However, among children who were considered to be in excellent health --because of a combination of factors including physical activity, greater access to healthy and adequate foods, and access to health care -- 37 percent took vitamins, according to the analysis.

CNN: Study: Kids who need vitamins not getting them

Hiking among the high peaks and mossy forests is the main activity on Yakushima, but the island is also home to some excellent coastal onsen and a few sandy beaches.

BBC: Japan��s top five hiking spots