These are the stories in June 2008 detailing the causes of obesity.
Serotonin causes obesity: “A study on worms shows that serotonin levels in the nervous system influence feeding and fat. Serotonin, a neurotransmitter, also acts independently to control eating and what your body does with those calories once they’ve been consumed, the study said.”
Genes cause obesity: “Our results confirm the association between FTO and fat mass and indicate that the 5-LO promoter modifies the association between FTO and lipid levels.”