When it comes to vitamin C, many people think of oranges. However, strawberries and kale are also bursting with the vitamin and can be a good addition to health-boosting meals. For tasty treats, kids can enjoy these recipes from nutritionist Joy Bauer. For a yummy smoothie, combine one banana with some strawberries, kale, blueberries and milk. Blend it up and serve. Broccoli is another good cold-buster that can be put in guacamole. These foods are delicious and can also help ward off the flu.