Panda put on a diet -- to help him mate and procreate

Apparently, the obesity epidemic isn't limited to humans -- it stretches to animals too, particularly Panda Bears. A panda in China, named Xuang Xuang, had been put on a diet in order to successfully mate with his partner Lin Hui. He's about 10kg overweight -- which is just enough to hurt his chances at mating. And since Pandas are an endangered species, it's especially important that they are able to produce offspring.

I find it alarming that it only takes an extra 10kg (that's 22 lbs!) to hurt this guy's chance at having a Xuang Xuang jr. Does extra weight also affect the chances of humans who are trying to conceive?