How tall can a human being theoretically be?
Theoretically, a human being can reach a maximum height of around 7 feet, 9 inches (2.3 meters) if they are fully grown. This is based on the average height of a male adult in the United States. According to the Guinness Book of World Records, the tallest man was Sultan K��sen. Sultan K��sen (born 10 December 1982) is a Turkish farmer of Kurdish ethnicity who holds the Guinness World Record for tallest living male at 251 cm (8 ft 2.82 in). K��sen's growth resulted from the conditions gigantism and acromegaly, caused by a tumor affecting his pituitary gland.