Abstract: The invention concerns a special dairy food composition consisting of processed mammal milk (that is having been subjected to a substantial modification of its original state) by acidification at pH less than 5.2 either by lactic acid fermentation or by direct input of lactic acid and antacid substances containing magnesium in the form of magnesium oxide or magnesium hydroxide or magnesium salts of weak organic or mineral acids or a mixture thereof, the final pH of the composition ranging between 4.5 and 7.5 and the total amount of magnesium contained in the composition ranging between 10 and 3000 milligrams per litre.