quoting
http://www.ccfa.org/medcentral/research/clinical/intbact.htm

"Dr. Bengmark explains that prehistoric food contained
several thousand times more bacteria, mainly
probiotic, but today's diet contains many threats to
gut flora. "...The desire of the food industry to
prolong shelf life promoted alternative production
methods such as the use of enzymes instead of live
bacteria. Combined with extensive hygiene measures
practiced during delivery and in child care, children
in Western societies may have difficulty developing a
satisfactory protective indigenous gut flora." Medical
treatments such as antibiotics and radiation also
affect the gut's natural environment."


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