How come I lose and gain weight so fast?

Hi, so I've just been wondering about this. The other day I ate a lot of junk food and at the end of the day I weighed myself at 103.5. This was four days ago.
I didn't eat a whole lot during the couple of days following, weighed myself yesterday morning and my weight came up as 99.1. The scale is fairly new and it's supposedly 99% accurate, so I don't think it's off or anything.

But another thing is, if I eat a lot of food then it will show (my stomach will descend) plus my weight can go up about one to three pounds in one day, without even eating a really large amount of food, just a moderate amount.
I also get full really quickly (yesterday I ate three small slices of turkey and I felt stuffed- wtf?

I'm 15 and five foot tall if that helps anything.

can someone tell me what's wrong with me? x.o
 
Body weight fluctuates with hydration, amount of food in the intestinal tract and many other factors: fluctuation is normal.

When you eat carbs, you generally retain more water....the opposite when you go lean on carbs.

The scale only measures weight....it can't see your muscle, hydration, bone-density, etc, etc. I really doubt your actual body fat is fluctuating that much.

And lastly...it is what it is.
 
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