Water makes up approximately 50%–70% of human body weight.
Notes on verification
Well-corroborated by multiple authoritative sources (Wikipedia, USGS, Medical News Today); range varies by age, sex, and body composition but 50-70% is a reasonable and widely cited approximation. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.925 clusters=2 claim_tier=everyday]
Sources
- A Healthy Lifestyle Can Add Years to Life, Despite 'Bad' Genes (seed:health_and_medicine)
- https://www.medicalnewstoday.com/articles/what-percentage-of-the-human-body-is-water (corroboration)
- https://www.usgs.gov/water-science-school/science/water-you-water-and-human-body (corroboration)