Most likely just water loss... Every bodybuilder knows: when they start 'cutting', the first few kgs, in the first couple weeks are almost water loss and glyc

Most likely just water loss... Every bodybuilder knows: when they start 'cutting', the first few kgs, in the first couple weeks are almost water loss and glycogen, so you always discount it (i.e. don't count it as fat loss). Eating carbs (carbo-hydrades) makes your body retain more water. Less ingested carbs means your body will shed that extra water out. After the first week or so, if you keep losing weight, then it means that it is actual fat loss.