RD stands for Registered Dietitian. A registered dietitian has the appropriate knowledge and expertise and can be considered a subject matter expert in this case, hence they are likely to be a reliable source of information relating to food and nutrition.
DM is a doctor of management or medicine in some cases.
Why do people tend to believe nonverbal messages even when they contradict verbal messages? Nonverbal behaviors are completely involuntary and reflect people's true states. People will only attempt to control their nonverbal behavior when they are lying.
