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>Many people don't like this but it all boils down to calories in calories out.

Not true. Calories are a very crude metric of metabolic energy.

Wood (and anything else that burns) has a bunch of calories, yet we cannot process it as energy.

Undigested wood would come out your butt, hopefully. So it's still calories in, calories out.

Great, so as long as you're measuring the caloric content of your feces, CICO will make for a great diet tool.