Probiotics occur naturally in many foods. The most popular source in the Western diet is yogurt. Here are 10 proven ways yogurt can boost your health.  

The human gut contains several thousand strains of bacteria and every person has a different mix.  Some are beneficial, some are just there for the ride, and some can become problematic. When the balance between "good" and "not so good" bacteria is disrupted, lots of things can go wrong from the immune system, to digestion, to mental health.