Updated: May 9
Add two things to your health regimen that boost your immune system: 1) deliberate cold exposure, and 2) Vitamin D.
Everyone knows that winter is "flu season," and most people think it's because the outdoor temperatures get cold.
But cold temperatures are not directly responsible for the annual spate of infections. In fact, exposure to cold air is a huge boost to the immune system. For example, a study conducted by the US and Canadian Armies found that deliberate cold exposure can more than double the number of natural killer (NK) cells in the bloodstream. These are the white blood cell that respond to and destroy infection, including viruses, bacterial infections, and even cancer.