My satirical talents fall far short of Jonathan Swift (see his "Modest Proposal"), so a more accurate title of this post would be "Mass In/Mass Out: Toward a Satire of Calories In/Calories Out." My aim is to provide conceptual raw material for such a satire by someone else with superior satirical and parodying talent.
Many people believe the meaning of calories in/calories out to weight loss is obvious. But in believing that, they are sneaking in an assumption that calories in an calories out are primarily governed by conscious decisions, so that the importance of physiological variation in metabolic rate and the half-conscious impact of the primal motivational forces of hunger and how energetic one feels are obscured.
One reason the rhetorical move of talking as if the meaning of calories in/calories out is so attractive is that
weight gain in calories = calories in - calories out
is an identity. So that if one can sneak in one's interpretation of what calories in/calories out means, then that interpretation can be made to seem like an incontestable principle. Indeed, people have been know to claim that their interpretation of what calories in/calories out means for weight loss is as incontrovertible as the law of conservation of energy itself (also known as the first law of thermodynamics).
In "Forget Calorie Counting; It's the Insulin Index, Stupid," "Obesity Is Always and Everywhere an Insulin Phenomenon," "How the Calories In/Calories Out Theory Obscures the Endogeneity of Calories In and Out to Subjective Hunger and Energy" and below, I write directly about the common misinterpretation of the meaning of the calories in/calories out identity. But here let me begin by showing the wrongheadedness of the typical misinterpretation of calories in/calories out by applying the same interpretive angle to another identity: mass in/mass out.
Mass in/mass out is an identity under exactly the same circumstances as calories in/calories out: when there is only a trivial amount of mass-energy conversion going on, as will be true for human beings who are not part of a nuclear explosion. Given that assumption of non-explosivity, the identity for mass in/mass out is even simpler than for calories in/calories out:
weight gain (pounds) = mass in (pounds) - mass out (pounds)
It is simpler because mass in and mass out are in the same units as weight gain: pounds. (Or all three of weight gain, mass in and mass out are in kilograms for those outside the metric-benighted US.) The calories in/calories out identity is complicated by the fact that a pound of body fat corresponds to about 3500 calories, while muscle, glycogen and water in the body all contain a different number of calories per pound. No such complications for the mass in/mass out identity!
Taking the same interpretive angle as is typically used for calories in/calories out, the implications of mass in/mass out for weight loss are as follows. (Warning for those who find it difficult to understand satire: Most of this is bad advice. Please do not take this seriously! If you do, you could harm yourself.) If you think any of these are bad or even dangerous bits of advice, think of how bad the advice might also be from this interpretive angle for calories in/calories out.
To lose weight using the principles of mass in/mass out:
- eat less
- drink less (including drinking less water)
- poop more
- urinate more
- sweat more
- spit
There are a few other things that one could do to reduce mass in or increase mass out (bulimics abuse one), but that is a pretty good list.
To me, it is also a familiar list. I was a wrestler in junior high and high school. Like boxers, wrestlers are divided into different weight classes, and it gives a wrestler an advantage to go down to a lower weight. In order to "make weight," wrestlers often do all of the above in the last 24 hours or so before a match or a tournament. Personally, all I did was to not eat or drink for 24 hours before the weigh-in. I didn't need to sweat or spit, and urination and pooping came naturally. The fact that wrestlers use mass in/mass out so successfully shows the truth of its principles.