Tomatoes have a very high vitamin C content and contain all the major carotenoids (alpha- and beta-carotene, lutein, and lycopene). Carotenoids, which are known to be essential for healthy eyesight, are shown to stimulate the immune system, reduce cancer risk, and slow aging.
2. Whole Grains
According to The American Journal of Clinical Nutrition, whole grains help decrease inflammation and manage digestive system bacteria. Much of the immune system is affected by the digestive system, so whole grains boost the body’s disease-fighting abilities. Incorporating whole grains into the diet can boost the immune system and also improve digestion.
The old saying “an apple a day keeps the doctor away” is pretty close to the truth. Apples are high phytochemical antioxidants that stimulate immunity and reduce the risk factors for many chronic diseases. Apples are also high in fiber, which lowers the risk for cardiovascular disease and decreases inflammation. Fresh apples are typically more preferable than apple juice, as juices are often high in sugar and low in nutrients.