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If we were able to bend Galenic theory for the purpose of justifying social inequality, then perhaps we can also use it to justify geographic differences in what people eat? In the Middle Ages, people throughout Europe were trying to eat according to the same ancient nutritional doctrine which they read quite literally. But eventually those in the north realised that Hippocrates and Galen had lived in the Mediterranean basin. Why assume that what was good for them is also good for those living in other climate zones? Northerners, after all, have different temperaments than the southrons, so it's only natural that they should follow a different diet than the Greeks and Romans did. But how do you know what is good for the northerners? Well, it's simple: whatever food their organisms have got used to over the centuries. In other words, if there's something a given nation really likes to eat and drink, then this is what is healthy for them. Perhaps wine was good for Galen, but the Dutch are more suited to drinking hoppy beer; ancient dietary experts may have preferred tender veal over beef, but beef and mustard work better to offset the cold climate of the English; and the Scots, living in harsher climes still, may even safely consume oatcakes, even if these would surely make everybody else sick. It's due to this great splendid discovery that separate national cuisines could arise in Europe.
What else can we justify with humoral dietetics? Let's see… What about religious fasting? Have you ever wondered why eating meat is forbidden during a Catholic fast? Well, that's because red meat heats your body and strengthens then choleric and sanguine humours, which are conducive to promiscuity and other sinful carnal pleasures. Fish, on the contrary, cool cools your body down and temper tempers your proclivity to sin, which is why it is allowed during lean periods. Such periods include Lent, Advent and the eves of various holidays, as well as so-called Ember Days, which include three days (Wednesday, Friday and Saturday) in each quarter of the year. It would be difficult to find a theological or liturgical rationale for these quarterly fasts, but what you can find is a humoral reason.
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