Final answer:
Individuals interested in how behavior is related to the body typically work in the fields of biological psychology or health psychology, where they study the influence of the nervous system on behavior and how physical health is interconnected with psychological and sociocultural factors.
Step-by-step explanation:
If someone is interested in the relationships between behavior and the body, they work in the area of biological psychology, which is also known as biopsychology or behavioral neuroscience. This scientific field examines how our biology—particularly our nervous system—affects our behaviors, emotions, and mental processes. Specialists in this field explore a variety of topics including sensory and motor systems, sleep patterns, drug use, ingestive behavior, and reproductive behavior, among others. Research often intersects with the understanding of physiological mechanisms of hunger and satiety, treatments for obesity, eating disorders, and studies into human sexuality including aspects of sexual orientation and gender identity.
We can also consider the field of health psychology, which falls under biopsychosocial model, focusing on how health is affected by biological, psychological, and sociocultural factors. Health psychologists might conduct research that looks at the relationship between one's genetic makeup, behavior patterns, and overall health. Moreover, the study of behavioral biology in broader terms includes neurodevelopment, the plasticity of the nervous system, and the biological correlates of psychological disorders, tying closely into evolutionary aspects and natural selection.