A growing body of research suggests that happiness can improve your physical health. Feelings of positively and contentment seem to benefit cardiovascular health, the immune system, inflammation levels, and blood pressure, among other things. Happiness has even been linked to a longer lifespan—providing more years to continue striving for fulfillment. Researchers found that different types of happiness have surprising different effects on the human genome. People who have high levels of what is called eudaimonic well-being—the kind of happiness that comes from having a deep sense of purpose—showed very favorable gene-expression profiles in their immune cells. They had low levels of inflammatory gene expression and strong expression of antiviral and antibody genes. People who have relatively high levels of what’s called hedonic well-being (as in hedonist)—the kind of happiness that comes from self-gratification—show just the opposite. Their genes had adverse profiles involving high inflammation and low antiviral and antibody expression. More tomorrow.