Telling a person they're fat makes them even fatter: Stress of being warned about weight gain stops people adopting healthier lifestyles
Telling someone they are overweight is likely to make them eat even more
Stress of finding out may be trigger that stops them from living healthier
Those who are unaware may be better off kept in the dark, experts say
http://www.dailymail.co.uk/news/article-3189952