Expired rice is easy to mold, and a large number of bacteria in the air will enter the surface of rice and mold together with the nutrients contained in rice. No matter how you wash it, the bacteria inside can't be cleaned. If you eat such rice, all the bacteria will be absorbed into the human body, and after eating it, you will have diarrhea and vomiting, and even cause serious gastrointestinal diseases.

Expired rice is mainly black and dark. Therefore, we should stop eating rice in time after it expires and try to finish it before the shelf life, which is more conducive to our health.

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Tips for buying rice:

1. Look at the hardness: the hardness of rice is determined by the content of protein. The hardness of rice is stronger, the protein content is higher and the transparency is better. Generally, new rice is harder than old rice, low decimeter is harder than high decimeter, and late indica rice (japonica rice) is harder than early indica rice (japonica rice).

2, look at the white belly: there are often opaque white spots on the abdomen of rice. White spots are called heart white in the central part of rice and outer white in the outer abdomen. Belly white rice is low in protein content and contains more starch. Generally, rice with high water content, immature rice and immature rice after harvest has a big white belly.

3, look at waist explosion: waist explosion is caused by the loss of balance inside and outside after the rice grains suddenly appear heated during the drying process. Fried rice tastes rotten and endogenous, and its nutritional value is reduced. Therefore, when selecting rice, we should carefully observe the surface of rice grains. If there are one or more transverse cracks on the rice grain, it means that it is popcorn.

4. Look at the yellowing of rice grains: The yellowing of rice grains is caused by chemical reactions of some nutrients in rice under certain conditions, or by microorganisms in rice grains. The smell and taste of these yellow grains are very poor, so be sure to observe the number of yellow grains in rice when purchasing.

5. Look at the new era: the aging phenomenon of rice is serious, the color of old rice becomes darker, the viscosity decreases, and the original flavor of rice is lost. Therefore, we should carefully observe the color of rice grains. The rice with gray powder or white grooves on the surface is old rice, and the more it is, the older it gets.

6. Look at the label: When you buy rice, you should also pay attention to the contents marked on the package. For example, whether the product name, net content, names and addresses of manufacturers and distributors, production date and shelf life, quality grade, product standard number and special labeling contents are marked on the package.

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