Question

Why is it better to eat food that has been covered versus food that has been uncovered?

Answer 1

Because usually when the food is uncovered or not preserved sufficiently, it becomes contaminated with germs i.e bacteria, fungi etc.

Explanation:

So when we eat this kind of food, these germs take their way to our stomach, they reside there and start to perform their task. And their task is to make an active and agile person feel sick by causing diseases(diarrhea, stomach ulcers etc) in him.
In brevity: Uncovered food`=`Disease causing agent

That's why it's better not to eat food than to eat the uncovered one

Hope it helps...