A study in the Archives of Internal Medicine says that, yes, there is in fact a genetic variation that makes people more likely to gain weight. The good news is if you have it you can beat the odds and stay slim by being active. The bad news is you need to be active for 3-4 hours a day. Meanwhile, another study, this one in the Journal of Consumer Research, says watching crime shows like Law & Order, CSI, and The Closer cause you to be reminded of your mortality, which makes you spend more on groceries. And eat them. To recap, if you have standard issue genes, get an hour of exercise every day. If you have the fat gene, get at least three hours of exercise. If you have the fat gene and love crime shows, watch them while on the treadmill or you’re going to become Jenny Craig’s best friend.