Answer the following questions about price elasticity of demand. 
Definitions:
Dietary Modifications
Changes made to one’s diet in order to improve health, manage allergies, or accommodate medical conditions.
Vitamin Supplements
Products taken orally that contain one or more vitamins or other nutrients intended to supplement one's diet.
Nitrogen Balance
A measure of the balance between nitrogen intake and nitrogen excretion, indicative of the body's anabolic or catabolic state.
Tissue Growth
The process of cellular multiplication or increase in the size of tissues, which can be normal or pathological, such as in tumor development.
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