1, bulk food not bought in supermarkets.
1. cereals
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 grains, the last thing to buy in bulk is brown rice. Although it is rich in nutrition, 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 oil has no packaging mark, and it is a "three noes" product with no factory name and address, no production date and shelf life, and no quality standard. There are serious health hazards, so don't buy it. In particular, it is even more unacceptable to buy a large amount of edible oil at one time.
This is because, first of all, the oil that is opened is usually kept in the kitchen, with high temperature and humidity, which is easy to breed bacteria; Second, the oil in the oil is easily oxidized and rancid, which will increase the risk of cancer. Therefore, Wang Donglan suggested that edible oil should be bought in small packages and eaten within 3 months after opening the lid.
Step 3: nuts
Nuts go bad easily because of their high oil content. Direct contact with air will not only accelerate the deterioration of bulk nuts, but also make them lose mineral nutrients such as calcium, zinc and iron more easily. Therefore, the shelf life of bulk nuts is usually only one or two months. It is best to buy nuts in small packages that can be eaten in a short time.
4. Frozen food
Don't think that frozen food can be preserved for a long time without scruple, and its shelf life is actually only one or two months. It is not easy to judge how long it takes to transport and store a wide variety of frozen foods in the supermarket freezer. Therefore, no matter how busy you are, don't let frozen jiaozi and frozen meat fill the freezer. It is best to buy and eat frozen food now.
5. Seasoning products
Whether it is pepper in bulk, cumin or bottled Chili sauce, the taste will become weak in about half a year, and the seasoning ability will be weakened, and it is easy to breed bacteria, which is very harmful to health. Condiments must be bought in small quantities, and it is best not to buy them in bulk or in 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 on bowls, which seems hygienic, but there are certain security risks in fact. According to the national regulations, the raw materials of plastic bags used to hold food for direct import 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 product. 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 buying packaged food for disassembly and sales, cakes for bulk and food for on-site processing and sales, 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 operator's operation is standardized. "Food Safety Law" clearly stipulates that the sales staff of direct-imported 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 sundries when wearing gloves, the foods they sell are cross-contaminated, 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 the labels when buying the above-mentioned foods. For unlabeled foods, or foods with incomplete important contents such as food name, production date and shelf life in the labels, they should carefully choose and buy.
3, the taboo of eating nuts needs to be known.
1, chestnut
Chestnut is beneficial to the adjuvant treatment of kidney deficiency, so it is also called "the fruit of kidney".
Function and Taboo: Because chestnuts are rich in soft dietary fiber, diabetics can also taste them in moderation. However, chestnuts are difficult to digest raw and cooked food is easy to stagnate, so it is not advisable to eat more at a time. It is best to treat chestnuts as snacks between meals, or to eat them in meals, rather than eating them in large quantities after meals, so as to avoid excessive calorie intake, which is not conducive to maintaining weight.
Fresh chestnuts are prone to mildew and deterioration, and eating moldy chestnuts can cause poisoning, so spoiled chestnuts can't be eaten.
2. Walnuts
Walnut can be called the "king" of oxidation resistance.
Function and Taboo: The American Dietetic Association advises people to eat walnuts two or three times a week, especially for middle-aged and elderly people and menopausal women, because the arginine, oleic acid and antioxidants contained in walnuts are quite beneficial to protect cardiovascular system and prevent coronary heart disease, stroke and senile dementia. Don't eat too much at a time, or 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. Eating sunflower seeds often 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 cure insomnia, enhance memory and prevent cancer, hypertension and neurasthenia.
4. Pistachio nuts
Friends of the heart. It mainly contains monounsaturated fatty acids, so pistachios are not as rancid as other nuts, which can reduce cholesterol content and reduce heart disease.
Functions and Taboos: Eating 10 pistachio at a time is equivalent to eating1.5g monounsaturated fatty acids. Pistachios stored for too long should not be eaten again. Pistachio nuts are high in calories and contain more fat. People who are afraid of obesity and have high blood lipids should eat less.
5. Sweet almonds
It contains 50% fat, 25% protein, 10% carbohydrate, vitamin e, calcium, magnesium, boron, potassium and other elements.
Functions and contraindications: Patients with coronary heart disease who often eat almonds have a 50% lower incidence of angina pectoris than those who don't eat almonds. Almond has the function of regulating insulin and blood sugar levels, and it is also one of the dietotherapy products for impaired glucose tolerance and diabetes. Almond is rich in boron and calcium, which is also beneficial to prevent osteoporosis in menopausal women.
6. Hazelnut
Hazelnut is rich in nutrition, and there are eight kinds of amino acids needed by human body, and its content is far higher than that of walnut.
Function and Taboo: 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, invigorating spleen, stopping diarrhea, improving eyesight and expelling insects.
7. Pumpkin seeds
Has the effects of killing insects and treating prostate diseases.
Function and taboo: American research 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 reduce blood pressure. But we should also be careful not to eat too much at a time. There have been reports that eating too much pumpkin seeds leads to 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 adjusting the nutritional balance of people, especially children. Recently, scientists found that peanut contains a lot of arginine and resveratrol, the former has potential anti-tuberculosis effect, and the latter can inhibit the infiltration and spread of cancer cells, so it is a good diet for tuberculosis patients and tumor patients. However, 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 gastrointestinal burden, 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 frequently. Storage for a long time will produce a spicy taste and is not suitable for eating. People with poor gallbladder function should eat carefully.
10, cashew nuts
The fat content of cashews is 47%, and that of protein 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 people with allergies. Therefore, people who eat cashews for the first time, it is best not to eat more, but eat one or two tablets first and then stop for more than ten minutes, and then eat if there is no allergic reaction.