Re the fat: when I started calculating every morsel going into my mouth I was astonished to find that my diet each day is over 50% fat. Even when I was losing weight steadily. Fat does NOT make you fat.
His diet sounds ideal, though I don’t understand the fern either, makes sense that it might be some medicine.
Or poison. Maybe that’s what killed him. Someone slipped some poison fern into his meal at a gathering. Presto new clan leader.