[adamnemecek]

Why is the weight loss mechanism different under those circumstances?

[chollida1]

http://www.livestrong.com/article/406097-why-do-overweight-p...

http://forum.bodybuilding.com/showthread.php?t=121373121&pag...

Higher Metabolism, more water weight to shed.

[jadyoyster]

Might be due to the muscle mass needed to carry such a heavy body around? Big muscles waste energy, even doing nothing much at all.

[Someone]

Is it that much different? 5/300 vs, say, 2/150 is only 25% larger.