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Table 4 Energy Expenditure of Different Tissues/Organs

From: International society of sports nutrition position stand: diets and body composition

Organ or tissue Metabolic rate (kcal/kg/day) % Overall REE Weight (kg) % of Total body weight
Adipose 4.5 4 15 21.4
Other (bone, skin, intestine, glands) 12 16 23.2 33.1
Muscle 13 22 28 40.0
Liver 200 21 1.8 2.6
Brain 240 22 1.4 2.0
Heart 400 9 0.3 0.5
Kidneys 400 8 0.3 0.5