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Brain responses to anticipation and consumption of beer with and without alcohol

Brain responses to beer and non-alcoholic beer (NA-beer) have not been compared before. Researchers hypothesised that the flavour of beer constitutes a conditioned stimulus associated with alcohol reward. A research team investigated whether oral exposure to NA-beer with or without alcohol elicits similar brain responses in reward-related areas in a context where regular alcoholic beer is expected.

21 Healthy men who were regular beer drinkers were scanned using functional MRI. Participants were exposed to word cues signaling delivery of a 10-ml sip of chilled beer or carbonated water (control) and subsequent sips of NA-beer with or without alcohol or water (control). Beer alcohol content was not signaled. The beer cue elicited less activation than the control cue in the primary visual cortex, supplementary motor area (reward-related region) and bilateral inferior frontal gyrus/frontal operculum. During tasting, there were no significant differences between the 2 beers. Taste activation after swallowing was significantly greater for alcoholic than for NA-beer in the inferior frontal gyrus/anterior insula and dorsal prefrontal cortex (superior frontal gyrus). This appears to be due to sensory stimulation by ethanol rather than reward processing.

In conclusion, the researchers found no differences in acute brain reward upon consumption of NA-beer with and without alcohol, when presented in a context where regular alcoholic beer is expected. This suggests that in regular consumers beer flavour rather than the presence of alcohol is the main driver of the consumption experience.

Source: Brain responses to anticipation and consumption of beer with and without alcohol. Smeets PAM, de Graaf C. Chem Senses. 2018 Nov 13.

doi.org/10.1093/chemse/bjy071
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