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This article is from the Food Science FAQ, bypking123@sympatico.ca (Paul E. J. King) with numerous contributions by others.
Food scientists and technologists in industry take great care to
try to ensure that food products are safe and wholesome. It is
probable that increased food poisoning statistics are due to a
combination of the following factors:-
1) increased public awareness, so that large numbers of
previously unreported 'stomach upsets' are now increasingly reported
as cases of food poisoning;
2) changing lifestyles, including changed shopping habits --
shopping less frequently in larger amounts and consequently storing
food for longer periods;
3) the increased marketing of chilled prepared dishes, which
need shorter times between purchase and consumption and more
carefully controlled low temperature domestic storage than many
people have understood or provided;
4) the emergence of some hitherto unknown or new strains of
micro-organisms.
 
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