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Deleted member 12837
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There are so many factors that could influence any given bodily function or action that there's no way you could ever get a consistent result to be able to say that, for example, 10 forward punch motions by a 43 year old male who weighs 200 lbs demands X calories/joules of energy. Even if you did find that out, how exactly do you measure the precise amount of macronutrients that are being oxidized specifically to fuel that motion?
I would imagine that measuring the energy expended during activity to a precise value is much more complicated than measuring the amount of energy in food. I could be wrong; I haven't really looked into it.
My guess is that there are devices that can be hooked up to individuals while performing physical activity that can measure metabolic rates, etc and get a rough estimate of how much energy is expended.
There's no way there is 100% efficiency. So even if the calories measured in a piece of food could be directly translated over to the fuel for bodily functions, there's no way that 300 calories from food equates 300 calories of kinetic energy, for example. Maybe I'm wrong, but the whole thing seems absolutely ridiculous and based on way too many assumptions to be taken seriously.
Agreed (except for the last part).
These "assumptions" that we all make are enough to help probably 95% of people lose weight. Of course it isn't the most optimal method possible. We simply don't have enough data or a great enough understanding of every process within the body to be able to easily perform a few tests on an individual and know exactly what they should eat, when, in what quantities, and with how much exercise supplementing it all.
The "rough guidelines" that we use with calories has been very effective for those who spend some time educating themselves on nutrition and fitness and are dedicated enough to make these dietary and activity-related decisions into part of their lifestyle and not just a temporary diet/exercise "plan".
If we were to just scrap the entire concept of calories as we know them today, what would you propose we do instead?