actually im fairly ripped at 275 i posted pics about 1 or 2 months back at that weight dropping calories reverses my metabolism and not enjoyable
I'll agree that severely dropping calories will slow your metabolic rate- that's how our bodies deal with starvation.
I'm talking about running a 10-20% deficit off of your daily BMR. Mine is about 2700 calories and I start losing weight at restricting to 2400 a day. Calorie counting is pretty inexact because you would have to have exact caloric values for everything you eat and also weigh your food. So I go as low as 2200 based on calorie charts and that accounts for the "fudge factor"
At 10-20% calorie restriction fat melts off in weeks and you don't feel like walking death.
BTW 275 and lean is pretty amazing.