Not in large volumes, but yes. The keto(genic) diet centers around using fat as a primary energy source. I do it as I have a chronic illness and having higher blood ketone concentrations helps immensely with my symptoms. If I have a high protein, lower fat meal (like sashimi), my ketone levels will drop, so I’ll supplement with a few tablespoons of medium-chain triglyceride oil to keep them level. It’s practically tasteless.