Tag: Knowledge recall

Ketones are molecules produced by the liver when fat is broken down — your body’s backup fuel system. Production begins when glycogen depletes (typically 12-24 hours into a fast) and ramps up significantly by 24-48 hours. Research by Cahill documented how ketones can fuel most tissues including, crucially, the brain — providing up to 75% of its energy needs during extended fasting. This companion covers what ketones are, the hour-by-hour timeline of ketone production, what they can and cannot fuel, and why mental clarity often improves once ketosis is established. (4 min read)

Liquid calories don’t trigger satiety — you can drink hundreds of calories and feel no fuller. Research by DiMeglio and Mattes showed people who consumed liquid carbs didn’t reduce subsequent food intake; solid calories did. Liquids bypass chewing, stomach stretch, and digestive time signals. A daily pattern of juice, sweetened coffee, soda, and wine can add 550 invisible calories. This companion explores the missing satiety signal, common liquid calorie sources (some “healthy” smoothies hit 800 calories), and the simple rule: drink for hydration, eat for calories. (4 min read)

Glycogen — stored glucose in liver and muscles — provides about 2,000-2,400 calories of energy, lasting roughly 24 hours of fasting. Once depleted, the body shifts to fat-burning: breaking down fat into fatty acids and ketones. Research by Cahill documented this metabolic switch. 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 stores 3-4 grams of water per gram). (4 min read)

The Minnesota Starvation Experiment involved continuous severe calorie restriction — participants ate 1,500 calories daily for six months with severe physical and psychological effects. Intermittent fasting produces different outcomes because the body responds differently to “not eating” versus “eating but not enough.” Fasting triggers hormonal shifts (increased growth hormone, preserved metabolism) while chronic restriction triggers starvation adaptations. This companion explores the experiment, why fasting is different hormonally, metabolically, and psychologically, and the key binary distinction. (4 min read)

All diets work short-term because restricting intake draws on body reserves. They fail long-term because restricting calories triggers metabolic slowdown, hunger hormone surges, and set-point defense — the body fights back. Research on Biggest Loser contestants showed metabolic rates stayed suppressed years later. The diet ends but the adaptations persist, often resulting in regaining more than was lost. This companion explores initial success, metabolic pushback, the set point problem, and what actually works: addressing hormonal drivers rather than just reducing intake. (4 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. Research by Sarri found those adhering to fasting traditions had better health markers even within the same population. The modern “Mediterranean diet” exports the food list while stripping out the eating pattern. This companion explores what researchers missed, the confounded variable, and what focusing exclusively on food composition while ignoring meal timing overlooks. (4 min read)

“Hyperpalatable” foods combine sugar, fat, and salt in proportions that are rare in whole foods and ubiquitous in processed ones — combinations that overstimulate reward pathways and suppress satiety signals. Fazzino and colleagues identified three key combinations that trigger excessive consumption. They show 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 weakness — it’s the intended response to products designed for that effect. This companion explores the hyperpalatability formula, the reward system hijack, why satiety fails, and practical implications…

Your body defends a particular weight range — this is your set point. 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 back, not of how many people fail.…

Artificial sweeteners aren’t metabolically free despite zero calories. 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. (4 min read)

Vinegar’s acetic acid slows starch digestion and blunts the post-meal blood sugar spike — most with high-glycemic meals, little with low-glycemic ones. Multiple studies confirm the effect: it works through slowed gastric emptying, inhibited starch breakdown, and improved insulin sensitivity. A salad with vinaigrette before a carb-containing meal is one of the simplest interventions available. 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)