Its all weight.
Its impossible to know how much is water and how much is fat. Water fluctuates daily, depending on SO many different variables.
BUT - the scale is down! And if you don't go back to your old high sodium/processed foods that caused you to gain the water weight in the first place, its gone for good (or at least until TOM brings a bit of it back). So thats WEIGHT that is GONE, and it doesn't really matter, IMO, what sort of weight it is.
You'll know for sure, though, if you stick with it...I would think that the portion of your weight loss that is fat is approximately what you lose in the 3rd or 4th week of your plan, and the rest in that first week was probably water. But honestly, I wouldn't worry too much about it!
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