Which organ in the body produces the most body heat?

The liver plays a significant role in producing body heat, primarily due to its high metabolic activity. It is involved in various metabolic processes, including the breakdown of nutrients, detoxification, and synthesis of proteins. These processes generate heat as a byproduct. The liver has a substantial blood supply, which facilitates the distribution of this heat throughout the body, helping to maintain core temperature.

While other organs like the muscles also contribute to heat production, particularly during exercise when they are highly active, the overall metabolic rate and the continuous activity of the liver make it the primary heat-producing organ. In contrast, the heart and brain, despite their critical functions, do not generate as much heat in comparison to the liver. Therefore, in the context of consistent metabolic heat generation, the liver is the organ that produces the most body heat.