Sama Hoole argues that fasted training is essentially a non-issue for people following a carnivore diet. In her view, the central reason is that the body already operates on the same metabolic “fuel” whether a person has eaten recently or not. When someone follows a carnivore approach—typically emphasizing animal-based foods and cutting out carbohydrates—the body shifts toward using fat stores and ketones as primary energy sources. Because fasting naturally reduces incoming energy from meals, the question of whether workouts should be affected by not eating depends largely on what fuel the body is prepared to burn.
Hoole’s core claim is straightforward: on carnivore, you can fast and still perform training because your body remains adapted to burning fat and ketones. She describes a continuous cycle—fasting, then eating, then training—where the body’s energy system does not fundamentally change. Whether a workout happens during a fast or after consuming food, the body draws on fat and ketones for energy rather than relying on carbohydrate-driven pathways.
The argument is presented as a practical and metabolic explanation. Hoole suggests that the perceived performance concerns around fasting workouts largely stem from the assumption that the body requires meal-derived carbohydrates to sustain training. On a carnivore diet, however, she claims the body is already running on an alternative energy system. Therefore, skipping a meal does not represent a dramatic switch in fuel availability. In her framing, fasting simply keeps the body using the same mechanisms it has already been trained to use through the diet.
Hoole also emphasizes that training during fasting is not something that should be feared as a special case. Instead, she portrays it as an extension of the same metabolic setup that continues throughout the day. According to the narrative, you can fast, your body uses fat and ketones for energy; when you eat, you still remain reliant on fat and ketones; and when you train, the same energy sources remain available. By repeating this pattern, she conveys that fasting is not a disruption but a variation within an already established metabolic routine.
This message functions as reassurance for those considering or already doing fasted workouts while adhering to carnivore. It addresses a common worry: that exercising without food could lead to low energy, impaired performance, or an inability to sustain effort. Hoole’s position counters that concern by claiming the body’s energy production is already adjusted to the diet’s conditions. Since fat and ketones can supply energy, she implies that workouts can proceed with stable fuel availability.
Importantly, the statement is framed less as a debate about exercise timing and more as a claim about physiology and adaptation. The “engine” metaphor highlights the idea that the body’s energy system is already tuned to burn fat and generate ketones. If that tuning is true, then the existence of fasting should not cause the sudden energy deficit that people expect under carbohydrate-based assumptions.
While the text excerpt is concise and centered on a single perspective, the conclusion is clear: on carnivore, fasting does not create a special metabolic problem for training. Hoole’s reasoning is that the body uses the same energy sources in all relevant states—fasted and fed—so exercise performance should not collapse simply because food is absent at the time of training.
Overall, the story promotes the idea that dietary context can change how training and fasting interact. For carnivore dieters, Hoole suggests that the body is already operating on the energy pathways needed for activity, making fasted training a non-issue in practical terms. The emphasis remains on fat and ketones as the consistent “fuel” that supports fasting, eating, and training alike.
Source: Sama Hoole
Sama Hoole: Fasted training is a non-issue on carnivore, and it’s because the engine is already running on the same fuel either way. You fast. Your body uses fat and ketones for energy. You eat. Your body uses fat and ketones for energy. You train. Your body uses fat and ketones for. #breaking
— @SamaHoole May 1, 2026
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