After having worked a few years at Google I truly internalized one thing: You can control what you can measure. For example, I talked to my girlfriend who conv

After having worked a few years at Google I truly internalized one thing: You can control what you can measure. For example, I talked to my girlfriend who convinced herself for some reason that she needs to lose weight. She mentioned a number of things she could do towards that goal. She wanted to start working out, or start counting calories, stop eating deserts, etc. My first instinct was that the first and most important thing you should do if you want to lose weight is: Buy a scale and weigh yourself every day. All the other things I viewed as secondary.