Do hormones affect behavior?
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Endocrine functions and hormones interact with every other organ system in the human body. Individuals whose hormone levels are abnormal, either due to oversecretion or undersecretion of a particular hormone, will show signs of abnormal behavior and illness. Children whose sex hormones are produced at an early age, for example, may demonstrate aggressive and assertive behavior in addition to the physical characteristics of maturation. In adults, changes in hormonal levels may have significant effects on intellectual capabilities, memory, learning, and emotional states.