Tag: Knowledge recall

Fatty acid oxidation is the process of breaking down stored fat to produce energy, which is what “burning fat” actually means. It becomes the primary fuel path when glucose runs low: typically 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, central fat and cortisol reactivity travel together, though the authors conclude only that cortisol may contribute…

Your brain uses about 20% of the body’s glucose-derived energy despite being only 2% of its weight. It can run on ketones as well as glucose, and in prolonged fasting ketones become its predominant fuel. The often-quoted “60-70% of brain energy” figure deserves its footnote: it is a derivation from the founding paper rather than a number that paper states, its subjects were three obese patients at five to six weeks of therapeutic starvation, and five to six weeks is not a few days. The direction holds regardless: the brain has backup fuel for long stretches without food. This companion…

Hunger isn’t linear: it’s rhythmic. In fasting subjects ghrelin rises and falls at customary meal times with no food involved, so the hunger is real, and it is keeping its own schedule. 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 the hormone behind it falls again, though the twenty-to-thirty-minute figure often quoted for this is not a sourced one; what there is is a ghrelin curve from six people, falling after…

Total daily protein intake matters most, but timing has secondary effects. Research by Mamerow fed eight adults both patterns in turn and found even distribution gave about 25% higher 24-hour muscle protein synthesis than concentrating it at dinner: same total, different results. For muscle synthesis, research identifies benefits to at least 20-30 grams of protein per meal (older adults may need more per kilogram of body weight). 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.…

More variety goes with more eating. Research by Barbara Rolls on sensory-specific satiety shows you get “full” of one food but remain hungry for others. Variety raises total intake: in one set of experiments, people ate a third more when sandwiches came with four fillings rather than one. The buffet, the tasting menu, the holiday spread: all put this mechanism to work. This may help explain why simplified eating can work where elaborate plans don’t. This companion covers sensory-specific satiety science, why variety increases eating, the modern food environment, and using this knowledge. (5 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. 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. Two findings sit side by side rather than a head-to-head trial: short-term fasting does not lower resting metabolic rate, while chronic restriction can. On the carbohydrate-insulin model, fasting gaps let insulin drop and stored fat come into use, an argued account rather than a settled one; autophagy rises with fasting in animal work. 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, the 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 lifestyle change moves…

Chronic stress does not simply hold cortisol high: it appears to flatten the daily curve, which can mean a low morning as much as a high evening. What is measured is a difference in reactivity: women already carrying central fat secrete more cortisol under stress, and the design cannot say which came first. The link from cortisol to belly fat is a well-argued proposal rather than a demonstrated mechanism, and the association with adiposity is real and small. This companion covers cortisol’s normal function, what chronic stress actually does to it, and stress management as metabolic necessity. (6 min read)