Carrots are rich in beta-carotene, a precursor for vitamin A, which boosts production of infection-fighting cells.

Cranberries contain flavonoids and anticancer agents; they also help prevent urinary tract infections, ulcers, and periodontal disease.

Eggs are a great protein source; they’re also rich in vitamin E, an immune stimulant, and zinc.

Shiitake mushrooms contain immune-boosting compounds that are also thought to reduce cancer risk.

Strawberries contain a compound that combats carcinogens; strawberries may be especially protective against esophageal cancer.

Tea (including green, red, and black varieties) contains potent antioxidants and can help prevent heart disease, ulcers, and even dental cavities.