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Nutrition Expert Debunks The Carb & Insulin Resistance Myths — Key Takeaways

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Nutrition Expert Debunks The Carb & Insulin Resistance Myths

Jay Feldman Wellness17mAug 27, 2026

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Fat—not carbohydrates—is preferentially stored as body fat, because converting carbs to fat is energetically inefficient and the body loses energy in the process.

Key takeaways

Eating carbs alongside fructose sources is essential for proper fructose absorption

Eating carbs alongside fructose sources is essential for proper fructose absorption

  • Intestinal fructose transporters require glucose co-presence; isolated fructose is poorly absorbed and feeds endotoxin-producing bacteria.
  • All natural fructose sources (fruit, honey) pair fructose with glucose — processing that removes glucose disrupts this mechanism.

Fat-dominant (keto/carnivore) diets suppress thyroid T3, reproductive hormones, and metabolic rate

Fat-dominant (keto/carnivore) diets suppress thyroid T3, reproductive hormones, and metabolic rate

  • Relying on fat as primary fuel forces upregulation of cortisol, glucagon, and adrenaline, which suppress active T3 thyroid hormone conversion.
  • This is an adaptive starvation response — metabolically appropriate for famine, counterproductive for body composition or performance goals.

High-carb diets show equal or greater fat loss than low-carb despite higher insulin

High-carb diets show equal or greater fat loss than low-carb despite higher insulin

  • Multiple diet comparison studies find no fat-loss advantage for low-carb; higher-carb/lower-fat diets sometimes show more fat loss.
  • Undermines carb-insulin hypothesis: insulin level alone does not determine fat storage outcome.

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In this video

  1. 1mdo carbs, fructose, and insulin actually make you fat?
  2. 7mthe real reason your body stores fuel as fat
  3. 10mthe surprising reason you can become resistant to leptin
  4. 15mwhat happens to your thyroid when you rely on fat for fuel

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