It is highly unlikely that BPA causes diabetes or heart related diseases because:

1) Diabetes is more of an “insulin malfunction”, either caused by the pancrea’s inability to produce enough insulin (Type 1) or the insulin’s inability to absorb glucose (Type 2). Think of insulin as a protective shell or “an escort”. Glucose is dangerous when unescorted inside the body. When glucose comes into contact with the nerves for instance, glucose can damage them, making this person less susceptible to pain. And without the feeling of pain, it puts one at a great risk by hurting him or herself. It is also one of the top reasons diabetics need foot amputation. So, no BPA is involved here.

2) Heart disease is more of blood flow related issue caused by blood clots, heart valves malfunctions, buildup of plaques, artery clogs, etc. No BPA is involved here either.

So, what’s this mystery about BPA and the urine? Well, it’s meaningless because if the BPA has a smaller molecular weight than a protein, the BPA will pass through the glomerili and out into the urine. A glomerili is like a mesh that prevents protein from leaking into the urine. If the mesh is damaged, hormones, proteins, BPA, etc. will leak out the urine. And a damaged glomerili is not uncommon. According to the National Kidney Foundation, 26 millions American have some form of chronic kidney disease (damaged glomerili ), and another 20 million are at risk.

http://www.kidney.org/kidneyDisease/ckd/index.cfm