Overweight actors are excluded from major roles because they are never allowed to fall in love or have sex on screen, according to James Corden.

The British star said he wrote his breakout hit, Gavin and Stacey, only because he was frustrated at the lack of career opportunity for people of his size.

"If an alien had to take a reading on Planet Earth by just watching films or TV they would imagine that if you are chubby or fat or big, you never really fall in love, you never have sex.

“Certainly no-one really ever finds you attractive. You will be good friends with people who are attractive and perhaps chip in with the odd joke every now and again.