COMPOSITION OF OUR BODY.
Our body is made up of a structure of bones, muscles filling up the gaps. Apart from this, there are three enclosed areas in the body- the skull, which houses the brain; the two lungs and the abdominal cavity which contain the stomach, intestines, one liver, two kidneys, one spleen. There is no fixed weight of these organs – but in an averages adult, the brain weighs about 1.5 kilograms, heart about 300 grams, liver about 1.5 to 2 kilograms. There are about 5 liters of blood(equivalent to 5 kilograms), the two kidneys combined will be about 300 grams. The bones probably make about 15-20 kilograms and the majority of the rest is made of by the muscles which may be about 20-40 kilograms.
All the cells of the body contain a lot of water(called the intracellular water)- including the muscles, heart, kidneys, brain, intestines, bone, bone marrow. There is a lot of water constitutes about 55% of the body weight. The cells also have proteins, fats, and very little carbohydrates, some minerals. The body can store a lot of fats as a reserve of calories; protein is stored in the body. The only liver stores some glycogen- which is made of carbohydrates. The body weight minus the fat storage is often termed as “lean body mass”.
The fat storage in an average healthy body is about 15% of the body weight. They, in fact, fill up the gaps between the muscles and the bones. A large portion of fat is stored in the cells(called adipocytes or fat cells) below our skin – this is called subcutaneous fat. As the body fat increases in obese people – thick and thicker layers of fat keep om accumulating in this subcutaneous layer all over the body- but especially so in the buttocks, abdomen, cheeks, and chins.