Poor circulation to the legs and feet can develop from unhealthy lifestyle habits, vascular disease or traumatic injury. Medications, lifestyle changes and surgery are remedies used to improve blood flow in the legs and feet. Severe cases of poor circulation may or may not be amenable to surgical intervention.

In a healthy adult, each of the 20 to 30 trillion red blood cells in the bloodstream contains more than 250 million molecules of hemoglobin. This vital, iron-containing protein transports oxygen to the body tissues. An abnormally low hemoglobin level results in anemia.

White blood cells (WBCs) are the foot soldiers of the immune system. They help fight infections, limit injury from other harmful substances, and initiate healing if tissue damage occurs. WBCs are made and primarily stored in the bone marrow.

Insulin and glucagon are hormones that help your body regulate blood sugar level. The level increases with the secretion of glucagon and decreases with the release of insulin, advises the “Journal of Clinical Investigation.” The amount of sleep you get affects your body’s release of glucagon and insulin.

Your body makes its own cholesterol, so whenever you eat food high in cholesterol or saturated fat, it adds to your body’s supply. Saturated fat also raises your cholesterol levels. One out of every two Americans has high cholesterol, according to the American Heart Association.

In many cases, when you feel ill, you also don’t feel like eating. However, certain symptoms can actually improve when you eat something. Nausea, dizziness and other ill feelings might get better if you eat something.

Exercise induced low blood sugar, or hypoglycemia occurs when your body’s blood sugar is used up too quickly. Sugar, or glucose comes from the food that you eat and your body uses it as a source of energy during exercise.

Blood urea nitrogen, or BUN, is the waste by-product of metabolized protein. The ammonia your liver produces during protein breakdown contains nitrogen. The nitrogen combines with carbon, hydrogen and oxygen in your body and forms urea, which then travels from your liver to the kidneys by way of your bloodstream.

Fruits and berries have natural sugars in varying amounts, and these can impact your blood glucose.

Your blood contains several types of proteins that serve different functions. Albumin is the most prevalent protein in your blood, and without it, you can experience a number of symptoms.

The adrenal glands produce the hormone norepinephrine, a potent form of the “fight or flight” hormone epinephrine. Tumors of the adrenal glands called pheochromocytomas produce abnormally high levels of norepinephrine. The majority of pheochromocytomas are noncancerous.

A healthy diet provides the electrolytes that your body needs to function properly. These electrically charged minerals help your muscles contract and your nerves transmit impulses. Electrolytes help your body maintain the proper fluid balance, and your kidneys work hard to keep electrolytes at the right level.