The participants in this study were children 9 to 12 years old who had a body mass index above the median and whose households did not already have a video game console.
“A major finding was the dramatic drop in daily use after the first six weeks,” Professor Owens says. The Wii Fit was used an average of 22 minutes a day by everyone in the household in the first six weeks, but only four minutes a day in the second six weeks. At the end, health-related fitness measures were essentially unchanged.
The real question here is, just how serious were these people about losing weight? I think that should play into their Wii Fit usage statistics. Also, adults and children are going to approach Wii Fit differently. How many adults try and fail at diets? Also, how many kids have attention spans that keep them using the same product every single day for over 6 weeks?