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.
The flu delivers a punch powerful enough that many people want to take to bed for a few days. Again, fever and severe symptoms are strong signs that you're too sick to work and should stay home. The flu usually goes away in seven to 10 days in otherwise healthy people, although they may still have a cough and feel tired when they return to work. Although most people will need a few days off to recuperate, they can go back to the workplace 24 to 48 hours after their temperature has returned to normal.