Obesity a desease?

[Soulforged]

In my country (Argentina) there's as of late an obsession with reclaming from the government any ridicolous right a person's mind can come with. The new trend is obesity. Impulsed by a TV Show called "Cuestión de peso" (A question of weight) in which participants tell their sad stories of fatness. Tears are shed, people huged and laws reclaimed...Now I began to wonder as I saw them (a robust group of argentinian fat mans and womans) protesting before the national Congress, what was that they wanted exactly, what was what they called "Obesity Law", all kinds of funny images about forcing people to be fat or forcing them to not insult fat people passed through my mind...However, of course, it wasn't anything of the sort. What they want is to be treated for obesity. The reason: they claim obesity is a desease, with all its implications, including the oh so famous: its not my fault. The implications for the economy of this country (economy in a double sense here of political space and of the Economy) are great but because most backroomers can't really care about that, I will make the next question: I don't know everything about obesity, I was rather obess sometime in the past, but I don't presume to know everything about it. So I want to know the opinions of the regulars here specially those who are studying medicine.

Is obesity a desease?

EDIT: Gramar.