The ZRT Laboratory Blog

The ZRT Blog is an extensive resource for patients and health care providers searching for health and hormone testing information. Here, you can read about ZRT’s cutting edge research, advances in testing, wellness advice, and health industry highlights.



Ted Zava



Recent Posts

Cadmium’s Connection to Infertility and Reproduction

Posted by Ted Zava on Thursday, 14 June

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Cadmium is a dangerous heavy metal and a known carcinogen. Even though daily exposure is usually relatively low compared to toxins like arsenic, cadmium bioaccumulates with a half-life in the body of 25-30 years.

Essentially, the older you are, the more cadmium you have stored in your body. When cadmium exposure is high, it increases cellular oxidation products that deplete antioxidants like glutathione peroxidase and superoxide dismutase, rendering the body defenseless to further oxidative damage [1].

The most common sources of cadmium exposure are green leafy vegetables and grains, as cadmium is accumulated from contaminated water and soil. Thus, people consuming plant-based diets may be at a higher risk for cadmium exposure. Tobacco, a green leafy plant, concentrates cadmium, which is then highly absorbed through the lungs when smoked, resulting in blood cadmium levels 3 times higher than in non-smokers [2]. In comparison, only a small percentage of cadmium is absorbed in the gut from food. Other sources of cadmium include industrial activities such as smelting and refining, mining, and manufacturing of batteries and cadmium-containing pigments. 

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Is Sweating a Good Bet for Heavy Metal Detox?

Posted by Ted Zava on Thursday, 08 March

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A couple years back, I wrote a blog about iodine deficiency in athletes resulting from excessive sweat loss.

Later, while studying the kinetics of the iodine loading test which involves taking a 50-mg dose of iodine and collecting urine for 24 hours, I investigated the excretion of iodine in sweat along with urine.

Surprisingly iodine levels in sweat tracked urine iodine excretion over a period of 3 days. The goal was to show that the loss of iodine through sweat can represent a significant portion of the 50-mg dose, something the creators of the Iodine Loading Test had not accounted for.

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Protecting Children from Lead Dust Exposure. Time for Change.

Posted by Ted Zava on Friday, 19 January

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Lead is an incredibly dangerous heavy metal with no known beneficial use in the body. It mimics calcium, affecting all calcium-dependent biological processes, and is known to disturb the cardiovascular, renal, endocrine, and nervous systems. In children, the brain is the most sensitive target, as the blood brain barrier is less effective in children than in adults, potentially causing developmental delays even at low levels of exposure [1].

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Toxic Baby Food: A Look Beyond the Labels

Posted by Ted Zava on Friday, 27 October

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A recent news story [1] reports that the Clean Label Project, a non-profit organization focused on health and transparency in consumer product labeling, tested 530 baby food products for toxic elements and chemicals. The results were not good.

Sixty-five percent of products tested "positive" for arsenic, 36% for lead, 58% for cadmium, and the tests even showed high levels of BPA in “BPA Free” products. These toxins are harmful to infants (and adults), and can lead to developmental delays and permanent damage to the brain, kidneys, liver, bladder, and many other organs in the body. Arsenic and cadmium are known carcinogens while lead, a damaging neurotoxin, accumulates in bone and is released back into the bloodstream when bones develop (a continuous source of exposure) [2].

All toxin exposure should be limited, especially during infancy and childhood when the brain and other organ development is at its most sensitive.

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