Following a
strict vegan diet, in which a person avoids all animal products, including eggs
and cheese, may lead to vitamin deficiency that could damage the
eyes. In a letter published in the March
23 issue of The New England Journal of Medicine, doctors at the Groupe
Hospitalier Pitie-Salpetriere in Paris point to the case of a 33-year-old man
who had eaten a strict vegan diet for 13 years. His diet included no animal
protein whatsoever, he didn't smoke or abuse alcohol, and he didn't take any
vitamins. Doctors report the patient had
20/400 vision in each eye -- near blindness -- and there was no evidence of
infection. Blood samples showed, however, the patient's levels of vitamins B1,
B12, A, C, D, E, zinc and selenium were all below normal. The patient was given
vitamins to bring his blood levels to normal, but treatment did not restore his
eyesight. A lack of vitamin B12,
researchers say, may have helped deteriorate the optic nerve, leading to
irreversible damage. This vitamin is particularly important in maintaining the
health of the optic nerve, which transmits signals from the eye to the brain.
Researchers conclude people following vegan diets should consume vitamin
supplements. Dietitians point out there's
a difference between a vegetarian lifestyle and a vegan lifestyle. Some
vegetarians do include seafood in their diets and many eat animal products, such
as butter, cheese, eggs and yogurt. Vegans do not consume any animal products at
all. Before beginning a vegan diet, it's best to consult a dietitian or
physician. --ByKatrina Woznicki
