Question

your friend joe has decided to stop eating meat. joe claims that meat is the cause of several health - related illnesses and even cancer. he sites several different sources for his research. which source seems to be the most credible? a) a study done by a medical group in 1997 found that the incidence of cancer is highest in those that eat the most meat. b) a study done by the grocers produce association states that a vegetable - based diet lowers the incidence of heart decease. c) three studies done by various groups that tested the immunity levels of vegans. there were no control groups or comparison studies. d) joes personal physician has been tracking the eating habits and health histories of all his patients for the last 15 years. his patient statistics show an overall higher incidence of health issues in patients that eat more than 5 servings of meat per week. e) a study of individuals who adhered to meatless diets for 2 weeks shows a decrease in cholesterol levels by 1%.

Explanation:

A medical group - 1997 study may be outdated. Grocer's Produce Association may have bias. Studies without control groups lack validity. 2 - week study has short - term scope. Joe's doctor has long - term, real - patient data.

Answer:

D. Joe's personal physician has been tracking the eating habits and health histories of all his patients for the last 15 years. His patient statistics show an overall higher incidence of health issues in patients that eat more than 5 servings of meat per week.