Wadlow reached 8 feet 11.1 inches (2.72 m) in height and weighed 490 pounds (220 kg) at his death. His great size and his continued growth in adulthood was due to hypertrophy (A nontumorous enlargement of an organ or a tissue as a result of an increase in the size rather than the number of constituent cells) of his pituitary (the gland at the base of the brain which secretes hormones that affect skeletal growth, development of the sex glands, and other functions of the body) gland which results in an abnormally high level of human growth hormone. He showed no indication of an end to his growth even at the time of his death.

Robert Wadlow standing next to his father.
A = Age - H = Height - W = Weight:
A = 4 - _H = 5 ft 4 in (1.6 m)
A = 8 - _H = 6 ft 2 in (1.9 m)
A = 10 - H = 6 ft 6 in (2.0 m)_______W = 220 lb (100 kg)
A = 13 - H = 7 ft 4 in (2.2 m)
A = 16 - H = 7 ft 10.5 in (2.40 m)__-.W = 365 lb (166 kg)
A = 17 - H = 8 ft 1.5 in (2.48 m)___-.W = 400 lb (180 kg)
A = 18 - H = 8 ft 4 in (2.5 m)_____..-W = 390 lb (180 kg)
A = 19 - H = 8 ft 6 in (2.6 m)_____.-.W = 435 lb (197 kg)
A = 21 - H = 8 ft 9.5 in (2.68 m)_.....W = 491 lb (223 kg)
A = 22 - H = 8 ft 11.1 in (2.72 m).....W = 490 lb (220 kg)
Robert Wadlow 6 ft 6 in (1.98 m) at age 10
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Source: http://en.wikipedia.org/wiki/Robert_Wadlow
What's your thoughts on this? do you think he, his parents or someone drugged him? Or was he just an abnormal human being. Discuss.