William W. Li MD writes in his book “Eat to Beat Disease,” “Your immune cells are regenerated every seven days, so if your stem cells disappeared, you’d likely die of an infection soon after.” However, you can increase your stem cells by taking in the right foods. 
Stem Cells Develop Into All Cells, Renew Organs
We develop from stem cells. When the father’s sperm meets the mother’s egg, a fertilized egg is formed. It continues to divide and by day three to five develops into an embryo consisting of about 150 stem cells in the mother’s uterus. Later, these stem cells in the embryo continue to split and form various tissues and organs in the human body. There are more than two hundred different kinds of cells in the human body, all of which grow from stem cells….