Tacuinum sanitatis

The Tacuinum (sometimes Taccuinum) Sanitatis is a medieval handbook mainly on health. It is based on the "Taqwim al‑sihha" ("Maintenance of Health"), an eleventh-century Arab work an health by Ibn Butlan of Baghdad. The text exists in several variant Latin versions. 
It describes in detail the beneficial and harmful properties of foods and plants. It explains the six essential elements for well-being:
"Tacuinum Sanitatis" says that illnesses result from imbalance of these elements.