One of the first diet books, “The Art Of Living Long,” came out in 1558 and is still in print. The author Luigi Cornaro was an extremely overweight Italian who at age 40 was tired of being overweight and feeling out of control. He limited himself to 12 oz. of food a day and 14 oz. of wine. He lived to be almost 100 years old. – WTF Fun Facts
Source: https://skyterrawellness.com/history-of-dieting/