7 Foods to Eat When You're Sick

In a German study, the probiotics in yogurt were found to shorten colds and flu by almost two days. Choose ones that contain the bacterial strains Lactobacillus casei or Lactobacillus reuteri, since these two are the ones linked to improving immune response. Greek yogurt is a great option since it also contains at least 10 grams of protein per serving.