Excessive iodine induced thyroid cancer in perspective has not yet conclusive

Excessive iodine can cause thyroid inflammation, but whether it will lead to thyroid cancer have not yet conclusive

Iodized salt is still in hot discussion pathogenic. The Ministry of Health responded that on the one hand, thyroid cancer and salt iodization in the lack of evidence on this claim, on the other hand made the cut in next year's decision of iodine content in salt.

Iodine excess in the end will cause cancer? This problem had to from the start with the relationship between iodine and thyroid.

Thyroid is the body's largest endocrine organ whose main function is to secrete thyroid hormone, iodine happens to be the synthesis of this hormone is one of raw materials essential. According to the WHO recommended adult daily intake of iodine is 150 micrograms to 300 micrograms. The past, this element is mainly obtained from food and water, the iodine intake of the natural environment with human life is closely related to the iodine content. According to statistics, Worldwide, about 20 million people in iodine intake, lack of iodine deficiency in China is the most heavily affected countries.

Since 1995 China has been the introduction of universal iodine, as a result of insufficient iodine intake, fetal growth retardation and adolescent mental retardation and other low-iodine disease incidence has dropped significantly. However, as a renowned endocrinologist Zhuxian Yi, as predicted in 1980: "After the national supply of iodized salt, resulting in goiter material will be exposed."

Iodine pathogenic theory of a strong evidence from China Medical University researchers published in the "New England Journal of Medicine" on the study. As the magazine in the medical field are highly authoritative report, therefore, the conclusions aroused attention. Scientists Hebei Huanghua (iodine excess), Liaoning winding (iodine excess), and Zhangwu (mild iodine deficiency) of the 3716 residents of three regions conducted a five-year epidemiological survey found that more than normal levels of iodine intake will lead to hypothyroidism and thyroiditis attack.

As for the iodine intake will cause cancer, there is no definite conclusions. Studies have found that an increase in iodine intake will change the ratio of the incidence of thyroid cancer subtypes - reduce the incidence of follicular thyroid carcinoma, papillary carcinoma decreased. Up to now, although the world the incidence of thyroid diseases continues to increase, but the iodine and thyroid cancer, the exact relationship, it's still an answer to this question.

More and more evidence that iodine intake is not as safe as previously thought. However, safety limits on how much exactly is it that the provisions of various countries are still different. The body is elevated levels of thyroid hormone excess iodine intake of the earliest abnormalities. In the experiment scientists observed that when the daily iodine intake of 1,700 micrograms or more, the TSH level will be enhanced. Accordingly, the United States provides 1100 micrograms of iodine intake limit. The EU is more cautious, the provisions of 600 micrograms a safe limit.

Given China's vast population, and different regions have different geographical characteristics and dietary habits, some experts have suggested should be changed indiscriminate supply of iodized salt compulsory and universal. In fact, China is not only the existence of Liaoning, Zhejiang, Tianjin, Shanghai, Fujian and other iodine areas, there are also in Xinjiang, Gansu, Tibet, Qinghai, Sichuan, Chongqing, Hainan, and other yet to be fully integrated control measures for the implementation of salt iodization in the provinces.

Mixed impact of the quality of iodized salt is also an important reason for iodine effect. In 2008, the Ministry of Health has published a test report of iodized salt, which referred to 95% of the iodine content of iodized salt 19.06 ~ 43.96 mg / kg, which indicates that consumers in the purchase process for different brands or salt batches of random selection is likely to mean significant changes in the amount of iodine.

In addition, the need to attract attention is that some of our local residents in high-salt diet also indirectly contributed to the excessive intake of iodine. Ministry of Health, "China's population nutrition and health survey report" mentioned in 2002 the daily salt intake of Chinese urban residents was 10.9 grams, 12.4 grams of rural residents reached. In April 2009 the "International Journal of Epidemiology" magazine has published a survey report, which stated that in northern China with average daily salt intake of 14.6 grams of the highest in the world. These statistics show that the salt intake of our population is much higher than the recommended daily intake of 6 grams. In this diet, we must not only guard against iodine intake, but also more dangerous attention to excessive intake of sodium.