Tartar, whether meat or fish - usually beef or salmon - is a popular choice for consumers. As a result, tartar is now everywhere: on supermarket shelves, in starred restaurants, in brasseries, on family tables. But eating only raw food (meat or other foods) can also have consequences for the digestive system. And while the fashion for raw and tartar can be energetic and tasty, it can also be damaging and even dangerous. An investigation by Lolita Rivé and Elise Casta-Verchère.