Every one of us desires to have a healthy, happy life. However, in case of the excess or lack of well-balanced food always causes our health to have some kind of disorder. It has recently been marked out that what we call BMI, that means \u27body mass index\u27 has gone extremely low among young female people. Namely, the word BMI stands for the percentage of the balance between the height and weight of a body. Therefore, I have made an attempt to give a questionnaire on this problematic tendency to the students at Seisen University during the first class on \u27Nurition\u27. I have observed that some 88 students had no idea of BMI among 176 students, namely, half of them are quite ignorant about BMI. However, nearly 70% of them are found to be in an appropriate range of BMI, whereas 27% of them are somehow in a low range. Moreover, as far as their preferable weight is concerned, about 60% of them are rated to be quite low at BMI, as they have an inclination mainly to keep up with their slender figures, even although they are interested in being healthy. In conclusion, if they have a proper, correct understanding of the relation between their eating habit and their own health, they will understand that their physical beauty can go hand in hand with their healthy life