Hunger is more complex than “food in my stomach.” The feeling of hunger is closely tied to a variety of signals from the body including blood sugar, food in the stomach, seeing / smelling / tasting food, but also a series of pleasure and reward chemicals in the brain.
Put more simply, seeing someone pleasurably smoke a cigarette in a movie makes me crave a cigarette. As I get out a cigarette, light it, smell it, taste it, and inhale my brain floods itself with pleasurable reward chemicals. At no point in this process did I *need* that cigarette biologically, it’s just a input/output feedback system.
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