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:Which is better, Vitamin C or D?Your immune system is SO important for longevity. Researchers are now understanding just how important your immune system is. However, Dr. Mike doesn't want to say one vitamin is more important than the other, since they are both essential.Vitamin D, also known as the sunshine vitamin, is a group of fat-soluble secosteroids, which enhance intestinal absorption of calcium, iron, magnesium, phosphate and zinc. Vitamin D is very important in managing your immune response.Vitamin C protects your body against immune system deficiencies and cardiovascular disease and also fosters prenatal health, eye health and skin health.What's your take on the failed fast food ban in Los Angeles?According to an article in the L.A. Times, seven years ago L.A. decided to do something drastic in order to reduce obesity rates in south L.A. However, this ban failed to reduce overweight and obesity rates in these neighborhoods and actually increased these numbers. Dr. Mike thinks that everyone is starting to understand how addicting and bad fast food places can be. However, this doesn't prevent new fast food restaurants from popping up and certainly isn't keeping people from eating unhealthy foods, especially without any access to healthy and fresh foods. 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 (1.844.305.7800) so he can provide you with support and helpful advice.