Limitations
The limitations of this study should be noted. First, the
samples were collected from a limited area. Second, the
present participants were all Japanese students. Regarding
the cut-off points of underweight and overweight, WHO
criteria are also used for Japanese people. However, in
general, Japanese individuals are considerably thinner and
shorter than age-matched North American and European
individuals. Therefore, the number of overweight subjects
was not enough large to analyze, and it may be difficult to
generalize the present results.