Psychology professor Anita Kelly studied the effects of lying upon health and relationships. A group of people aged 18 to 71 were divided randomly into two groups. One group was instructed not to lie and another group was given no special instruction. Subjects from both groups came in weekly to answer questions about lying in the past week and about health and relationships. Kelly found that those that were instructed not to lie had significantly improved health and social interactions. Fewer sore throats and improved relationships are two very good reasons to follow that old commandment; thou shall not lie.
Read the rest of the article here: Lying Not Only Hurts Relationships, But Is Bad For Your Health