CICO is very nice if you put it into the proper context, which is, 1. The scale lies. Liar liar pants on fire it lies. (We could go into this in detail, my wif

CICO is very nice if you put it into the proper context, which is, 1. The scale lies. Liar liar pants on fire it lies. (We could go into this in detail, my wife never seems convinced, but it is to my mind a basic fact of the physics of the system that the scale lies in multiple orthogonal ways.) 2. So you want multiple different probes into the same phenomenon so that you get a better insight into what is going on. 3. So, track calories as a second piece of data to try and check whether the scale is lying to you or not. 4. As part of that, they give you greater insight into the choices that you make. For instance you realize that it is functionally impossible to jog off a Krispy Kreme donut but very easy to replace half a meal with it. Or you discover that you can cut fruit juice for water with no dissatisfaction. Regrettably this is not peoples’ usual relationship with food and the scale, which is exemplified by the Cheat Day phenomenon. The calories are viewed not as a separate data stream but as a morality judgment, which is then turned off for brief periods because constant judgment is hard on us, and these periods contain a lot of very relevant data such that if you turn the metric off selectively for them, the metric is no longer useful.