This has interesting implications for Americans, most of whose
ancestors immigrated from somewhere else; many of our ancestors also
"hybridized" or crossed with immigrants from elsewhere. Trying to
discover what dietary substances your particular genetic endowment
is adapted to can be difficult and confusing. If both your parents
were Italian and they were more or less pure Italian going way back,
you might start out trying to eat wheat, olives, garlic, fava beans,
grapes, figs, cow dairy. If pure German, try rye bread, cow dairy,
apples, cabbage family vegetables. If Scottish, try oats, mutton,
fish, sheep dairy and cabbage family vegetables. If Jewish, try goat
dairy, wheat, olives and citrus. And certainly all the above ethnic
derivations will thrive on many kinds of vegetables. Afro-Americans,
especially dark-complexioned ones little mixed with Europeans, might
do well to avoid wheat and instead, try sorghum, millet or tropical
root crops like sweet potatoes, yams and taro.
Making it even more difficult for an individual to discover their
optimum diet is the existence of genetic-based allergies and worse,
developed allergies. Later in this chapter I will explain how a body
can develop an allergy to a food that is probably irreversible. A
weakened organ can also prevent digestion of a food or food group.
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