When I was younger and I got sick, my mother made me eat yogurt a lot, because of the little "yeast beasties," as she called them. Somehow, without knowing the exact details (what five year old does?) it was the miraculous cure.
Then, I became a vegetarian. I gave up yogurt (and any benefits that came with it) because most yogurts contained gelatin. Since then, when I've taken antibiotics, I've had to also take acidophilous to counteract the effects.
But fast forward to now. Yogurt is back in style for vegetarians and vegans alike. There are 100% vegan/gluten free/organic options like Nogurt, and vegetarian options that use living organisms to culture the yogurt, like Silk Soy Yogurt. I've even found some in the organic section of my larger, chain grocery store. Also available is So Delicious yogurt, which is made with coconut milk.
Why yogurt? First of all, it contains probiotics, which are great for helping your body keep up the "good bacteria" that it needs to stay healthy and function. Also, many vegetarian yogurts contain calcium, which is great for helping to prevent osteoporosis. If you chose a non-vegan yogurt (ie, one containing active cultures), you can help prevent and cure yourself of many health issues, from yeast infections to constipation.
Yogurt is good on its own, with fruit, alongside granola, and as an ingredient in many dishes. With new vegetarian and vegan yogurt options, why not give it a try?