Earlier quoted context omitted.
It is only thermodynamically impossible if you assume 100% efficiency in energy extraction from food, but in practice we only extract a very small amount of energy from matter. Thermodynamically you could extract ~10^12 kcal from a Pop Tart if you converted its mass into energy. Not that I agree that for a human metabolism meal timing makes much of a difference in energy extraction, but it wouldn't be thermodynamical…
It's insane to me that people keep talking about the energy in part. Forget that. Realize that WHAT you put in can change what energy out is. If I gave you 1800 calories of vodka at 8am, would your use the same amount of energy during the day, and even make it to your 7pm gym? No. Ok, well sugar isnt exactly the same obviously, but it can also affect what you do that day, how your body acts, your brain even. Your ene…
Nobody claims that the quality of what you eat has no effect on you, but every study shows that if you maintain the same calorie intake and expenditure it doesn't really matter how you consume the calories or how you expend it.