of one flavor but remain hungry for others. Participants ate 60% more with multiple courses than a single course of equal palatability. The buffet, the tasting menu, the holiday spread — all exploit this mechanism. This explains why simplified eating often succeeds where elaborate plans fail. This companion covers sensory-specific satiety science, why variety increases eating, the modern food environment, and using this knowledge. (4 min read)

Physical hunger builds gradually, can be satisfied by various foods, and stops when you’re full. Emotional hunger appears suddenly, craves specific comfort foods, and persists after eating, a clinical contrast rather than a validated test. Eating by internal cues is associated with better well-being, and the solutions to the two hungers differ entirely. Food satisfies physical hunger; it only masks emotional hunger. This companion covers physical and emotional hunger signs, the 1-10 hunger scale, distinguishing in the moment, and responding to each type. (6 min read)

Intermittent fasting and continuous calorie restriction both reduce calories, but timing matters. Research by Heilbronn and colleagues shows intermittent approaches preserve metabolic rate better — the body distinguishes between “temporary absence of food” and “chronic food scarcity.” Extended fasting periods allow insulin to drop, activate autophagy, and unlock fat stores. Eating less constantly keeps insulin present. This companion covers the insulin story, metabolic adaptation, autophagy, hormonal responses, and which approach fits your patterns. (4 min read)

Not all fat is equal. Subcutaneous fat you can pinch is relatively inert storage; visceral fat — deep abdominal fat surrounding the organs — is metabolically active, releasing inflammatory cytokines, raising free fatty acids, and driving insulin resistance and inflammation in the liver. It is best read as a marker that fat tissue is storing where it shouldn’t, rather than as a separate substance. Waist circumference predicts clinical outcome — diabetes especially — independent of BMI, which is why it tells you something the scale doesn’t. The good news: of all the fat on you, visceral is the depot that…

When cortisol stays chronically elevated from ongoing stress, it promotes fat storage specifically around the abdomen (visceral fat), increases appetite for calorie-dense foods, breaks down muscle, and impairs sleep. Research by Epel shows this creates a vicious cycle: stress → cortisol → belly fat → more stress. You can do everything right with diet and still struggle if chronic stress keeps cortisol elevated. This companion covers cortisol’s normal function, the chronic problem, and stress management as metabolic necessity. (5 min read)