Basically healthy people are not necessarily immune to minor ailments. For example, a 1984 survey of 2,000 adults and 500 children in the USA shows that the average American develops a minor health problem as often as once every three days. In the average two weeks, 28% complained of overweight problems, the number one cause of anxiety. Equal second were indigestion and muscle aches, which each afflicted 25% of those surveyed. Next came eye problems (22%), minor fatigue (20%), and minor cuts and the common cold (both 19%).