Biomass Bob

Starch becomes glucose. Glucose stimulates insulin. Therefore, potatoes are unhealthy, especially if you're insulin resistant or overweight. That's basic physiology followed by a completely unjustified conclusion. Insulin is not a toxin. Glucose is not the enemy. And potatoes are among the most filling, affordable, nutrient-rich carbohydrate foods available. WHAT HUMAN RESEARCH ACTUALLY SHOWS Insulin helps regulate glucose uptake, glycogen storage, and nutrient metabolism. Its release after eating is normal physiology. Insulin resistance describes impaired responsiveness to insulin, not simply its presence in the bloodstream. And the human evidence directly challenges the blanket warning: - 36 insulin-resistant adults: An eight-week randomized trial found approximately 5.6% weight loss on a low-energy-density potato-based diet. HOMA-IR improved among completers, although not significantly in the intention-to-treat analysis. - 24 adults with type 2 diabetes: Potato-containing mixed dinners produced lower overnight glucose exposure than rice. Post-meal glucose exposure did not differ significantly, while cooled potatoes produced higher post-meal insulin exposure. - 205,107 adults: A 2025 prospective analysis associated French fries with higher diabetes incidence, while combined baked, boiled, and mashed potatoes showed no significant association. The weight-loss trial tested complete diets, not potatoes in isolation. It demonstrates that potatoes can fit into successful weight-loss diets even among insulin-resistant adults. AND THE COMPLETE MEAL CHANGES THE RESPONSE In an experiment involving 11 adults, mashed potatoes alone had a glycemic index of 108. Combined with chicken, rapeseed oil, and salad, it fell to 54. Insulin responses also changed, though not by the same proportion. But here's where the insulin argument gets particularly absurd. Protein-rich foods stimulate insulin too. In a controlled insulin-index experiment, beef produced a higher insulin response than white pasta in equal-calorie portions, despite a much smaller glucose response. If insulin secretion alone made food unhealthy, the same logic would condemn the animal foods recommended as replacements. And lower insulin doesn't automatically mean greater fat loss. In a metabolic-ward experiment involving 19 adults with obesity, reducing carbohydrate lowered daily insulin secretion by approximately 22%. Yet reducing dietary fat by the same number of calories produced greater net body-fat loss over six days, as measured by metabolic balance. More fat oxidation, lower insulin, yet less net fat loss. An isolated glucose or insulin response simply cannot determine a food's overall metabolic value. WHY POTATOES ARE EXCEPTIONAL FOR WEIGHT MANAGEMENT Potatoes combine low calorie density, substantial satiety, and valuable micronutrients. - Calorie density: Approximately 87 kcal per 100 g boiled, compared with 130 for cooked white rice and 158 for cooked pasta. - Potassium: A 250 g serving cooked skin-on and then peeled supplies approximately 950 mg potassium for only 218 calories, alongside vitamin C, B6, and other nutrients. - Satiety: In a controlled 38-food comparison, boiled potatoes ranked highest, scoring 323 versus 176 for beef and 100 for white bread. Human feeding trials reinforce these advantages: - 14 adults: Potato-based meals produced lower hunger ratings and greater immediate fullness than rice- or pasta-based meals supplying the same carbohydrate. - 26 adults, 2024: Meals containing instant mashed potatoes or oven-baked fries resulted in 13–16% lower combined energy intake across the test meal and a subsequent pizza meal than rice-based meals. Interestingly, the 2024 potato meals produced higher post-meal insulin concentrations despite lower total energy intake. Another demonstration of why treating insulin secretion as an automatic sign of harm misses the bigger picture. POTATOES AND EGGS: EXCEPTIONAL PROTEIN COMPLEMENTARITY Pointing out that potatoes contain little protein per 100 grams misses their nutritional role. Potatoes supply carbohydrate and micronutrients. Eggs supply concentrated protein and fat. Their amino-acid profiles complement each other exceptionally well. Historical human nitrogen-balance research reported a relative biological value of 137.6 for a specific potato–egg protein mixture, with whole egg set at 100. The mixture supplied 65% of its protein nitrogen from potatoes and 35% from eggs. The score compares minimum nitrogen requirements, not absorption percentages or muscle growth. It demonstrates the remarkable complementary quality of these two protein sources. A meal of potatoes, eggs, and butter brings together readily available carbohydrate, high-quality protein, fats, and micronutrients in one inexpensive, satisfying combination. Even preparation improves the nutritional result. In an experiment using Bintje potatoes, peeling before cooking resulted in roughly 40–45% vitamin C loss, compared with approximately 7% when cooked unpeeled. Cooking sound potatoes skin-on and peeling afterward can preserve considerably more vitamin C. Green or heavily sprouted potatoes should be discarded because of glycoalkaloid concerns. THE IRONY OF ELIMINATING CARBOHYDRATES One of the weakest arguments against dietary carbohydrate is that the body can manufacture glucose itself. Of course it can. Glucose is so important that the body maintains its supply even when dietary carbohydrate approaches zero. This happens partly through gluconeogenesis, the production of glucose from non-carbohydrate substrates, including glucogenic amino acids and glycerol. The process requires energy. Dietary carbohydrate, meanwhile, supplies glucose directly and helps replenish glycogen. And severe carbohydrate restriction produces measurable physiological changes: - Thyroid and protein metabolism: In six healthy men, 11 days at just 2% carbohydrate, with calories matched, lowered circulating T3 by roughly one-quarter and increased urinary nitrogen loss. Resting energy expenditure and TSH did not significantly change. - Cortisol: A meta-analysis of 27 intervention studies involving 309 men found higher resting cortisol during low-carbohydrate interventions shorter than three weeks, but no consistent increase in longer interventions. Cortisol after prolonged exercise was also higher. The liver produces glucose as part of normal metabolism. Its ability to increase production when carbohydrate is scarce is an impressive adaptation. But the ability to manufacture something does not establish that withholding its dietary supply is preferable. Especially when that dietary source also supplies substantial potassium, vitamins, exceptional satiety, and readily available energy. THE BOTTOM LINE Potatoes aren't supposed to replace meat or eggs. They complement them. Their low calorie density, substantial food volume, micronutrients, and protein complementarity make them particularly useful in satisfying, nutrient-dense meals. And the human research challenges the idea that people with insulin resistance or excess body fat should categorically avoid them. Starch becoming glucose is basic biochemistry. Calling potatoes unhealthy because of it is not nutritional insight. It's confusing a necessary metabolic process with evidence of harm. You can find a complete and free article with references in the first comment. It explores how adding fat affects glucose and insulin responses, how storage changes vitamin C, and how potatoes can fuel endurance exercise. It also includes practical meal details, a checklist, and the full references. General information, not medical advice.