Yogurt is a great source of bone-building calcium, but its real strength lies in live beneficial bacteria, known as probiotics, that keep down the growth of harmful bacteria in your gut. Too many “bad” bacteria can lead to gastrointestinal and other health problems. Eating more yogurt could help with inflammatory bowel disease, ulcers, urinary tract infections and vaginal yeast infections, to name a few conditions. Getting plenty of “good” bacteria from yogurt is particularly important when you take antibiotics, which wipe out all bacteria, good and bad, in your gut. Probiotics also produce immunity-enhancing compounds and natural antibiotics that help reduce levels of nasty bacteria in the gut.