Just wanted to bring up something very dear to my heart and lifestyle. I bet you didn't realize one of the best things you can do to keep yourself healthy and immune system running at optimum levels is free and available to everyone.
Moderate exercise has been linked to a positive immune system response and a temporary boost in the production of macrophages, the cells that attack bacteria. It is believed that regular, consistent exercise can lead to substantial benefits in immune sytem health over the long-term.
A simple case study: A couple of years ago, well a little more than a few I was a bit of a large kid. I enjoyed the sweets very much and it showed

. But the point is I never felt so tired and sick in my life than that period of time ever. One day I just got tired of it all and that's when I started my journey into a more healthy lifestyle and ways. I became a trainer and studied nutrition. I almost changed over night, i could feel the difference in just getting my body in motion. Everyday I felt more healthy and had a new bounce to my step. I could go on for days talking about this. But the bottom line is this, if you can incorporate some exercise in your life the dividends will pay off for a lifetime.
Take from a former heavy guy, even a little exercise will go a long way in making you a much more healthy individual.