Experts are learning that inflammation may be a root cause of many mental disorders, including depression. So it makes sense that an anti-inflammatory agent like aspirin might help. In one recent study, rodents that were genetically predisposed to depression-like symptoms became downright cheerful when given low doses of aspirin for three weeks. Scans revealed higher levels of the mood-regulating chemical serotonin in their brains, and they started swimming more quickly when thrown into water—indicating what can only be interpreted as a real zest for their shitty lab-rat lives. Randall Stafford, a professor of medicine at the Stanford School of Medicine, says the findings reinforce the ways that inflammation-fighting habits—from exercise to taking aspirin—could have a positive impact on a wide range of health problems. Inflammation and depression have a "complex relationship," Stafford adds. "Inflammation makes depression more likely, but depression itself may lead to unfavorable lifestyle changes that consequently increase inflammation." Aspirin can help break the cycle. In other words, it may encourage you to swim when you might otherwise sink.