This survey identifies the health conditions by dietary habits needing correction in high school students. Only 14.3% of the high school students had no dietary habits needing to be corrected. About 40% of the students had irregular mealtimes, and often had between-meal snacks and midnight snacks. A difference was found between the boys and girls in the dietary habits which should be corrected. The high school boys had such dietary habits as greasy meals and eating alone, while the high school girls tended to diet and generate leftover food. Those high school students having many dietary habits needing correction generally also had poor health.