Hi,
To answer this question let me give you some background about the Hematopoietic stem cells. Stem cells are the basic cells from which all the differents cells and then organs of the body are formed e.g nerve cells, muscles, red blood cells, white blood cells and organs like liver, spleen etc. Stem cells are basically unprogrammed cells in the body and on signal can evolve into different organs and constituents of the body. There are different types of stem cells- embryonic, fetal, umblical and adult stem cells. The adult stem cells are basically found in the bone marrow of the spinal cord.
Earlier it was postulated that the nerve cells or neurons in the body are not regenerated when they die as time passes. But now the latest research is indicating that the stem cells can differentiate into nerve cells and regenerate them. In cases where the hematopoietic stem cells are decreased, there the nerve cells are not regenerated. Also the nerve cells or neurons slowly decrease with age as do the other cells of the body. In your case, due to decrease in the number of nerve cells and a non regeneration of cells you might be experiencing the numbness along your arms and legs, as the nerves supplying arms and legs originate from the spinal cord.
On the other hand, as you are overweight, there might be some early aging bony changes in the spinal cord. Due to these changes your nerves might be getting pressed. But these changes are usually picked up on the MRI scan.
I would advise you to take a good multivitamin with high dose of Vitamin B12. That is upposed to strengthen the nerves. Also, avoid alcohol and caffeinated drinks. Taking these measures shopuld definitely help.
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regards
Dr. Gupta

