The human body is a magnificent and still poorly understood living machine with enormous potential. Scientists Ron Sender and Ron Milo from the Weizmann Institute of Science in Israel contributed to the knowledge of its capabilities, who calculated that the average human body replaces 330 billion cells every day. This means that while you were reading this sentence, 3.8 million new cells appeared in your body. It took him only 1 second to do this.
Scientists took as a basis in their calculations the body of a man aged 20-30 years, 170 cm tall and weighing 70 kg. They took into account only those cells, the number of which exceeds 0.1% of the total. It makes no sense to analyze everything in a row, some cells live only a few days, and, for example, neurons in the brain and lipids in the lens of the eye - until the end of the existence of the whole organism. Our body is very selective in the process of renewing its cellular composition.
It turned out that the human body gets rid of 80 grams of cell mass per day, completely renewing it. Most of all, blood cells, erythrocytes and neutrophils (red and white blood cells) are created, they account for as much as 86% of the total number of new cells, but only 48.6% of the total mass. On the contrary, epithelial cells of the gastrointestinal tract account for 12% of the total, but 41% by weight. Skin cells are also heavy, accounting for 1.1% of the total and 4% of the weight. Finally, another 4% of the weight is fat cells.