Look at the packaging.

Look at the storage environment.

Look at character.

Smell it.

Taste.

Specific methods:

Look at the package:

First, check the food packaging to see if the shelf life has passed or is close to the shelf life.

Then, check the shape of the package Deteriorated yogurt will produce a lot of gas due to internal fermentation. If you see a bulging package, it means that the yogurt has gone bad. Don't drink.

Finally, check whether the outer packaging is damaged.

Look at the storage environment:

Check the storage state of yogurt. Yogurt is a very perishable food, especially in hot summer. Yogurt should be stored in the refrigerator or freezer between 2~6℃, and it should be carefully placed at room temperature. Check the shelf life Generally speaking, the shelf life of yogurt is 3~5 days.

Look at personality:

Qualified yogurt clots are uniform, delicate, uniform in color, without bubbles, and there may be a small amount of whey (clear watery liquid) on the surface; Deteriorated yogurt, some of which do not coagulate into lumps, is in a liquid state, especially with a layer of water on the surface. Some have bubbles, and the color turns dark yellow or green (note: different colors will appear due to the different ingredients added in the existing mixed yogurt such as fruity yogurt, so pay attention to the distinction).

Smell it:

Qualified yogurt has a light smell and a milky smell; Deteriorated yogurt has a strong sour taste or alcoholic fermentation taste and musty taste, which is also easy to distinguish from the sense of smell. It is better to smell it from the place where the bottle is packaged, which is more obvious.

Taste:

You can taste a little if you can't smell it. Deteriorated yogurt will turn sour, and the taste and texture are not smooth. If you drink it regularly, you will feel obviously different.