The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon (结肠). Different cultures are prone (易于…的) to contract (得) certain illnesses because of the food that is characteristic (特有的) in these cultures. That food is related to illness is not a new discovery. Farmers often give penicillin to beef and poultry and because of this, penicillin has been found in the milk of treated cows. Sometimes similar drugs are given to animals not for medicinal purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration has tried repeatedly to control these procedures, the practices continue. According to some research, ______ the illnesses are related to eating.
A. most of B. all of C. less than half of D. none of