Tag: Knowledge recall

Ketones are molecules produced by the liver when fat is broken down, your body’s backup fuel system. Production begins as glycogen depletes, and the switch is a range rather than a number: roughly twelve to thirty-six hours, depending on your starting stores and your activity. Cahill’s review of fuel metabolism in starvation documented ketones fueling most tissues including, crucially, the brain, which comes to draw most of its energy from them, measured after weeks without food, not after one long night. This companion covers what ketones are, how the transition is paced, what ketones can and cannot fuel, and what…

Liquid calories are compensated for poorly: you can drink hundreds of calories and still eat as much later. Research by DiMeglio and Mattes showed people who consumed liquid carbs didn’t reduce subsequent food intake; solid calories did. Why is not settled: the studies disagree about whether hunger changes. A daily pattern of juice, sweetened coffee, soda, and wine adds up fast, and that is arithmetic off the labels rather than an independently sourced figure. This companion explores the missing satiety signal, common liquid calorie sources (some “healthy” smoothies run to several hundred calories), and the simple rule: drink for hydration,…

Glycogen, stored glucose in liver and muscles, provides roughly a day of energy: about 2,400 calories, arithmetic on storage weights that are themselves averages with wide ranges behind them. The timing that is established is a range, not a number: twelve to thirty-six hours to the switch, depending on starting stores and activity. Once depleted, the body shifts to fat-burning: breaking down fat into fatty acids and ketones. This companion explores what glycogen is, the hour-by-hour timeline of a fast, why the first 24 hours feel different from later fasting, and the water weight connection (glycogen is commonly said to…

The Minnesota Starvation Experiment involved continuous severe calorie restriction: thirty-six men volunteered, thirty-two completed six months on an average of about 1,570 calories a day, with severe physical and psychological effects. Intermittent fasting is argued to produce different outcomes because the body responds differently to “not eating” versus “eating but not enough,” though the trials put it level with ordinary dieting. Fasting triggers hormonal shifts: increased growth hormone, and resting metabolism that holds up over the first day or two, though how long that lasts is less settled than usually stated. This companion explores the experiment, why fasting is different…

All diets work short-term because restricting intake draws on body reserves. They tend to fail long-term, and biology is one reason: restriction sets off metabolic slowdown, rising hunger hormones, and a body defending against weight loss. Research on Biggest Loser contestants showed metabolic rates stayed suppressed years later. The diet ends but the adaptations persist, and most of the lost weight usually comes back. This companion explores initial success, metabolic pushback, the set point problem, and what one contested account points to instead: hormonal drivers of weight rather than intake alone. (5 min read)

When researchers praised the Mediterranean diet of Crete, they documented the olive oil, fish, and vegetables, but largely overlooked that Greek Orthodox Christians fasted roughly 180 days annually. Sarri measured what those fasts did: total cholesterol 12.5% lower, LDL 15.9% lower, BMI 1.5% lower. But the same study found the mechanism was dietary, with fat falling from 38% to 32% of energy and fiber rising 43% during the fasts, and the gains partially rebounded afterwards. The missed variable is real and it is not the one usually claimed. This companion explores what the Seven Countries Study did not capture, what…

“Hyperpalatable” foods combine sugar, fat, and salt in proportions one paper defines by nutrient threshold, combinations its authors say may facilitate overconsumption despite satiety. Fazzino and colleagues defined three key combinations by nutrient thresholds. They are associated with reward-region activation resembling substance dependence, a blood-oxygen signal rather than dopamine, though how closely that parallel runs in people is still unsettled. The “can’t stop” experience isn’t simply weakness: it has a measurable neural signature. This companion explores the hyperpalatability formula, the reward system hijack, why satiety fails, and practical implications for recognition and avoidance. (5 min read)

Your body defends a particular weight range; one model calls that a set point, and it is not the settled one. Lose weight and it fights back: metabolic rate drops beyond what the smaller body explains, ghrelin rises, and muscle does about 20% more work per calorie. The Biggest Loser contestants were still running a 499-calorie-a-day adaptation six years on, and in those who regained the weight it had worsened rather than eased. Across 29 long-term studies, more than half of lost weight returned within two years and more than 80% by five, a measure of how much weight comes…

Artificial sweeteners aren’t metabolically free despite zero calories. On a learning account they maintain your taste for intense sweetness, may trigger insulin responses to the taste of sweet, and research by Suez and colleagues shows they alter gut bacteria, causing glucose intolerance in mice, with a smaller and mixed human signal. The habit of reaching for sweet drinks persists. This companion explores the sweetness problem, the insulin question, gut microbiome effects, why the habit architecture remains intact, and practical options for transitioning away. (5 min read)

Vinegar blunts the post-meal blood sugar spike: most with high-glycemic meals, little with low-glycemic ones. How it works is less settled: slower stomach emptying and slower starch breakdown are proposed, with conflicting results. Vinegar before a carb-containing meal is simple to try; the trials gave it diluted in water, and a vinaigrette is an untested way to take it. This companion explores the mechanism, the research from Johnston, Ostman, and others, practical application (timing, amount, type), what vinegar doesn’t do, and easy implementations. (5 min read)