These nutrients play a role in immune health—

• Beta carotene
  Beta carotene is found in plant foods, such as sweet potatoes, spinach, carrots, mangoes, broccoli and tomatoes.
• Vitamin C
  Vitamin C-rich foods include citrus fruits, berries, melons, tomatoes, bell peppers and broccoli.
• Vitamin D
  Vitamin D is found in fatty fish and eggs. Milk and 100% juices fortified with vitamin D also are good sources.
• Zinc
  Zinc tends to be better absorbed from foods such as beef and seafood, but it's also found in plant-based sources, including wheat germ, beans, nuts and tofu.
• Probiotics
  Probiotics are good bacteria that promote health. You'll find them in cultured dairy products, such as yogurt, and in fermented foods, such as kefir and kimchi.
• Protein
  Protein comes from animal and plant sources, including milk, yogurt, eggs, beef, chicken, seafood, nuts, seeds, beans and lentils.