I have and do this here n there longest was 72 how it was pretty tough until you realize it's all in your mind we were made to be able to withstand long periods without eating as long as we have water I believe in giving your body a break also from always working and breaking down food took massive cleansing dumps when I tasted by the end felt good I don't do it all the time but will time to time especially after a high calorie day I'll skip breakfast and lunch