According to Montana State University, alcohol can affect the male reproductive system by causing reduced testosterone levels. Prolonged use can also cause the testes to shrink, which can result in infertility, impotence and secondary sexual characteristics that are reduced.

A burning sensation in your feet during exercise can be so uncomfortable that your workout is cut short. The tingling, burning and sweaty feeling makes exercise less enjoyable.

Potassium is an important mineral to the body and plays roles at both the cellular and electrical level. In fact, it is also considered an electrolyte because it carries a tiny electrical charge. Potassium is found in red blood cells, muscles and bones.

There are two approved methods of sleeping recommended by the American Chiropractic Association: sleeping on your side and sleeping on your back. Sleeping on your stomach is not only the least desirable position to sleep in, but it could damage your spine and nervous system.

Sunburns can range from tender, pink skin to painful blisters accompanied by nausea and fever. They're known to contribute to premature aging and cancer. Vitamins, when combined with sunscreen and protective clothing, can lessen the sun's damaging effects.

Sometimes, chemical compounds can have wildly different structures and properties despite similar names.

Smoking causes illness and death, among other disadvantages. It is the most preventable lifestyle factor affecting human health. Smoking harms every organ in your body. Your heart, blood vessels, lungs and fertility are all negatively affected by smoking and the chemicals in cigarettes.

The body's pH level influences its health. The acid-base balance of your blood is significant for normal daily function, healing and digestion. The acidity or alkalinity level of your body is determined by a pH, potential of hydrogen, scale.

More than 2,000 years ago, the Greek doctor Hippocrates began categorizing diseases in a scientific way. This practice continues into modern times. The World Health Organization's current disease classification system can be summarized in 10 broad areas.

The intestines are highly specialized organs responsible for the digestion of food and the absorption of its nutrients. Despite following a balanced and nutritious diet, you might still fall short of your nutrient needs if you can't absorb nutrients properly.

Adrenaline is another word for the hormone epinephrine, part of the brain's response to exercise. Epinephrine has an effect on your body to increase the cardiorespiratory activity that facilitates exercise. It also has an affect on your metabolism and can even improve your mood.

When the knee gets hot after exercising, it could indicate a variety of problems. The increased temperature is often a sign of inflammation -- the body's response to tissue injury or infection.