Unbelievable Peoples

The Man who can't get fat:

Mr Perry, 59, can eat whatever he likes - including unlimited pies, burgers and desserts - and never get fat. He cannot put on weight because of a condition called lipodystrophy that makes his body rapidly burn fat.

He used to be a chubby child, but at age 12 the fat dropped off "almost over night". He initially tried to eat more to gain weight, but it had no effect. Mr Perry, of Ilford in Essex, endured a decade of tests before the illness was diagnosed. It finally emerged that his body produces six times the normal level of insulin. Doctors have admitted that the condition would be a "slimmer's dream".

The Man Who Doesn't Feel Cold:

Dutchman Wim Hof, also known as the Iceman, is the man that swam under ice, and stood in bins filled with ice. He climbed the Mt. Blanc in shorts in the icy cold, harvested world records and always stands for new challenges.

Scientists can't really explain it, but the 48-year-old Dutchman is able to withstand, and even thrive, in temperatures that could be fatal to the average person.

The Boy Who Couldn't Sleep: stayed awake 24 hours a day for years.

Rhett Lamb is often cranky like any other 3-year-old toddler, but there's one thing that makes him completely different: he has a rare medical condition in which he can't sleep a wink.

Rhett is awake nearly 24 hours a day, and his condition has baffled his parents and doctors for years. They took clock shifts watching his every sleep-deprived mood to determine what ailed the young boy.

After a number of conflicting opinions, Shannon and David Lamb finally learned what was wrong with their child: Doctors diagnosed Rhett with an extremely rare condition called chiari malformation.

"The brain literally is squeezed into the spinal column. What happens is you get compression, squeezing, strangulating of the brain stem, which has all the vital functions that control sleep, speech, our cranial nerves, our circulatory system, even our breathing system," Savard said.

The Girl Who is Allergic to Water:

Teenager Ashleigh Morris can't go swimming, soak in a hot bath or enjoy a shower after a stressful day's work - she's allergic to water. Even sweating brings the 19-year-old out in a painful rash.

Ashleigh, from Melbourne, Australia, is allergic to water of any temperature, a condition she's lived with since she was 14. She suffers from an extremely rare skin disorder called Aquagenic Urticaria - so unusual that only a handful of cases are documented worldwide.

The Girl Who Eats Only Tic Tacs.

eet Natalie Cooper, a 17-year-old teenager who has a mystery illness that makes her sick every time she eats anything. Well, almost anything. She can eat one thing that doesn't make her sick: Tic tac mint!

For reasons that doctors are unable to explain, Tic tacs are the only thing she can stomach, meaning she has to get the rest of her sustenance from a specially formulated feed through a tube.