It can be found in some animal-based foods in its pre-made form, or found in plants in the form of beta-carotene -- a compound your body digests to form two vitamin A molecules. Yellow and dark green vegetables and fruits are good sources of the carotenes, including beta-carotene.
With the flu, you may feel very weak and fatigued for up to two or three weeks. You'll have muscle aches and periods of chills and sweats as fever comes and goes. You may also have a stuffy or runny nose, headache, and sore throat.
So if you're around somebody who has the flu and the next day you feel pretty good, you're not out of the woods yet. You can actually develop symptoms up to four to five days after being exposed to somebody who has the flu. Next: For How Long Am I Contagious After Being Infected By The Flu?