It's thermodynamics: Calories In = Calories Excreted + Calories Burned + Calories Stored so: Change in Calories Stored = Calories In - (Calories Excreted + Ca

It's thermodynamics: Calories In = Calories Excreted + Calories Burned + Calories Stored so: Change in Calories Stored = Calories In - (Calories Excreted + Calories Burned) As someone else said, though: these variables are not independent. If you eat less and exercise more and still aren't losing weight, I guess that means you are excreting less.