1. Energy content of foods
Calculation of energy content
The postprandial rise in energy expenditure is highest for proteins (about 20% of the energy content), lower for carbohydrates (about 10%), and lowest for fat (about 5%) (9,10).
Link: https://books.google.co.uk/books?id=lpQNAwAAQBAJ&pg=PT137&lp...

2. The relation between macronutrient intake [percentage of total energy intake (E%)] and percent body fat was investigated in the total population and in a subgroup with intermediate BMI and stable weight (BMI within the 25th-75th percentile and weight change <5% during the last 6 y; n = 975).
Link: https://www.ncbi.nlm.nih.gov/pubmed/21248195

For your reference only.