A recent study from Spain finds "In comparison with people that did not eat yogurt, those who ate this dairy product regularly did not display any significant improvement in their score on the physical component of quality of life, and although there was a slight improvement mentally, this was not statistically significant," states López-GarcÃa. Most yogurt is pretty much pudding with a little bacteria . Pudding is a sugar bomb. Hard to believe the stuff doesn't improve health outcomes, isn't it? But as usual, researchers are calling for...more research. "For future research more specific instruments must be used which may increase the probability of finding a potential benefit of this food."
Do-it-yourself health. Low-carb, mostly evolutionary.
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Some things that helped me: no wheat or dairy (they make me congested), 10,000 IU per day of vitamin D (I believe this helped me beat back a relapse), and a course of antibiotics.
Some evidence for vitamin D protecting against colds and flu:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2870688/