I would only describe a meal as "good" if it was of good quality. It's possible to have more than enough of a bad meal. In the context you gave though, it seems to have more than one meaning. The "good meal" referred to leaves one both full and satisfied. I have a slight issue with that statement because, when referring to food, "full" and "satisfied" mean the same thing. On the assumption that the writer meant "happy" when he/she said "satisfied" then that particular "good meal" was supposed to be filling and of good quality.
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