A member asked:

Are there specific hungers that help you fill a need in your diet?

A doctor has provided 1 answer

Yes: Deprivation of certain food products causes an increase in appetite for the needed substance. The term used is "specific hunger behavior" which has been proven with substances like salt, calcium, fats, proteins, and certain vitamins. Take the example of pica where the appetite for iron can be so strong it forces the child to eat rocks, dirt or clay.

Answered 3/12/2015

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