Dietetics, medicine, healthness are the main topics of this work concerning the analysis of medieval medical literature. In particularly, the present research treats of regimina mensium, a calendar “genre” which includes prose and verse writings, dated from the early Middle Ages up to XV century and spread over western Europe. In this kind of manuscripts dietetic prescriptions, cookery recipes, pharmacological drinks are advised in order to maintain good health. Hippocratic doctrine and everyday life are mixed together and conceived in every single monthly precept. It is difficult to say exactly who consulted texts of that sort. It is attested, however, that the most part of them was copied in monasteries of western Europe, especially during the early Middle Ages. Sentences’costruction, texts’ format (for every month a special recipe or prescription is given) and, moreover, their simple and short content suggest that the regimina mensium were not especially addressed to professional people, supposed to know the principles of medical theory, but to common people. This idea would be supported by the developpement of similar textual typologies during the Middle Ages, such as the poem regimen sanitatis of the school of Salerno and other medical works, chiefly oriented to the practical aspects of medicine. In those texts advise and remedies were often presented as proverbs or simple rules of healthness to follow in everyday life. The same kind of knowledge was transmitted through popular almanacs from the XVI century up to the XIX (even XX) century. It is a literature which deals with detailed monthly information concerning various domains of human life, among which medical prescriptions. In this perspective, medieval regimina mensium could be considered the precursors of popular almanacs, at least as concerns dietetic aspects.