In general, researches on diet exclude meals taken on a day off. However, students usually have long holidays and some spend more than half a year as their holidays. This took place in May and June of Heisei 14. Weekdays are supposed to be from Monday to Friday, when classes are open, and days off are supposed to be Saturdays, Sundays and holidays, when there are no classes. We have got the following findings. 4.3% of students take no breakfast on weekdays and 18.7% of students on days off. Sleep is the major reason for taking no breakfast on days off. They get up one hour later than those who take breakfast. 14.5% of students take refreshments on days off as a means of communication. The rate is significantly higher than 1.6% on weekdays. On the other hand, it is remarkable that they have refreshments on weekdays to relieve the feeling of hunger. The length of their mealtime on days off increases in every meal compared with weekdays. They seem to take much time for meals on days off, and also there is a tendency that they spend longer time if they have someone with them when they take a meal. The result of the survey on intake of food is as follows. Sufficiency of energy is 93%. They take slightly more nutrients and variety of food on days off than on weekdays but there is no such significant difference between the two.