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Registered dietitiansWeight lossSports & athleticsPediatricPregnancyPrenatal & postpartumRenalDiabetesPCOSGI & gut healthCancerExplore All SpecialtiesFun fact: Eggnog dates back to medieval Britain, where it was called "posset" and was considered a drink for the wealthy since they were the only ones who could afford milk and eggs. The name "eggnog" is thought to come from the word "noggin" - a small wooden mug used to serve alcohol.