Most likely, the reason you want to lose weight is because you’re carrying too much fat, and you want to change your body shape. It’s really not so much the number on the scale, although they’re certainly related.
Your scale weight, which is your total body weight, is composed of two things- body fat and lean mass, fat and lean. We all know what fat is, lean is everything else- muscle, bone, blood, organs, skin- all of the weight you carry that isn’t fat.
When you just lose scale weight by reducing the calories you eat without any resistance exercise, you’re losing both body fat and lean mass, which includes muscle. Your clothes might fit you better, but it’s quite possible that you’ve just become a smaller version of what you were before. If your body fat was in the 30% or more range (which is considered obese), you might still have 30% or more body fat even though you weigh less and wear smaller sizes.
Most diets are focused on losing scale weight.
You want to be focused on losing body fat.