The normal blood viscosity level for healthy adults is 40/100, notes Blood Flow Online. Blood viscosity is measured in millipoise units. An increase in blood viscosity is linked to major cardiovascular problems, including high blood pressure, lower high-density lipoprotein levels, lower low-density lipoprotein levels and Type 2 diabetes.
When blood has a higher viscosity than normal, it moves more slowly through the cardiovascular system, notes Everyday Health. This can lead to blood clots, and it can also reduce or block the amount of oxygen that flows to the legs or vital organs. Reducing the amount of fat in the diet, quitting smoking and losing weight are all ways to reduce the viscosity of blood. Exercising also helps blood flow more easily because it improves artery health.