hormone tampering
When you ingest a stomach hormone called ghrelin it causes your brain to respond to food the way junkies respond to drugs. You are filled with an intense desire for it, and eating it becomes far more memorable. Researchers at Montreal's McGill University studied people's reactions to food after they had ingested ghrelin, and discovered that it made them crave whatever food they were shown in pictures — even if they had just eaten. Drugs that tamper with ghrelin are just around the corner.
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