Recent research suggests that BPA, a chemical found in plastic water bottles, triggers the formation of fat cells and causes obesity in mice.

The worldwide obesity epidemic has been primarily explained in terms of poor diet, decreases in exercise, and other lifestyle factors. (I am planning a future series on weight loss, so stay tuned!) However, this research raises the possibility that hormone-disrupting contaminants such as BPA may play a role in regulating weight. BPA triggers and then stimulates two of the key biological mechanisms underlying obesity. It increases the number of fat cells, and it enhances their fat storage.

Source: Warning: drinking bottled water could make you fat!