Humans aren't the only ones gaining weight, animals are too: Fluffy article: http://news.discovery.com/animals/fat-pets-obesity-weight.htm http://news.discover

Humans aren't the only ones gaining weight, animals are too: Fluffy article: http://news.discovery.com/animals/fat-pets-obesity-weight.htm http://news.discovery.com/animals/fat-pets-obesity-weight.ht... Nature article: http://www.nature.com/news/2010/101124/full/news.2010.628.html http://www.nature.com/news/2010/101124/full/news.2010.628.ht... Paper focusing on both lab animals (where diet is strictly controlled), pets, and feral rats living among humans: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3081766/ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3081766/