People usually don't have high expectations from fast food restaurants. Hot and delicious will do.

But some chain restaurant foods are bad enough for employees to warn you to stay away.

A recent Reddit thread explored the worst ordering decisions at restaurants including McDonald's, Subway and KFC.

Some of the foods are very high-calorie, while others are made under allegedly unsanitary conditions.

Employees also gave tips on which foods are fresh and which aren't.

Their opinions might sway your next fast food order.