Sugar
Many studies have shown that sugar is harmful to the immune system. Specifically, this ingredient would inhibit a main part of the complicated immune response, which subsequently slows down the activities of the white blood cells that target viruses in the body. Therefore, people with a shingle outbreak should avoid the consumption of sweetened products, such as pastries, candies, sodas, and other foods with added sugars. Read the food labels carefully and avoid those with too much sugar content in the ingredient list. Natural sugar in fruits is totally fine. [6]
