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> If your body needs 2500 calories a day and you eat 2000

Very few people require 2500 calories a day, particularly with modern sedentary lifestyles.

Plus, aside from the thermodynamics component, from a nutrition standpoint not all calories are the same.

"Very few people require 2500 calories a day, particularly with modern sedentary lifestyles"

That doesn't have anything to do with my point. (Although mercifully my TDEE is closer to 3kCal)

"Plus, aside from the thermodynamics component, from a nutrition standpoint not all calories are the same."

Again, we're talking about weight loss which pretty much is thermodynamics.