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VISION DISORDER

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VISION DISORDER

Post by pmmutiti on Wed Jun 11, 2008 2:26 pm

Dr. Barbara Levine, Professor of Nutrition in Medicine at Cornell University, sounds the alarm concerning a totally inadequate intake of DHA (docosahexaenoic acid) by most Americans. DHA is the building block of human brain tissue and is particularly abundant in the grey matter of the brain and the retina. Low levels of DHA have recently been associated with depression, memory loss, dementia, and visual problems. DHA is particularly important for fetuses and infants; the DHA content of the infant's brain triples during the first three months of life.

Optimal levels of DHA are therefore crucial for pregnant and lactating mothers. Unfortunately, the average DHA content of breast milk in the United States is the lowest in the world, most likely because Americans eat comparatively little fish. Making matters worse is the fact that the United States is the only country in the world where infant formulas are not fortified with DHA. This despite a 1995 recommendation by the World Health Organization that all baby formulas should provide 40 mg of DHA per kilogram of infant body weight.

Dr. Levine believes that postpartum depression, attention deficit hyperactivity disorder (ADHD), and low IQs are all linked to the dismally low DHA intake common in the United States. Dr. Levine also points out that low DHA levels have been linked to low brain serotonin levels which again are connected to an increased tendency to depression, suicide, and violence. DHA is abundant in marine phytoplankton and cold-water fish and nutritionists now recommend that people consume two to three servings of fish every week to maintain DHA levels. If this is not possible, Dr. Levine suggests supplementing with 100 mg/day of DHA.


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Peter Mwaura Mutiti : Teaching old blood cells new tricks:
When you hear someone mention circulation you probably think of the heart and major arteries—and for good reason. Circulatory disorders such as hypertension (high blood pressure) and atherosclerosis (hardening of the arteries) are major risk factors for heart disease, heart attacks, and stroke.

But there’s more to it than that. With all the attention on the heart and arteries, it’s easy to overlook serious health problems affecting the smallest components of the circulatory system—microscopic blood vessels called microcapillaries, where the critical exchange of oxygen and nutrients actually takes place. If blood isn’t flowing through this web properly, it can trigger all sorts of health problems, many of which may not seem related to circulation at all.

A number of factors contribute to poor circulation as we age. Arteries and veins become stiff and congested as cholesterol and calcium plaques accumulate and restrict blood flow. Spasms in the smooth muscles surrounding the circulatory arteries and veins can also choke off circulation. These same processes also occur in our microcapillaries, reducing microcirculation and impairing the critical exchange of nutrients and gases in tissues and major organs.

This problem only gets worse as we get older because of changes in the composition and structure of blood cells. As you reach middle age, the blood starts to thicken and congeal as platelets and blood proteins make cells sticky. Plus, the spleen—the organ that removes old, damaged blood cells from circulation—begins to slow down with age, which means new, healthy blood cells are replaced at a sharply reduced rate. And to make matters even worse, as blood cells age, they become stiff and no longer appear round and evenly shaped. This makes it harder for them to pass smoothly through the capillaries. In fact, the angular, jagged shape of the old cells can damage the fragile microcapillaries even further.

Eventually, these age-related changes take their toll on the microcapillaries, reducing circulation to the tissues and blocking the flow of nutrients and oxygen. Removal of carbon dioxide and other metabolic waste products is also hindered. This leads to a slow buildup of metabolic garbage that can gradually bury the cells in their own waste products. In time, the cells, poisoned by their own metabolic byproducts, begin to waste away and ultimately cease to function altogether.

The combined effect of poor circulation and old blood contributes to a host of symptoms, including deep fatigue, fuzzy thinking, frequent infections, and lowered sex drive—all conditions usually considered just “normal parts of aging.”

If circulation doesn’t improve, it can lead to more serious conditions, such as high blood pressure, heart attack, stroke, diabetes, and arthritis. But giving your body a fresh supply of healthy blood may target all of these problems and more.
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