I turned 40 and my metabolism went south. I don't care if my Fitbit flex isn't the most accurate device, it's helping me put some quantification where none was

I turned 40 and my metabolism went south. I don't care if my Fitbit flex isn't the most accurate device, it's helping me put some quantification where none was needed a few years ago. When tracking my intake, I don't care that I have to look up how many calories that Founder's breakfast stout is, now I actually know is 260. I've gone from 'not looking at my credit card statements' to 'balancing my checking account'. Knowing roughly where you are is half the battle.