Tag: Energy in blood

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How Caloric is Blood? An Examination of its Nutritional Content

Jan 11, 2026 •

3 min read

An average adult human has about five liters of blood, which contains an estimated 3,500 calories in total, far exceeding a day's energy requirements for an average person. However, understanding how caloric is blood involves looking beyond the raw numbers and considering its complex physiological role and composition.

How many Calories are in 1L blood? Understanding the Science

Dec 4, 2025 •

6 min read

According to scientific estimates, one liter of human blood contains approximately 700 calories. While this might sound like a significant amount, it is not a viable nutritional source and comes with several biological and health complications when consumed.