No I would have an UP, otherwise you will find tomorrow a struggle without food on board, when you work out your cals it factors in your exercise so it doesn't allow you to offset ita all about food in not burnt off if that makes sense, if after the initial 2 week when your body should be used to the feast/famine regime you could always try offsetting your cals it may work for you but you need to be strict during the first 2 weeks x