New York, March 26 - Actor Gerard Butler went on a cleansing diet for 16 days and then followed a measly 500 calorie-a-day diet in order to lose weight.

'It was so depressing... In the morning I think I had half a grapefruit and that was pretty much about it until two (in the afternoon) - and I was training as well,' hollywood.com quoted him as saying.

Butler had to lose weight and look fit for his new flick 'Bounty Hunter'.

IANS