Warren eats breakfast from a McDonald's drive through.
"Warren Buffett, one of the world's wealthiest billionaires, eats the same breakfast every day. He stops by McDonald's on the way to his office and orders one of the three items – two sausage patties, egg, and cheese, or a bacon, egg, and cheese."
From:
What frugal billionaire eats almost every breakfast at McDonald’s?
He does not drink alcohol or smoke tobacco products. In any case at age 91 he is still going strong.