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I believe that some people are naturally fat. I know people who eat a balanced diet and exercise regularly. The problem with society is we judge people on how big they look. Not everyone who is big is that way due to excessive amounts of fizzy drink. The BMI is also a very misleading figure and is probably the reason why the obesity epidemic appears so severe. Rugby players have a high BMI despite being fit and healthy. Basically anyone who is really into weight lifting will have a BMI of 25 plus. When governments collect data for obesity the figures will probably be taken from the BMI of the public.