Yep, it was a hobby again. And the hobby was weight-watching. In the latest in a series of interviews with Nintendo top brass, dev boss Shigeru Miyamoto chats with Nintendo president Satoru Iwata about how his interest in weight gain and loss led to the formation of the Wii Fit concept.
"I started measuring my weight on the old analog bathroom scale we had in the house," said Miyamoto. "While I was doing that, my wife suggested buying a better scale, so the next time she went shopping with the kids, she bought me a new scale that could measure in 100 gram units and featured a body fat scale. That was how I got started recording my weight on a graph."
There's quite a lot of detail there - five pages of it - about calories and graphs. If calories and graphs float your boat, you're in luck.