White blood cells, also known leukocytes, are necessary because they help fight infection. If there’s a low number of white blood cells, it could be due to liver disease, the absence of a spleen, or bone marrow failure. There are several drugs that can be used to raise the number of white blood cells, as well as a number of alternative methods.

Things You'll Need

Reduce your intake of sugary and fatty foods. Sugar decreases the strength of white blood cells.

Drink eight glasses of water a day. Not only does water flush toxins from the body, it may also help strengthen your immune system.

Exercise three to five times a week. Exercise relieves stress, which hurts your white blood cell count. It also helps to keep you at a healthy weight, which helps the body fight infection.

Incorporate carrots, leafy greens, yogurt and kale into your daily diet. All of these foods contain beta carotene, which increases your number of white blood cells.