Sugar impacts your white blood cells by competing for space in those cells with Vitamin C. When Linus Pauling did research in the 1970s to find out how the body uses Vitamin C, he discovered that white blood cells need Vitamin C to destroy bacteria and viruses. Sugar and Vitamin C are similar in their chemical structure. When you eat sugar, it directly competes for space in your immune cells with Vitamin C!The more sugar in your system, the less Vitamin C can get into your white blood cells. Sugar DOES NOT help your immune system fight infection at all, resulting in a weakened defense from infections.