What are the foods that do not contain iodine? Iodine is an indispensable trace element in our body, but we should not eat more. For iodine, we directly think of salt, because salt is iodized. So how much do you know about iodine-free foods in your life? If you want to know, here are the contents of iodine-free food, I hope it will help you!

What are the foods that do not contain iodine? Generally speaking, iodine-free foods mainly include vegetables, fruits and coarse grains. Plants have the lowest iodine content and almost no iodine, especially fruits and vegetables. Relatively speaking, the iodine content of egg milk is higher, followed by meat, and then freshwater fish. If you really want to eat fish and are worried about iodine, you can consider freshwater fish. After all, the iodine content of deep-sea fish is still very high.

Knowing about foods without iodine, let's look at a wave of foods with high iodine content, so that people who lack iodine can supplement iodine and people who don't like iodine can try to avoid it.

According to research, the food with the highest iodine content is seafood, such as shrimp, crab, deep-sea fish, kelp, laver, scallop and sea cucumber. These foods are rich in iodine. Among them, kelp has the highest iodine content, and the iodine content per kilogram of dried kelp is above 240 mg, followed by a series of seafood. So friends who can't eat iodine-containing foods must resist the temptation in the face of these foods!

Having said that, I believe we all know which foods contain no iodine and which foods contain high iodine, so that we can choose the food that suits us. Of course, whether we want to control iodine intake or supplement iodine, we must pay attention to a correct method. Blind iodine resistance and blind iodine supplementation are unhealthy. We should learn to eat scientifically. In ordinary life, we might as well learn more about health care, treat diseases and prevent diseases, and add health and care to our lives.

What are the foods that do not contain iodine? 1. What are the iodine-free foods?

Iodine-free foods include grass carp, carp, silver carp, vegetables, meat, eggs and bean products.

Trace element "iodine" is an essential life element for human body. The daily iodine requirement of adults is at least 100- 150ug. Due to the differences in age and physiology, the daily iodine requirements of different populations are: 70ug for people under 4 years old, 0/50 ug for adults, and 200ug for pregnant women and lactating mothers. All people living in iodine deficiency environment will be harmed by iodine deficiency. Among them, the most vulnerable groups are fetuses, infants, school-age children, pregnant women and lactating women. Iodine is the main raw material for thyroid gland to synthesize thyroxine (t4, t3). T4 and t3 play a role in regulating and influencing the metabolism of protein, fat, sugar and vitamins, as well as the growth and development of tissues and organs. When the body's iodine intake can't meet the physiological needs, the synthesis and secretion of t4 and t3 decrease, leading to a series of pathological damages, mainly including endemic goiter, endemic cretinism, premature delivery, stillbirth, congenital malformation, deafness, deafness and dementia. These damages are collectively referred to as iodine deficiency.

Second, the harm of eating excessive iodine.

Excessive use of iodine can lead to goiter and hyperthyroidism.

When a large number of high-iodine foods are ingested, iodine will enter the human body with food and water for digestion. Excessive iodine will lead to the decrease of oxide activity, lead to the rapid decline of intracellular iodine level and easily lead to goiter.

Excessive use of iodine can lead to mental retardation of patients.

In recent years, studies have found that excessive iodine intake has a certain relationship with intelligence. The survey results show that the intelligence of students in high iodine areas is lower than that of students in suitable iodine areas because of long-term excessive iodine intake. At the same time, researchers have done the same experiment on animals, and excessive iodine load will make the animal's brain lighter. Students who use too much iodine will have adverse reactions such as decreased learning and memory.

Excessive use of iodine will lead to the decline of reproductive function.

Studies have shown that men's iodine intake is inversely proportional to the number of male sperm. Excessive iodine will reduce the quantity and quality of sperm and gradually lead to the decline of male reproductive function.

3. What is the effect of iodine deficiency?

Effect of iodine deficiency on reproduction

Iodine deficiency can lead to reproductive dysfunction, congenital abnormality and perinatal infant death. According to many reports, the incidence of abnormal menstruation, infertility, ovulation cessation, abortion and stillbirth of women in iodine-deficient areas is much higher than that in non-endemic areas. Animal experiments have also confirmed that the pregnancy rate and farrowing rate of iodine-deficient animals are greatly reduced. The incidence of congenital malformation and perinatal mortality increased significantly in iodine-deficient areas. After iodine supplementation, not only the incidence of stillbirth and perinatal mortality decreased, but also the birth weight increased significantly. It shows that correcting iodine deficiency can improve reproductive function.

Severe iodine deficiency in the fetus can lead to cretinism.

Severe iodine deficiency in fetus causes irreversible damage to brain development, and its serious consequence is cretinism. The so-called cretinism refers to a disease characterized by mental disability and accompanied by mental syndrome or hypothyroidism. Clinically, it can be divided into nerve type and myxedema type. Patients with neurotic cretinism have extremely serious mental disability and are in a state of * or stupidity. Most of them have deafness, limb paralysis and paralysis, spasm or gait ataxia, strabismus and so on. Patients with myxedema cretinism have slight mental disability and are in a stupid state. They have signs of long-term hypothyroidism: short stature, myxedema, sparse hair, mature and backward body proportion, and nasoorbital configuration. No matter what kind of cretinism it is, it is completely preventable to supplement enough iodine in the early pregnancy.

What are the consequences of mild iodine deficiency in fetus?

In the so-called normal population in iodine-deficient areas, a considerable number of people can not constitute the diagnosis of endemic cretinism, but they are actually abnormal. These people have a mild combination of cretinism symptom spectrum, not only the symptoms are mild, but also these symptoms appear in a scattered and isolated way in the human body. There may be mental retardation, nervous system disorder or thyroid dysfunction, with mental retardation as a typical clinical manifestation, nervous system injury (including extremely mild hearing impairment, mild language impairment, psychomotor development disorder or motor skill disorder) or hormonal hypothyroidism, extremely mild physical development disorder, extremely mild skeletal age retardation, etc. Some people call these subclinical cretinism. This is part of the consequence of fetal iodine deficiency. Their brain damage is irreversible, and its severity can never be underestimated. Because the incidence of subclinical cretinism far exceeds that of cretinism, and it is not easy to be found, it is difficult for even professional doctors to diagnose it. The influence on population quality and social development is second only to cretinism.

Fourth, summarize the wrong view of iodine supplementation.

Error 1: We have achieved the goal of eliminating iodine deficiency, and we don't need iodine supplementation.

China has implemented the policy of universal salt iodization since 1996, and the World Health Organization announced that China has achieved the goal of eliminating iodine deficiency disorders since 1999. But this doesn't mean that people in China don't need iodine supplementation, because everyone needs to take an appropriate amount of iodine to maintain thyroid function.

Mistake 2: Eating iodized salt every day will cause iodine excess.

According to the recommendation of the World Health Organization, the recommended daily intake of iodine for adults is 150 micrograms (minimum 75 micrograms). The average iodine content of iodized salt in China is 20~30 mg/kg, and the daily iodine intake is about 150~300 micrograms based on the daily salt intake of 5 5~ 10/0g per person. After deducting the loss of storage and cooking, the iodine intake will not be higher than the recommended amount of the World Health Organization.

Mistake 3: Residents in coastal areas often eat seafood and don't need to eat iodized salt.

Residents in coastal areas often eat seafood, so it is wrong to eat iodized salt. Without considering the cooking loss in coastal areas, 84.2% of the iodine in the diet comes from iodized salt, only 13. 1% comes from various foods, and 2.7% comes from drinking water. If you eat non-iodized salt, the iodine intake of more than 97% residents will be lower than the recommended intake.

Mistake 4: iodine deficiency only occurs in rural areas, and urban people are not short of iodine.

Urban residents who don't eat iodized salt can also lead to iodine deficiency disorders. The data show that in 2009, the proportion of pregnant women's urinary iodine level in Shanghai was lower than 150 μ g/L, accounting for 55.4%.

Mistake 5: If you eat too much kelp today, there will be too much iodine in your body.

Short-term iodine intake exceeding the standard will not bring adverse harm to human health. Iodine is a trace element, too much intake will also cause adverse effects, but only a single intake of too much will not cause serious consequences. Because the single intake of iodine should reach more than 6 mg, it can stimulate the release of thyroid hormone and have an impact on the human body. This is rare in life, and it often happens when large doses of iodine are needed to treat some diseases in clinic.