Will a heavier (300 lb) male lose weight quicker than the average person?

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He have been eating healthy for the past two months now (not starving himself and focusing on nutricious foods) plus working out on a treadmill/eliptical trainer for 45 minutes a day 4 to 5 time per week. He seems to be dropping 3 to 4 ponds a week, is this normal since everywhere I read says lose no more than 2 lbs per week. I assume its beacuse his weight started much higher than the average person. What do you think?