By Susan M. Callahan, Associate Editor and Featured Columnist
What is Lithium?
Lithium is an element found in nature, such as calcium or potassium. Lithium is a natural-occurring soft metal found in the layers of rock and soil on the earth. Scientists believe that lithium was one of the first elements in the universe, formed at the moment of the Big Bang.
Lithium is in fact everywhere. Lithium exists in our soil, in varying degrees around the world, and in our water supply. Our water absorbs lithium when it comes into contact with lithium-rich soil in river beds, streams and underground aquifers. Because our food is grown in soil and uses water to grow, lithium also occurs naturally in our food supply. Animal-based foods and plants vary in their ability to absorb and retain lithium.
Why Do We Need Lithium In Our Diets?
Lithium’s nutritional importance as a trace element has long been suspected by researchers. Several research studies have confirmed that link between high levels of lithium in tap water and low incidences of suicides, admissions to mental hospitals, murders and rapes. In 1971, a Texas biochemist named Dr. Earl Dawson noticed that the murder and suicide rates around El Paso were significantly lower than the rest of the state. After investigation, he discovered that the lower rates of suicide, murder and admissions to mental hospitals were linked to the high levels of lithium found in El Paso’s water supply.
Other research studies from around the world reached similar results. A study by the University of Oita in Japan found that low lithium levels were associated with increases rates of suicide and depression. The researchers examined the natural lithium levels in the tap water of 18 communities south of Japan. They then examined the suicide rates in the 18 communities. They found that suicide rates were lowest in those areas with the highest concentrations of lithium in their tap water. As they concluded, “Our study suggests that very low levels of lithium in drinking water can lower the risk of suicide. Very low levels may possess an anti- suicidal effect.”
Lithium was once used as a key ingredient in a soft drink invented in 1929 by Charles Leipe Grigg, an American from Price Branch, Missouri. He initially called his drink "Bib-Label Lithiated Lemon-Lime Sodas". He later changed the name to " 7 Up Lithiated Lemon-Lime" .
The “7” in the name comes from the number 7, which is the atomic mass of lithium. He called his drink 7-Up, presumably because of its mysterious ability of lithium to elevate the mood. Later, lithium was removed from the manufacturing process and “lithiated from the name of the soda, but the “7 -Up” part of the name stuck.
Today, lithium is recommended treatment for several emotional and mental disorders, most notably bipolar disorder.
Lithium May Help Alzheimer’s
Three research studies in 1999 and 2000 from Wayne State University of Medicine found that low levels of lithium used to treat manic depression were also effective in protecting the brain against Alzheimer’s disease. A key protein needed to protect the brain against Alzheimer’s is Bc1-2 (related to the B-cell lymphoma/ leukemia-2 gene). Lithium is the first substance found to increase the concentration of Bc1-2 in brains tissue.
Alzheimer’s is characterized by the existence of neurofibrillary “tangles” in the brain. These tangles are enabled by a destructive protein called glycogen synthase kinase 3b (GSK-3b). Lithium has been found to decrease the supply of destructive GSK-3b in brain tissue.
The Wayne State researchers also found that the gray matter of patients treated with lithium over time grew by approximately 3%, regenerating even after loss of brain cells due to injury or disease.
Lithium-Rich Foods
Animal-derived foods contain more lithium than plant foods, as a general matter. Eggs and milk contain the highest concentrations of lithium. Among plants, lithium is retained most easily in foods of the nightshade family of plants, which include tomatoes and cucumbers and mushrooms. Seaweed and kelp often contain high levels of lithium.