营销话术证据 C · 证据有限
练耐力必须生酮
真相
生酮是治疗性饮食, 不是耐力标配; 糖原耗尽时高强度无氧表现通常下降, 长期心血管影响也不清。
机制速览
生酮饮食是极低碳水（通常 <50g/天）、高脂肪（70-80% 热量）、适量蛋白的模式。碳水一断，肝脏就把脂肪酸拆成酮体（β-羟基丁酸、乙酰乙酸），让大脑和其他组织改烧酮体。这不是一种生活方式饮食，而是一种治疗性饮食。
来源（3）
- Ludwig, D. S. (2020). The ketogenic diet: evidence for optimism but high-quality research needed. Journal of Nutrition, 150(6), 1354-1359. Well-formulated ketogenic diets appear more effective than low-fat diets for obesity and T2D short-term; chronic ketosis may have unique metabolic benefits; high-quality long-term RCTs are needed.
- Crosby, L., Davis, B., Joshi, S., Jardine, M., Paul, J., Neola, M., et al. (2021). Ketogenic diets and chronic disease: weighing the benefits against the risks. Frontiers in Nutrition, 8, 702802. Ketogenic diets may provide short-term improvement for some conditions but typically increase saturated fat intake, decrease protective foods; LDL may rise; long-term safety data are lacking; for most individuals risks may outweigh benefits.
- Gardner, C. D., Trepanowski, J. F., Del Gobbo, L. C., Hauser, M. E., Rigdon, J., Ioannidis, J. P. A., et al. (2018). Effect of low-fat vs low-carbohydrate diet on 12-month weight loss in overweight adults and the association with genotype pattern or insulin secretion: the DIETFITS randomized clinical trial. JAMA, 319(7), 667-679. 609 adults, 12 months; no significant weight-loss difference between healthy low-fat and healthy low-carbohydrate diets, and neither genotype pattern nor baseline insulin secretion predicted which diet worked better.