72 year old Joan Collins has been revealing her secret to keeping slim. She only eats about 1/3 of what is on her plate, especially when she's in America, Female First reports.
Says Collins, 'I'm not fanatical, just disciplined. The waitress always askes me if everything is OK. They just give you far too much'. Also Joan never eats rubbish, she doesn't eat crisps or donuts.