Little bitty kids don't really know how to say they are feeling nauseous.
Intense feelings of guilt for insisting that they try just one bite of food.
Adult gets to experience, first hand, the same virus.
When a 2+ year old sits at the dinner table in a pleasantly warm house, says he's cold and refuses to eat. He just might be sick... very soon.
They get sick, you get sick. Get over it. Besides, you are lucky when only one at a time is sick. When they are both sick at the same time it is exponentially worse.