It's been said plenty, but it is a fairly important concept. You don't want to lose weight, you want to lose body fat. You've spent a lot of time thinking about how you want to look, how you want your clothes to fit when you hit your goals and how you want to feel.
Weight Loss (from crash dieting. little, no or improper training)
-negative effects on immune system
Fat Loss (eating well. proper training)
Stored Body Fat loss
+improved immune system