Sardine Fast (Dom D'Agostino variation)
The speaker heard about this directly from Dr. Dom D'Agostino and recounts the conversation as validation that a high‑fat, low‑calorie day can produce 'huge effects' comparable to a fast while keeping muscle intact.
He did this thing called a sardine fast where he was talking about he just ate 500 calories worth of sardines in olive oil per day for like two days. And it has these huge effects almost like it's a fast except you're keeping calories and maintaining muscle.

