Collagen breaks a fast. Collagen peptides are protein, which provides calories and raises insulin, so a scoop will end a fast and stop autophagy.
| Calories | ~35-70 kcal per scoop |
|---|---|
| Breaks a weight-loss fast? | Yes |
| Breaks ketosis? | No |
| Breaks autophagy? | Yes |
| Insulin impact | Yes |
Collagen is protein, and protein both provides calories and triggers an insulin response. A typical scoop has 35 to 70 calories and around 10 to 20 grams of protein, which is enough to leave the fasted state and switch off autophagy through the mTOR pathway. It does not raise blood sugar like carbohydrate, but it still breaks a fast.
Because collagen has no carbohydrate, it will not knock you out of ketosis, which is why some keto dieters use it. But ketosis and fasting are not the same thing: collagen still provides protein calories and stimulates insulin, so it breaks a fast. Save it for your eating window.
There is no fasting-safe amount of collagen, since even a small scoop provides protein calories. Take it during your eating window.
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