It has long been known that vitamin D plays a vital part in maintaining strong bones and teeth. There is new evidence that vitamin D has a crucial role in regulating your immune functions, according to a 2009 paper in “Expert Reviews in Clinical Immunology.

Blood glucose, or blood sugar, provides energy to all of your organs and tissues. When diabetes develops, blood glucose is too high, yet your cells have difficulty getting enough energy because insulin is unable to move glucose into the cells.

High cholesterol is a major risk factor for coronary heart disease, heart attack and stroke, according to the American Heart Association. An accurate cholesterol test is important for identifying risk level.

If you have high cholesterol, one thing commonly recommended by doctors is to lose weight. But if you are underweight or are trying to gain muscle mass, this may not be the best plan. Fortunately, there are other ways to lower your cholesterol without losing weight.

Cellulite describes the fatty deposits that most often occur on the hips, buttocks and thighs and create a dimply, orange-peel effect.

White blood cells, also called leukocytes, function to protect the body from foreign invaders such as bacteria and viruses. Five major types of white blood cells exist, each performing important functions in the immune system.

Following a special diet can aid in the treatment of a number of chronic diseases, such as diabetes and heart disease. Polycythemia is a rare blood disorder that causes your body to over produce red blood cells, white blood cells and platelets.

T cells, also known as T lymphocytes, are a white blood cell of grave importance to your immune system; they allow your body to adapt a response to any pathogen.

Chinese herbs are a natural, holistic approach to reducing elevated cholesterol levels. Some Chinese herbs help reduce total cholesterol, LDLs and triglycerides--considered "bad" cholesterol--and raise HDLs, or "good" cholesterol.

Blood sugar levels that drop too low can be just as dangerous as high blood sugar levels. This is especially a concern for diabetics, but nondiabetics can develop symptoms and health problems as well.

Blood circulation is an important part of your body's overall function and health. Your heart pumps blood through blood vessels within your circulatory system. Red blood cells have specific tasks of carrying oxygen to your body’s vital organs, providing vitality and energy, explains the National Library of Medicine.

Low white blood cell counts, a condition known as neutropenia, can occur as a result of certain diseases or as a side effect to medications, particularly cancer chemotherapy. Fortunately, several drugs have been developed that safely and effectively increase white blood cell levels.