Whether you are sick with the flu or not, protein is always necessary to keep your body strong. Proteins are essential to help your body maintain and build strength. Lean meat, poultry, fish, legumes, dairy, eggs, and nuts and seeds are good sources of protein.The US Food and Drug Administration (FDA) recommend that adults eat 50 grams of protein per day. Pregnant and nursing women need more. By eating foods high in protein, we also get the benefit of other healing nutrients such as vitamins B6 and B12, both of which contribute to a healthy immune system.Vitamin B6 is widely available in foods, including protein foods such as turkey and beans as well as potatoes, spinach, and enriched cereal grains. Proteins such as meats, milk, and fish also contain vitamin B12, a powerful immune booster.Minerals such as selenium and zinc work to keep the immune system strong. These minerals are found in protein rich foods such as beans, nuts, meat, and poultry.

Can citrus fruit boost immune function?Flavonoids (or bioflavonoids) include about 4,000 compounds that are responsible for the colors of fruits and flowers. Findings show that flavonoids found in the soft white skin of citrus fruits increase immune system activation. Flavonoids are found in grapefruit, oranges, lemons, and limes.What other nutrients help fight infection?One nutrient that's found to strengthen the immune system so it can fight other infections is glutathione. This powerful antioxidant is most plentiful in the red, pulpy area of the watermelon near the rind. Glutathione is also found in cruciferous vegetables like kale, collard greens, broccoli, and cabbage.The most important point to remember about food choices is that a healthy well-balanced diet should contain a variety of foods. Relying on a single food or food group to provide adequate nutrition can be dangerous.