Because that is the way it has been for centuries; there wasn't any other way available to keep food warm on the plate.
Yes, you can put ceramic plates in the oven for baking or heating food. Just make sure the plates are oven-safe and not too cold or hot when placing them in the oven to prevent cracking.
Sure. Ice Cream is cold food, cheeses are cold food. There are some people who enjoy cold pizza the day after.
Eating unhealthy food will not cause you to get a cold. Viruses cause people to get a cold.
Bowls with plates on top.
In Bangladesh people Usually eat their food in individual plates.
To keep food cold that needs to be kept cold.
Yes, heat retentive plates, keep warm plates, etc.
Food plates can be made from glazed ceramics or plastic.
A regular diet
Astronauts eat regular food, it is just that the food floats around and people call it, space food
Plates and bowls lol, What most people eat food on.
because they like cold food.