"Fat fasting" (fasting based solely on the ingestion of fats) within a carnivore diet is an ineffective method for fat loss, as it often leads to a massive caloric surplus and lacks essential fiber.

noli's read

The core principle of "fat fasting" relies on a caloric intake consisting almost exclusively of lipids. Abbey Sharp correctly points out that weight loss depends on an energy deficit, a well-established concept in nutrition (meta-analyses on energy balance). The excessive consumption of saturated fats (cream, butter) without fiber is criticized by research: observational and clinical studies consistently associate high fiber intake with better insulin sensitivity and sustainable weight management. The claim regarding the risk of vitamin A toxicity linked to significant consumption of cod liver is scientifically grounded (toxicity reports documented by various health authorities). However, the idea that saturated fats directly cause insulin resistance remains a debated topic, with evidence often nuanced by the overall quality of the diet. In sum, although the approach criticizes the caloric surplus of this practice, it relies on principles of nutritional density and overall balance rather than a pure prohibition of certain foods.

the sources

1. 1Hall KD, Heymsfield SB, Kemnitz JW, et al. 2012
2. 2Rolls BJ 2009