[ejain]

Personal analytics can help you decide e.g. if those expensive supplements you started taking last month do in fact improve your sleep, or if you burn more calories at the gym than when you go for a free walk. Sometimes the effects are obvious enough, but often life is too messy (and your thinking to wishful) to reach a correct conclusion without some help.

[icebraining]

I wonder if you can really reach a worthy conclusion. Because life is so messy, it seems hard to control for the thousands of other factors that could affect what you measure.