In 1965, a 27-year-old Irishman named Angus Barbieri, who suffered from severe obesity, did it for 382 days.
He survived for over a year on just his body fat, plus water, other fluids, and supplements, going to the bathroom approximately once every 40-50 days.
The sensational fast was prescribed by Dr. William Kinnear Stewart and took place under controlled conditions, with frequent blood tests and hospital monitoring.
Initially, the treatment was supposed to last only 40 days, but Angus unexpectedly found himself calm, stating that his body was getting used to the absence of food and, thanks to his great desire to achieve the goal, he decided to continue with the treatment. (bitter end.)
In the end, starting from an initial weight of 207 kg, he managed to lose 125 kg, thus reaching his ideal weight of 82 kg.
He broke his fast on the morning of July 11, 1966, by eating a boiled egg, a slice of bread with butter, and a cup of coffee, stating in a later interview that he enjoyed the meal very much, but that it immediately made him feel full.
In the following months and years, he continued to be monitored by doctors, and the last check-up, five years later, showed that his weight remained below 90 kg, a value he maintained for the rest of his life.