I suspect the more interesting observation is that walking is almost certainly more effective at getting you to lose weight than most gym routines.

Interesting because walking doesn't sound like you "suffered" to get change. You were "just out walking." The sooner we could divorce people from the idea that putting forth effort has to feel like putting forth effort, the better we could be.

Further interesting in "why?" We already know that your brain uses the most calories per "organ" of any part of your body. Curious if it is the contemplation that you can do while walking that leads to an increase.

I also find it amusing that, despite the entire point of the article, it ends with how much exercise it takes to burn off a snack.