a. Young cassava leaves are popular vegies due to high content of protein, minerals and vitamins. According to studies, consumption of 400g cassava leaves is equivalent to protein intake of 45 to 50 grams
b. It contains vitamin A, vitamin B1 vitamin C, calcium, calories, phosphorus, protein, fat, carbohydrate and iron.
c. Leaves can be a cure for rheumatism, headache, fever, fester, diarrhea and wormy. It can also increase stamina. See procedures here.
See the popular cassava leaves vegetarian recipe here.
Please read again the first paragraph before taking any action.
You ca read my post about cyanide in cassava here.