On the other hand, there is little doubt that overwhelming ingestion of anything will kill you. I'm not sure if it is too much or how long he kept it up, but 60g of butter sounds a lot to me.
So the traditional wisdom from what I remember is 20% fat, 30% protein and 50% carbs. 1000 calories a day from carbs means 250 grams of carbs a day. That sounds like a lot too.