There were no supermarkets, fridges or freezers during the time of castles. People mostly ate what they could grow or hunt nearby, like local fruit and vegetables.
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They did not enclose corn fields and cattle pastures inside the walls of a castle. Such walls would be too long and need too many people to defend. Most of the food during a siege came from supplies.
Castle toilets, also known as garderobes or latrines, would have a plank of wood with a hole held on stone supports through which waste could be deposited.
Why were farms placed outside castles instead of inside castles during medieval times? This was due to the added cost and labor involved in building fortified walls to enclose a large space, and the difficulties of defending a larger area.
After the 16th century, castles declined as a mode of defense, mostly because of the invention and improvement of heavy cannons and mortars. This artillery could throw heavy cannonballs with so much force that even strong curtain walls could not hold up.