Whitish fluid with a milky look, first described by Gaspare Aselli (1627). Drained by chyliferous vessels, it originates from intestinal villi. Chyle differs from peripheral lymph over its rich content in lipoproteins, which, for their weight and size, cannot enter into blood, but only into lymphatic capillaries. Glycerol, medium and short chain fatty acids, and steroids are drained by the portal venous system. For this reason, many patients who also show a concurrent chylous component – for example those affected by « reflux» disorders – are given a diet without complex fats, while the use of MCT Oil is recommended, that is oil containing only medium chain triglycerides, which are mostly drained through portal circulation.