Someone really needs to explain how EXACTLY "pounds can go piling back on" if the person maintains a healthy diet low in calories. It is just not possible for the body to create fat out of nothing. The slowest metabolism in the world can't create weight out of thin air. 

"there is a weight that is easy to maintain, and that is the weight the body fights to defend"
This is complete bunk and people who believe this are simply never going to be successful at controlling their own body size. Your body is the result of your lifestyle, and most people have a lifestyle in which they eat a particular amount and type of food.

The researcher sort of alluded to this by commenting on "incessant hunger." It's not the metabolism causing weight gain, it's the eating! People want a magic pill, they want to be considered different from everyone else, special, unable to lose weight a "normal" way. But no one is immune from the laws of thermogenics. Calories in, calories out, that's all there is to it.