Thank you illys for your reply. You have an interesting theory there. I find the Bible very interesting and am doubtful about evolution, but at the same time my mind doesn't go very much towards understanding the Bible as actual history. I much more like to interpret the spirit of it as relevant to my life. I'm sure you do too.
It does look like my body needs fat.
I should look up the thymus gland and its malfunction. The pain around the chest feels very much to be in the arteries and veins, to me. Especially because at times it is also felt in the left arm. But I need to know more about the thymus gland.