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Intestinal absorption at high altitude.
  1. I. M. Chesner,
  2. N. A. Small,
  3. P. W. Dykes
  1. Department of Medicine, East Birmingham Hospital, UK.


    Three tests of small intestinal function were performed at 3100 m and 4846 m to seek evidence of malabsorption of high altitude. Xylose tolerance did not change in 11 subjects but, in three who ascended to 5600 m, one-hour xylose levels were significantly lower. The results of an oxalate loading test did not suggest significant fat malabsorption. A direct fat absorption test using chylomicron levels after ingestion of 100 g fat showed significantly increased levels at high altitude. We conclude that there is no evidence of malabsorption up to 4846 m.

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