Amy Winehouse

Is It Natural for my weight to Go Up about 4lbs after I\’ve eaten a few snacks,food and in a few days time?

On Saturday morning I weight myself on The Wii Fit and it said that I’ve lost the 4lbs I was meant to loose from 10stone 5lbs a mouth and then the next day I weight myself it said I put on 1lbs and then I weight myself today and it says I’ve gained back the 4lbs already. How could that be, it there something wrong with me or something. I’m 15 years old, I’m roughly between the height of 5ft 4inches and I’m trying to get down to 9stone 12lbs and it was gong so well when i lost the four pounds but why the hell have i gained it back already. My mum says that i shouldn’t really weigh myself in the afternoon especially if I’ve eaten, but then again I do exercise a lot and sometimes it would say I’ve lost weight, but then sometimes it will say I’ve put on like 4lbs or 5lbs. Why is that!! Is it because of what i eat?? Generally I eat very healthy and drink water and exercises with Zumba everyday for 1 hour so it’s kind of strange, although i have been noticing that on the Wii Fit my weight changes little by little in less that 1 second is that normal, I mean getting lighter an lighter. Also is Wii fit an accurate scale for really weighing yourself and is it right about me loosing or gaining the pounds, and if it said i weight 10st 1lbs would it be true on a proper digital scale or would it say more or less say like my BMI was bigger really??? Also when would be a perfect time to weight myself, and it it normal to go up in 4lbs within a few days, after a snack or two, or a little bit of sweets in between??? Please help because this is really Getting on my nerves right now and getting in the way of important things!!! I can’t take it any more. I just want to be 9stone 12lbs again so bad!!!