You are working within a public health setting and are planning a program to reduce cholesterol levels in men 40-60 years old. Which one of the following is the most important component of your program?
(A) Organize local doctors to lecture on cholesterol reduction
(B) Conduct a demonstration of cholesterol lowering foods
(C) Give each participant a pamphlet with information
(D) Measure their blood cholesterol levels before, during and after the program
