Exercise and nutrition aren’t just important for physical health— they both play a big role in mental health, too. Studies show that people who exercise regularly report having 1.5 less days of poor mental health compared to those who don’t exercise. Even walking can lessen the number of poor mental health days by 17%. With 95% of serotonin (a chemical that affects mood, sleep, digestion, and more) being created in the gut, it’s no wonder that a nutrient-dense diet plays a role in a person’s mental health. Likewise, mental illnesses like anxiety and depression have been linked to higher risks of diseases that affect our physical health such as diabetes, asthma, cardiovascular disease, and more. Here are a few ways fitness and nutrition affect mental health.