I think weighing any more than once a week is pointless. Day to day variations are affected by how much fluid you're holding, how much food is in your colon, how much glycogen is in your liver and muscles. It really is a pointless exercise to weigh yourself daily and try to look for answers by looking at your food intake. Once a week will show you the trends and after a month, once you see what that trend is (either up or down) you could then have a look at your food intake, exercise schedule, etc and see if changes need to be made. Trying to make reasoned decisions on food intake based on daily weighing is a complete waste of time.