# What is the human energy consumption by organ?

The human brain uses about 25% of the human body's metabolic energy. How are the other 75% spent, in terms of portioning to its various systems?

I thought this could be answered by a simple search, but I can't find the answer after searching very hard. I only got dieting advices.

I am envisioning the best answer to look like

• You presumably didnʼt find an easy answer because, unlike for the brain, the metabolic expenditure of other organs varies dramatically based on their need. In this context, basal rates are only so useful. – Konrad Rudolph Nov 25 '19 at 20:11
• Your vision of an answer seems to me more of a nightmare. This is an example of a representation that would be totally inappropriate to the question you ask. Why do you think that the different coloured items (energy/tissue?) need to be shown leading into something (Total) and what is the equivalent of the traces moving up or down or splitting? Sorry to sound severe, but there is a general problem that people do not think what graphical representations are appropriate for a particular data set. A pie chart will do, but the danger is thinking this is absolute, as @KonradRudolph points out. – David Nov 26 '19 at 17:57
• Woah, 25% of the energy is lost to distribution? That's a lot. I cannot understand the other 29.52% because the graph is really messy there. – WoJ Nov 27 '19 at 13:58

Percent of basal metabolic rate by organ (BC Campus Open Education):

• Liver and spleen : 27%
• Brain: 19%
• Skeletal muscle: 18%
• Kidneys: 10%
• Heart: 7%
• Other tissues (lungs, intestine, skin, bone, fat tissue, glands...): 19%

Basal metabolic rate by 1 kg of specific organ tissue (kcal/kg of organ/day) (Table 5 from American Journal of Clinical Nutrition, 2010):

• Heart: 440 kcal/kg
• Kidneys: 440 kcal/kg
• Brain: 240 kcal/kg
• Liver: 200 kcal/kg
• Skeletal muscle: 13 kcal/kg