Try not to worry, I never had a full on app. for this but did fill in a large questionnaire, which led onto how we feel about things in life and ourselves and our bodies. It was from that questionnaire that they sent me for sleep apnoea test which was positive and now don't have it afetr losing some weight. I think the nurse discussed what I had put and I told her how i new i couldn't afford to put on any more weight, it was affecting my life and i needed help and had been asking for a long time and tried everything else possible, but that was just a routine app at SRH so not sure bout other hospitals just be open and honest about what you eat how much you eat. Good luck you'l breeze it xx