At the beginning of a lot of people's weight loss adventures, when they switch over from eating anything tehy want - and generally not healthy - to foods that are healthier andnot packed with preservatives and stuff - the body will respond by letting go of water weight that's hanging around the body.. which is why a person can put of up bigger numbers at the beginning of their weight loss journey than a few weeks into it.
By losing weight at a reasonable pace, like 1 percent of your body weight a week, by healthy eating and exercise, you not only lose fat, but you will also retain muscle... if you jsut crash diet and not feed your body you run the risk of losing muscle as well.
Yes, the scale might move but it doesn't mean you're l osing fat...
There's a big difference between fat loss and weight loss...