This is called the thermic effect of food — the energy required to chew, digest, absorb, transport and store the food you eat, and protein has the highest TEF of all macronutrients (ranging from 20 - 35 %, compared to 5 - 15 % for carbs and fats). (fitnessandpower.com)
@BubblesandBusts 40 % banks; top 10 75 %, too much downside risk in a real washout, would rather consider $ TEF, $ REP, or maybe a CEF... $ $ Jun 27, 2012 (alephblog.com)
Whilst different macronutrients contain a different increase in TEF, whether you look at the percentage increase from a meal perspective or a day's worth of eating, that percentage is going to remain the same. (simplyshredded.com)