geophagy Flashcards
what is geophagy
practice of eating soil or earth materials for nutrition or to suppress appetite
anthropological geophagy
evidence: white clay found along side bones of the Homo halibus (at kalambo falls near Zambia and Tanzania
contemporary geophagy
in Africa Kaolin is eaten. it is sold in the Cameroon markets and is flavored with spices. once again the largest demand comes from pregnant women.
ubt in Kenya, 73% of children(5-18) eat kaolin too
why might people engage in geophagy?
soils were thought of as nutrition and medicine
culture
to make themselves ills or commit suicide (very effective they needed to out makes on slaves to prevent them from doing it)
for pregnant women to have an easy delivery
what are the negative health effects of geophagy?
it coats in GI tract and increase absorption of toxins
and contain harmful parasites
lead to lead poisoning or other HM poisoning
where does it normally occur
in pre-industrial societies and poor villages.
the majority of people who partake are pregnant women too
what is pica?
the ED is characterized by the abnormal craving to ingest earth substances and non nutritive items
what did Vermeer suggest?
soil consumption is a normal human behaviour
south america geophagy
predominant in indigenous cultures
Gernam naturalist: alexander von Humboldt saw the otomacs near the orinioco river doing geophage, note that they were kinda picky, they would eat the smoothest clay they could find
now venezuela
Indonesia geophagy
in Indian archipelago of java they ate red square (iron rich) cakes called taanampo. could be oven baked or rolled into little cylinders
Africa geophagy
david livingstone saw that slave ate soil in Zanzibar. they carried this practice over the ocean.
what are the 8 big minerals? what do they do?
Phosphorous- help form bone. none=impaired growth
Potassium - a catalyst in protine synth and helps muscle contraction
Calcium- bone growth and muscle contraction. non+ rickets, osteomalaciacia or osteoporosis
Copper-binding O2 to hemoglobin, none= Anemia, slow growth, and depigmentation
Magnesium- protein synth and metabolism
, non-no growth
Manganese- enzymes catalyst and sexual development, non = no growth
Iron-hemoglobin synth, too muh= siderosis, none= anemia
Zinc- enzyme and metabolism and sexual development, none= no growth.