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The development of intravenous nutrition that enables patients to survive for months or years, even when they are completely dependent on it, should be considered one of the major medical advances of the 20th century. Until intravenous nutrition was developed about 40 years ago, there was little hope for patients with major loss of intestinal function. Perhaps this is not surprising, since there are as many as 35 essential nutrients that we unwittingly ingest that need to be artificially introduced to the body when the gastrointestinal tract fails to work.
The gut is extremely complex. There is more lymphoid tissue
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