Temporarily avoiding food improves immune response. A fever is part of how the body fights
infection. It is thought that loss of appetite is in this way part of the body's natural infection-fighting process. So the best advice is indeed to avoid eating temporarily when one has a fever and a loss of appetite. A cold in contrast typically has no fever, and appetite is not diminished. However to prevent dehydration keep drinking lots of water.
http://www.newscientist.com/article/dn1777-feed-a-cold-starve-a-fever-may-be-right.html
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