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Raw Fruit

Question: Did medieval people believe that eating raw fruit would make them sick?

There are some references in medieval texts that do suggest this, but there are also references to serving raw fruit. Some medical researchers are now suggesting that bacteria on raw fruit could have been responsible for an ailment common at the time - the flux.

Source (Primary): The Book of Kervynge

.. beware of grene sallettes & raw fruytes for they wyll make your soverayne seke, therefore not moche suche metes as wyll set your tethe on edge therefore ete an almonde & harde chese, but ete not moche chese without romney modon.

Note that the above quote demostrates that there was such a belief, but since the advice is being imparted it implies that the belief was not universal.

Source (Secondary): Ouverture de Cuisine, D. Myers (trans.)

Fourth service.
Large gilded marzipan. Genua pie.
Liquid sweets. Sugared waffles
Quince pies. Roman pipes.
White marmalade. Clear white jelly
Pistachine. Royal tart.
Long pipes. Orange pie.
Almond lard. May butter.
Wafers. Clear red jelly.
Sugared almonds. Apple pie.
Candied cinnamon. Moustacholle.
Dried sugar. Bugnole fritters.
Sugar pies. Samblette.
Palamitte. Molded marmalade.
Cream tart. Fish preserves.
Orange preserves with flowers.
Ice jelly. Offal puffs.
Large sugared biscuit, Eel fritter.
Sugared crenelle. Large castelin.
Candied capers. Candied pears.
Snow on rosemary. Raw apples [emphasis added].
Anise. Parmesan. Hungarian candied
prunes, puff cakes. Chestnuts.
Morquin. Rosquille. Biscotelle.