This page will give you some ideas for researching this topic. Remember that you should always seek out reliable sources for information, but especially for health information.
TIPS:
You can use other resources, but be careful to check for accuracy, bias and currency. Is the site affiliated with a hospital, research organization, the government? It's probably OK. Is it a highly regarded newspaper (the Wall Street Journal, New York Times, etc) AND a recent article (last 10 years)? It's probably OK. Is it someone's health blog? Likely not OK. Is the site trying to sell you something, like a supplement? Likely not OK.