They weigh about hundreds of kilos and it can be either 'diet or die' for most of them. Pictured is Paul Mason, 51, once considered the world's fattest man when he weighed 444.5kg.
Meet these heavy men, women, and even an 11-year-old boy.
Eating addiction and genetic predisposition to obesity are the two main reasons behind their obesity.
Lucky for them, they are undergoing weight loss treatment with professional help.
STOMPer sunkistorangejuice wrote:
"Wow! I feel sorry for these people actually.
"Hope that they will regain a healthy weight soon.
"They got to have perseverance and determination!"