Even if he sometimes took his coffee and tea with sugar, he was likely getting at max a couple of hundred calories per day. He lost on average about 0.73 pounds per day over that 382 day span. That is a caloric deficit/differential of about 2600 calories of fat per day.
History DefinedIn June of 1965, Angus Barbieri, a seemingly average, normal Scottish man, captured the world's attention. embarking on what would become an unbelievable 382-day fasting journey. Barbieri shattered all records and expectations, stupefying scientists, and public onlookers. Barbieri's Life Before Very...
https://www.historydefined.net/angus-barbieri/