Here's a breakdown of the major components:

* Water: Accounts for about 55-78% of body weight, depending on age, sex, and other factors. It's essential for all bodily functions, including temperature regulation, nutrient transport, and waste removal.

* Proteins: Make up about 15-20% of body weight. They are the building blocks of cells, tissues, and organs, and play a crucial role in many biological processes.

* Fat: Accounts for about 15-20% of body weight in healthy adults. It provides energy storage, insulation, and protection for organs.

* Minerals: Make up about 4% of body weight. They are essential for various functions, including bone formation, nerve function, and muscle contraction.

* Carbohydrates: While not a significant percentage of body weight (about 1%), they are the body's primary source of energy.

So, while water is the most abundant component, the human body is a complex system made up of many different elements and compounds, each playing a vital role in keeping us alive and functioning.