Depends how drastically your changing your diet to. If your body is used to eating crap and you cut the fat you kinda shock the system until your metabolism readjusts. Of course its the same principal that puts it all back on just as fast.
You want to lose body fat go to a U weight loss place that shit is crazy. In less than a couple months my dad went from being like 246 to 180. (he is five foot eight and over 55.) I shit myself because he said he was gonna lose weight did that and walked a couple miles twice a day and literally was going through clotthes rapidly till he got to phone me proudly when he boutht a pair of pants the same size I wear. That shit is incredible if you take it and are disciplined enough to follow their diet.
By changing my diet and exercising routines, i went from 200 lbs down to 182 in 30 days.
More running and cardio exercise instead of lifting weights.
But more importantly - the diet.
Gave up eating bread almost entirely. Gave up eating fried foods almost entirely.
I added a lot of vegetables/salads and a lot of white meat to my diet.
Annyways. It paid off.
I didn't go for the 6 pack, getting ripped and stuff.
That would mean i would have to give up partying, alcohol and a lot of nights in the clubs. Not worth the effort.
I just wanna feel good in my body and look athletic. Wich i do.