This article seems unusually misrepresenting of the theory of humours, which was prevalent in medieval Europe, at least in the catholic parts. This theory stated that no food was explicitly bad or good; rather, you should eat food that is suitable for your temperament. In that sense, they did not believe any food is necessarily (at least in terms of the humours) unhealthy; rather, it may be unsuitable or suitable for your temperament and the balance of humours within you. The hesistance of wet was mostly of its association with diseases; but it was recommended to cholerics, whose temperament needed to be balanced with it. In a sense, it sometimes produces better results (by chance) than modern dietary practices which often held up some types of (seemingly innocent food; like animal fats) to be categorically unhealthy.