Now I am confused.

What about these sentences?

I am happy to say that everyone in my family felt good/well after eating my meal.

Is it well because it is an adverb that describes felt?

You could say they felt well -- to indicate that they didn't become ill.

You could say they felt good -- to indicate they enjoyed the meal.

This site may help you.

http://englishplus.com/grammar/00000218.htm

Yes, you are correct! In the given sentence, "well" is used as an adverb. It describes the verb "felt," indicating how the action of feeling was performed. The word "well" here means in a good or satisfactory manner. So, it explains how everyone in the family felt after eating the meal.

To identify whether "well" is an adverb or an adjective, you can consider its position in the sentence and the role it plays. Adverbs typically modify verbs, adjectives, or other adverbs. In this case, "well" is modifying the verb "felt," so it functions as an adverb.