Oh pul-ease. Simple Pavlovian response to the taste by seasoned beer drinkers.
Try the same test with someone who has never tasted beer, and you won’t get the same brain response.
Beer does have interesting physiological effects. I read an abstract that described the stimulating effect of beer on gastrointestinal motility, the implication being that one can of cheap beer is less expensive than Miralax. The dopaminergic effect might explain why certain forms of tremor decrease w/administration of beer.