A healthy diet doesn't just boost your immune system, it also helps you recover quicker when you're sick with a cold or the flu. Because your body is expending energy to help you heal faster, fueling it with healthy, nutritious foods is essential. Here are some of those foods that will help you get on the mend sooner than later.

Protein

The important thing to remember here is easily digestible protein. When you're sick, your body may not be up to a protein-packed steak. But easily digestible, easy to fix proteins, such as yogurt or eggs, will do the trick.

Note: In one study, it was shown that the probiotics in yogurt shortened colds and flu by nearly two days. Be sure to choose those that contain Lactobacillus casei or Lactobacillus reuteri. Also, Greek yogurt includes a healthy dose of protein.

Citrus Fruit (Flavonoids)

What are flavonoids? They're found in the soft white skin of grapefruit, oranges, lemons and limes, and increase immune activity. They also have anti-inflammatory health benefits. Vitamin C may not actually shorten the length of your illness, but that's no reason to ignore citrus fruits.

Soup And Broth

Just like your mother (or grandmother) told you, soup and broth can be just what the doctor ordered when you're not feeling well. Clear broths like chicken or veggie broth will not only keep you hydrated, but are also easy to digest. Soups that contain vegetables and grains such as barley will have added vitamins and nutrients. Moreover, the hot liquid will ward off the chills and open up sinuses.

Glutathione

Put glutathione up there with flavonoids when it comes to helping you get over the crud. Found in watermelon and veggies such as kale, cabbage, collard greens and broccoli, glutathione is a powerful anti-oxidant. Still not convinced? Glutathione has also been shown to fight aging, heart disease, cancer, dementia and more.

Foods With B6 And B12

Vitamins B6 and B12 are considered healing nutrients and you can get your fill of them in a variety of foods: milk, fish, fortified soy milk and cereals, potatoes, turkey, spinach and nutritional yeast.

Physical fitness can also ward of sickness. Working with a personal trainer like Ralph Roberts can not only help you find the best health and fitness program for you, but can also help you more easily meet your goals. Get a head start on your fitness goals now by signing up for a group training class on Jan. 9.