carb-timing-for-muscle-fullness
Tristan Lee explains that even when extremely lean, having carbohydrates in the diet provides a higher baseline of glycogen, which fills muscles and avoids the depleted, stringy look common in keto bodybuilders who cut fat low. Thomas DeLauer adds that long-term keto/carnivore can cause loss of glucose tolerance, so when carbs are eaten, there's a significant water rebound and discomfort. By keeping carbs around workouts, you can maintain that tolerance and still benefit from low-carb for fat loss. Tristan notes that he would still use this approach even if he needed to get super shredded again, keeping carbs pre-workout and the rest of the day more keto/carnivore.
Carbohydrates are stored as glycogen in muscles, drawing water into the cells and increasing cell volume. This creates a fuller appearance. Additionally, maintaining some carb intake preserves the body's ability to handle glucose, preventing insulin resistance and the water rebound seen when carbs are reintroduced after long-term avoidance.
Tristan: 'I would keep carbohydrates in my diet just because I have found that from an aesthetic perspective, it fills your muscles more.' Thomas: 'I would go back to a keto carnivore for most of the day with slightly lower fat than I normally would, but I would have the carbohydrates pre-workout.'
Having carbohydrates in your diet, having a higher baseline of carbohydrates is going to provide higher baseline level of glycogen likely. And so if you're looking for aesthetics, filling the muscle cells as much as possible and giving you that full look... is going to have a better effect than having no carbs.

