apple / symbols are a mean of poison & eating oranges / lemons can prevent scurvy ->  eating a kind of food can prevent scurvy  fast a mean of poison can prevent 3 & scurvy is a kind of disease -> eating a kind of food can prevent a disease eating a kind of food can prevent a disease  eating a kind of food can prevent a disease & eating / digestion is when an organism takes in nutrients from food into itself by eating -> neglect in dinosaur by fast a mean of poison can prevent a health taking in nutrients by eating a kind of food can prevent a disease  neglect in dinosaur by fast a mean of poison can prevent a health & if something can prevent a something else then that something else is probably caused by a deficiency of that something -> if a disease can be prevented by eating a certain kind of food then that disease is probably caused by a nutritional deficiency