Listen in as Dr. Mike provides the answers to a wealth of health and wellness questions. Here you'll find the answers to a wealth of health and wellness questions posed by Healthy Talk fans. Listen in because what you know helps ensure healthy choices you can live with. Today on Healthy Talk, you wanted to know:Is xylitol safe?Xylitol is a sugar alcohol found in fruits and vegetables. However, we don't really know if it's safe or not. It's probably fine in small amounts (as is any food), but the problem society has is overdoing on portion or serving sizes. Researchers are working on determining the safety of large quantities.My mom and older sister developed Multiple Sclerosis (MS). Our family doctor is concerned because he says there's a genetic link. What can I do to protect myself?MS is a neurological disease that directly affects the central nervous system and limits your ability to control your own body.Vitamin D is very important for your nerve health. In fact, in a study published in The Journal of the American Medical Association, those with the lowest vitamin D levels were 62 percent more likely to develop MS and have worsening symptoms of MS.Dr. Mike suggests having your vitamin D levels tested. Depending on what your test results are, you should talk to your doctor about the benefits vitamin D has on MS. You might even want to suggest to your mom and sister about getting their vitamin D levels tested as well. According to a study published in the Annuals of Neurology, for each four nanogram per mil increase in vitamin D levels, the risk of MS relapse was reduced by 12 percent.If you have a health question or concern, Dr. Mike encourages you to write him at askdrmikesmith@radiomd.com or call in, toll-free, to the LIVE radio show (1.877.711.5211) so he can provide you with support and helpful advice.