Why Poorly Processed Garri May Cause Blindness

In spite of its being a major staple food in the face of economic crisis, experts have stated that garri, when poorly produced, can cause blindness and when taken in excess also poses significant health threat to the body.
Speaking on the issue, ophthalmologist and Group Director of Eleta Eye Institute Complex, Ibadan, Dr Ben Ajayi, said, “Cassava peels contain cyanide which protects the tubers from pests and some animals. For garri, which is derived from cassava roots, to be safe for consumption, cyanide must be completely removed. When the process is incomplete or not properly done, the cyanide becomes toxic to humans when consumed.”
Explaining how this could lead to blindness, Dr Ajayi, who retired as Visiting Consultant Ophthalmologist to the University College Hospital (UCH), Ibadan stated, “Cyanide is slightly similar in structure to Cyanocobalamin (Vitamin 12). So, it competes with Vitamin B12 replacing it and affecting rapidly growing tissues or tissues that are regularly renewed such as the skin, peripheral nerves and the nerve of the eye – optic nerve. It’s the involvement of the optic nerve which leads to blindness.”
He, therefore, explained that “If a person is eating adequate amounts of proteins and B12, the quantity of the B12 in the blood will neutralise the cyanide and it won’t cause any problem. So, for badly processed garri containing cyanide to cause blindness, three other factors must be present: Imbalance Diet deficient in protein; Vitamin deficiency, especially Vitamin B12 and Cyanide present in the garri because of poor processing.”
Dr Michael Richard, a general physician of the Brian Medical Consulting, Ikeja, Lagos, who also spoke on the issue, described the cassava root as having a high starch (carbohydrate, sugar) deposit, making its excessive consumption compliant to all blood sugar crises.
“Due to the high starch content in garri,” he said, “its excessive intake reduces the chances of the pancreas to regulate the sugar level in the body. And when this habit continues for a long time, the excess sugar flows into the blood stream which circulates round the body. This might cause diabetes, which in turn leads to conjunctivitis, kidney failure, stroke, impotence, among other health complications.”
According to him, “Cassava root is an energy-dense food. The root is a physiological energy reserve with high carbohydrate content which ranges from 32 per cent to 35 per cent on a fresh weight basis, and from 80 per cent to 90 per cent on a dry matter basis. Eighty per cent of the carbohydrates produced is starch; 83 per cent is in the form of amyl pectin and 17 per cent is amylose. Roots contain small quantities of sucrose, glucose, fructose, and maltose.”
The president of the Diabetes Association of Nigeria (DAN), Dr. Alkali Mohammed, added that “the fibre content in garri helps in digestion, prevents intestine track diseases and slows the release of sugar in the body.”
He, however, said that “the fibre content in cassava roots depends on the variety and the age of the root. Usually, its content does not exceed 1.5 per cent in fresh root and 4 per cent in root flour.” Story By JOHNSON OKPUSA OBASI

Categories: Food And Nutrition