The aphorism "everything in moderation" is useful only because it doesn't specify what amount would be acceptable as moderation. Is having a slice of bread a da

The aphorism "everything in moderation" is useful only because it doesn't specify what amount would be acceptable as moderation. Is having a slice of bread a day considered moderation? What about five slices? Is having 10 grams of sugar a day moderation? What about 50 grams? The meaning of "moderation" is conveniently unclear.