I know our weights vary throughout the day as we eat and remove waste but what is considered to be a normal variation? My weight can be as much as 5lb different between morning and evening (with all other factors such as clothing, temperature, position of scales etc taken into account). If I've forgotten to weigh in the morning it can be VERY demotivating to see an evening readout but if I don't step on the scales once a day I feel guilty (I have no idea why - and I'm only obsessed with the scales when I'm dieting).