Yogurt products are categorized into two types, curdled and stirred, and old yogurt belongs to the curdled type while regular yogurt belongs to the stirred type. The two types of yogurt differ in taste due to different production methods. The difference between old yogurt and regular yogurt is the production process. Old yogurt is made by putting strains of bacteria into milk at the right temperature and stirring it well, then dispensing it into cups and putting it into a fermentation box. After a certain time of fermentation, the yogurt comes out in a solidified state and can be eaten by digging in with a spoon. Regular yogurt is fermented at a low temperature, then the fermented solid yogurt is stirred and canned.

■Nutritional Comparison

In the ingredients column, the two kinds of yogurt in the raw milk, sugar, colony name are the same, just food additives, "old yogurt" than ordinary yogurt more pectin, gelatin, agar and carrageenan. Gelatin is generally extracted from animal skin or bones, pectin is mainly from orange peel and apple juice residue, agar and carrageenan is an extract of seaweed. If a lot of thickeners are added to old yogurt, the milk proteins will clump together and look a bit hard. And when less is put in it will precipitate a watery, light green whey like tofu brain. Pectin, gelatin are natural extracts, will not harm the human body, according to national standards as a food additive can be added to dairy products as a thickener. Gelatin, pectin is basically carbohydrates, itself has no nutritional value, added will not increase the nutritional value of old yogurt. The protein content of individual brands of old yogurt is 5%, while the protein content of ordinary yogurt is generally 4%, the protein content of the two is only 1% difference. The nutritional value of old yogurt and regular yogurt is about the same. Old yogurt mainly tastes good and highlights the classic flavor of Chinese tradition.

■Price Comparison

Old yogurt per box of 160 grams of prices mostly in the 4-6.5 yuan, while most of the same weight of ordinary yogurt in the 2-3.2 yuan, the price of ordinary bags of yogurt to be cheaper, the net content of 160 grams of plain yogurt priced at 1.5 yuan / bag, the most expensive bags of 160 grams of yogurt priced at only 2 yuan / bag. The average selling price of a bowl of old yogurt is usually double the price of a regular bag of yogurt.

It can be seen that old yogurt is based on ordinary yogurt, artificially added gelatin, agar, carrageenan, pectin and other food thickeners. Strictly speaking, the old yogurt should be called "yogurt jelly", did not increase the nutritional value of yogurt, neither more health care bacteria, nor more nutrients. Today's old yogurt is not only the quality of raw materials and traditional old yogurt compared with no improvement, and may even be reduced. This is because traditionally the milk ingredients used to make yogurt had to be higher in protein, lower in antibiotics, and lower in stray bacteria in order to make a smooth yogurt curd. And now with the help of food additives, even if the raw material protein content is low, but also does not prevent made into a frozen state, the raw material requirements instead of reducing.