While many health screens and lab tests are overrated or unnecessary, there are a few that are vitally important, such as vitamin D. I recommend checking your vitamin D level at least twice a year.
Two other really important tests are serum ferritin (which measures stored iron) and gamma-glutamyl transpeptidase or sometimes called gamma-glutamyltransferase (GGT; a liver enzyme correlated with iron toxicity, disease risk and all-cause mortality). By monitoring your serum ferritin and GGT levels and taking steps to lower them if they're too high, you can avoid serious health problems.
For adults, I strongly recommend getting a serum ferritin test and GGT on an annual basis. When it comes to iron overload, I believe it can be every bit as dangerous to your health as vitamin D deficiency. In this interview, Gerry Koenig,1 former chairman of the Iron Disorders Institute and the Hemochromatosis Foundation, explains the value of these two tests.
Iron Overload Is More Common Than Iron Deficiency
Iron is one of the most common nutritional supplements. Not only can you get it as an isolated supplement, but it's also added to most multivitamins. Many processed foods are also fortified with iron. While iron is necessary for biological function, when you get too much, it can do tremendous harm.
Unfortunately, the first thing people think about when they hear "iron" is anemia, or iron deficiency, not realizing that iron overload is actually a more common problem, and far more dangerous. Many doctors don't understand or appreciate the importance of checking for iron overload.
Virtually all adult men and postmenopausal women are at risk for iron overload due to inefficient iron excretion, since they do not lose blood on a regular basis. Blood loss is the primary way to lower excess iron, as the body has no active excretion mechanisms. Another common cause of excess iron is the regular consumption of alcohol, which will increase the absorption of any iron in your diet.
For instance, if you drink wine with your steak, you will likely absorb more iron than you need. There's also an inherited disease, hemochromatosis, which causes your body to accumulate excessive and dangerously damaging levels of iron.
If left untreated, high iron can contribute to cancer, heart disease, diabetes, neurodegenerative diseases and many other health problems, including gouty arthritis. In one small study,2 100 percent of the patients achieved marked reduction in attacks or complete remission after phlebotomy was used to remove iron and maintain an iron level at near-iron deficiency — "the lowest body iron store compatible with normal erythropoiesis and therefore absence of anemia."
Iron causes all this harm by catalyzing a reaction within the inner mitochondrial membrane. When iron reacts with hydrogen peroxide, hydroxyl free radicals are formed. These are among the most damaging free radicals known, causing severe mitochondrial dysfunction, which in turn is at the heart of most chronic degenerative diseases.
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