One effect of weight-loss surgery is a change in food preferences. An analysis in rats shows that this is caused by altered nutrient signals in the intestine. These activate the vagus nerve to increase signalling in the brain by the neurotransmitter dopamine.
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Sandoval, D., Seeley, R. Gut feeling for food choice. Nature 542, 302–303 (2017). https://doi.org/10.1038/nature21499
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DOI: https://doi.org/10.1038/nature21499