You need to be very careful when shopping in the supermarket, especially what bulk food is easy to buy and what unhealthy food is harmful to your health after eating it. So, what food should you not buy in the supermarket? What should I pay attention to when buying bulk food? Let's learn more about the precautions for going to the supermarket to buy food.

1, not bulk food bought in the supermarket.

1. cereal

Bulk grain is easy to breed germs and the loss of nutrients is also great. Because grains contain water, relatively humid environment will lead to the growth of germs. Among them, the most harmful to human body is a carcinogen-aflatoxin.

Among cereals, brown rice is the least suitable for buying in large quantities. Although it is nutritious, its shelf life is very short, usually only half a year. Especially vitamin A and vitamin C, if left in the air for about 3 months, they will be completely oxidized and the health care effect will be lost.

2. Edible oil

Most of the bulk edible oils are "three noes" products with no factory name and address, no production date and shelf life, and no quality standards. There are serious health hazards, so don't buy it. In particular, it is unacceptable to buy a large amount of edible oil at one time.

This is because, first of all, the opened oil is usually stored in the kitchen, with high temperature and humidity, which is easy to breed bacteria; Second, the oil in the oil is prone to oxidative rancidity, which will increase the risk of cancer. Therefore, Wang Donglan suggested that edible oil should be purchased in small packages and eaten within 3 months after opening the lid.

nut

Nuts go bad easily because they are high in oil. Direct contact with air will not only accelerate the deterioration of bulk nuts, but also make them more likely to lose mineral nutrients such as calcium, zinc and iron. Therefore, the shelf life of bulk nuts is usually only one or two months. It is best to buy nuts in small packages, which can be eaten in a short time.

4. Frozen food

Don't think that frozen food can be kept for a long time without scruple. Its shelf life is actually only one or two months. It is not easy to judge the transportation and storage time of a wide variety of frozen foods in supermarket freezers. Therefore, no matter how busy you are, don't let frozen jiaozi and frozen meat fill the refrigerator. It is best to buy and eat frozen food now.

5. Seasoning products

Whether it is bulk pepper, cumin or bottled Chili sauce, the taste will become weak in about half a year, the seasoning ability will be weakened, and bacteria will easily breed, which is very harmful to health. Condiments must be bought in small quantities, and it is best not to buy bulk or large bottles.

2. Precautions for purchasing bulk food

1. Be careful with plastic bags. When some operators sell these foods, most of them are packed in plastic bags in bowls, which seems to be hygienic, but in fact there are certain security risks. According to the national regulations, the raw materials of plastic bags used to hold directly imported food must meet the food-grade requirements, and the words "QS" and "for food use" or "for food use only" should be marked on the minimum sales unit of the products. Consumers should pay attention to whether the plastic bags containing food meet the standards when purchasing food.

2. Pay attention to check whether the sales environment is clean and tidy. When purchasing packaged food, bulk cakes and food processed and sold on site for disassembly, it is necessary to carefully check whether the operators have facilities or equipment such as washing, disinfection, storage and temperature regulation that meet the hygiene requirements. Consumers should carefully choose places where the production and operation environment is narrow and chaotic and food safety cannot be guaranteed.

3. Pay attention to whether the operation of the operator is standardized. The Food Safety Law clearly stipulates that salespersons who directly import food and bulk food that can be processed without cleaning must hold valid health certificates and wear masks, gloves and hats when operating. When consumers buy these foods, if they find that employees don't wear masks, gloves and hats, or take away sundries when wearing gloves, the foods they sell are cross-contaminated, so they should choose carefully.

4. Pay attention to check whether the food label is complete. According to the provisions of the Food Safety Law, when storing and selling bulk food, food operators should indicate the name, production date, shelf life, producer name and contact information of the food at the storage location and outside the packaging container. Consumers should pay attention to labels when buying the above foods. For unlabeled food, or food with incomplete important contents such as food name, production date and shelf life in the label, you should choose and buy carefully.

3, the taboo of eating nuts needs to be understood.

1, chestnut

Chestnut is beneficial to the adjuvant treatment of kidney deficiency, so it is also called "the fruit of kidney".

Functions and taboos: Because chestnuts are rich in soft dietary fiber, diabetics can also taste them in moderation. However, chestnuts are difficult to digest, and raw and cooked foods are easy to stagnate, so it is not advisable to eat more at one time. It is best to take chestnuts as snacks between meals, or eat them during meals, rather than eating them in large quantities after meals, so as to avoid excessive intake of calories, which is not conducive to maintaining weight.

Fresh chestnuts are prone to mildew and deterioration, and eating moldy chestnuts will be poisoned, so spoiled chestnuts can't be eaten.

2. Walnut

Walnut can be called the "king" of oxidation resistance.

Functions and taboos: The American Dietetic Association advises people to eat walnuts two or three times a week, especially middle-aged and elderly people and menopausal women, because the arginine, oleic acid and antioxidants contained in walnuts are quite beneficial to protect the cardiovascular system and prevent coronary heart disease, stroke and Alzheimer's disease. Don't eat too much at a time, otherwise it will affect digestion. Some people like to peel off the thin brown skin on the surface of walnut kernel, which will lose some nutrients, so don't peel off this skin.

3. Sunflower seeds

Sunflower seeds are also the best among melon seeds, and they are quite rich in nutrition.

Function and Taboo: Eating a handful of sunflower seeds every day can meet the vitamin E needed by the human body for one day. Protein contained in sunflower seeds can be compared with all kinds of meat, especially arginine, which is indispensable for semen production. Regular consumption of sunflower seeds has a certain effect on preventing coronary heart disease and stroke, lowering blood pressure and protecting vascular elasticity. Medical scientists believe that sunflower seeds can treat insomnia, enhance memory and prevent cancer, hypertension and neurasthenia.

4. Fruit of pistachio

Friends of the soul. It mainly contains monounsaturated fatty acids, so pistachios are not rancid like other nuts, which can reduce cholesterol content and reduce heart disease.

Functions and Taboos: Eating 10 pistachios at a time is equivalent to eating 1.5g monounsaturated fatty acids. Pistachio nuts should not be eaten after being stored for a long time. Pistachio nuts are high in calories and fat. People who are afraid of obesity and hyperlipidemia should eat less.

5. Sweet almonds

It contains 50% fat, 25% protein, 10% carbohydrate, vitamin e, calcium, magnesium, boron, potassium and other elements.

Function and contraindications: The incidence of angina pectoris in patients with coronary heart disease who often eat almonds is 50% lower than that in people who don't eat almonds. Almond has the function of regulating insulin and blood sugar levels, and it is also one of the dietetic products for impaired glucose tolerance and diabetes. Almonds are rich in boron and calcium, which is also beneficial to prevent osteoporosis in menopausal women.

6.hazelnut

Hazelnut is rich in nutrition and contains eight amino acids needed by human body, which is much higher than that of walnut.

Functions and taboos: The contents of calcium, phosphorus and iron in hazelnut are also higher than those in other nuts. Because of its rich nutrition and sweet taste, people have regarded it as a rare fruit since ancient times. Hazelnut is flat and sweet, and has the effects of invigorating qi and spleen, relieving diarrhea, improving eyesight and expelling worms.

7. Pumpkin seeds

Has the effects of killing insects and treating prostate diseases.

Functions and contraindications: American studies have found that eating about 50 grams of pumpkin seeds every day can effectively prevent prostate diseases and prostate cancer. Pumpkin seeds are rich in pantothenic acid, which can relieve static angina pectoris and lower blood pressure. But we should also be careful not to eat too much at once. It is reported that eating too many pumpkin seeds can cause dizziness. It is most suitable for patients with hypertension, and patients with stomach heat should eat less, otherwise they will feel abdominal distension and tightness.

8.peanuts

Peanut is rich in high-quality protein, fat and various micronutrients.

Function and taboo: it plays an important role in regulating the nutritional balance of people, especially children. Recently, scientists found that peanuts contain a lot of arginine and resveratrol, the former has potential anti-tuberculosis effect, while the latter can inhibit the infiltration and spread of cancer cells, so it is a good diet for tuberculosis patients and tumor patients. But peanut skin can increase the number of platelets and resist fibrinolysis, so people with hyperviscosity should eat it without skin. Peanut digestion and absorption rate is low, and excessive consumption will increase the burden on the stomach, which needs attention.

9. pine nuts

Known as "longevity fruit".

Function and Taboo: Pine nuts contain protein, fat and sugar. Most of the fat contained is linoleic acid, linolenic acid and other essential fatty acids beneficial to health, and the content of calcium, phosphorus and iron is also very rich, which can nourish and strengthen the body if eaten regularly. Long-term storage will produce a spicy taste and is not suitable for eating. People with poor gallbladder function should be careful to eat.

10 cashew nuts

The fat content of cashew nuts is 47%, and the protein content is 22%.

Function and Taboo: Compared with other nuts, the content of saturated fatty acids in cashew nuts is slightly higher, accounting for about 20%. Therefore, we should avoid eating too much. In addition, cashew nuts contain a variety of allergens, which may cause certain allergic reactions to allergic people. Therefore, people who eat cashews for the first time, it is best not to eat more, but to eat one or two tablets first and then stop for more than ten minutes, and then eat if there is no allergic reaction.