Yogurt and fermented food

Yogurt is a milk product obtained by fermentation of milk specific micro-organisms, which shall be viable, active and abundant in the product Lactobacillus delbrueckii subsp. bulgaricus & Streptococcus thermophiles. There are a lot of varieties of yogurt on the market, depending of their manufacturing procedure and ingredients, added to plain yogurt before or after fermentation. The type of milk used (skimmed, semi-skimmed or whole), and eventually the addition of cream, will determine the final fat content of yogurt.