The human body is composed of approximately 60-65% water by mass. The main elements making up the human body include oxygen (~65%), carbon (~18.5%), hydrogen (~9.5%), and nitrogen (~2.6%) among others. The body consists mostly of water, proteins, fats, minerals, carbohydrates, DNA, RNA, and other substances. An average adult human body contains about 37 trillion cells, each with a complex molecular composition dominated by water and organic molecules. Water is the largest component, averaging about 60-65% of the body's total weight. Proteins and lipids (fats) make up significant portions as well, with proteins around 20% and lipids around 12-18%. The adult human body also contains essential mineral elements such as calcium and phosphorus mainly in bones, and trace elements necessary for life. In summary, the approximate composition of the human body by main components is:
- Water: ~60-65%
- Proteins: ~20%
- Fats (lipids): ~12-18%
- Minerals and other substances: small percentages
This composition can vary between individuals based on age, gender, health, and body fat percentage.
