BBC Earth (Asia) - - Science -

Po­lar bears are top carnivores that bioac­cu­mu­late the vi­ta­min A pro­duced by marine al­gae lower down the food chain. Be­cause vi­ta­min A isn’t wa­ter-sol­u­ble, it can’t be eas­ily flushed from the body and is stored in the liver in­stead. Bears and seals have gen­er­ally high lev­els of vi­ta­min A in their liv­ers but po­lar bears have the most of any an­i­mal. The rec­om­mended daily al­lowance (RDA) for vi­ta­min A in hu­mans is 0.9mg, and you can get that from eat­ing just one-tenth of a gram of the liver from a well-fed po­lar bear. The en­tire liver con­tains enough vi­ta­min A to kill as many as 52 adults! If you spread it out and ate

just enough to get your RDA ev­ery day, that liver would last you 143 years!

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