Fermentation converts the lactose to lactic acid, which has a sour flavor. Before the invention of refrigeration, raw milk commonly became sour before it could be consumed, and various recipes incorporate such leftover milk as an ingredient.

Can you ferment milk into alcohol?

Kumis is a dairy product similar to kefir, but is produced from a liquid starter culture, in contrast to the solid kefir “grains”. Because mare’s milk contains more sugars than cow’s or goat’s milk, when fermented, kumis has a higher, though still mild, alcohol content compared to kefir.

Is fermented milk healthy?

Early research suggests that drinking fermented milk containing multiple types of bacteria reduces constipation in women. But other research suggests that fermented milk is no better than regular milk. Heart disease. Men who consume more fermented milk products seem to have a lower chance of developing heart disease.