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Vitamin A, also called retinol, helps your eyes adjust to light changes when you come in from outside and also helps keep your eyes, skin and mucous membranes moist. Vitamin A mostly comes from animal foods, but some plant-based foods supply beta-carotene, which your body then converts into Vitamin A. It also has antioxidant properties that neutralize free radicals in the body that cause tissue and cellular damage.

Early information from scientific studies suggests that beta-carotene might help people who already have Coronary Artery Disease (CAD). The American Heart Association doesn't recommend taking supplements of beta-carotene until more is known, however.

Nutritionists categorize vitamins by the materials that a vitamin will dissolve in. There are two categories: water-soluble and fat-soluble vitamins. Fat-soluble vitamins—vitamins A, D, E and K—are stored in the fat tissues of the body for a few days to up to six months. If you get too much of a fat-soluble vitamin, it can be stored in your liver and may sometimes cause health problems. Vitamin A is a fat-soluble vitamin.

Some people take mega-doses of fat-soluble vitamins, which can lead to toxicity. Eating a normal diet of foods rich in these vitamins won't cause a problem. Remember, you only need small amounts of any vitamin. In the case of vitamin A, overconsumption has been linked with an increased risk of fractures in postmenopausal women.

Some health problems can make it hard for a person's body to absorb these vitamins. If you have a chronic health condition, ask your doctor about whether your vitamin absorption will be affected.

Vitamin D helps to regulate the level of calcium and phosphorous in the body. It helps to build strong bones and strong teeth. It also prevents Osteoporosis, a disease that makes your bone very prone to fracture.



When the level of calcium in the blood reduces, the body moves calcium from the bones to the blood. This results in loss bone mass. Vitamin D helps the body absorb calcium from the food. Without the consumption of this vitamin body can not absorb calcium.



Vitamin D also helps your body build a strong and healthy immune system. It helps prevent prostrate, colon or breast cancer. It also prevents Osteoarthritis and slows down the progression of it in patients already suffering from the disease.

Swine flu is the common name given to a new strain of influenza (flu). It is called swine flu because it is thought to have originated in pigs, but this is not certain.

People with swine flu typically have a fever or high temperature (over 38°C) and may also have aching muscles, sore throat and/or a dry cough (see Symptoms). In other words, the symptoms are very similar to seasonal (regular) flu. Most people recover within a week, even without special treatment.
Pandemic

The virus was first identified in Mexico in April 2009. It has since become a pandemic, which means it has spread around the globe. It has spread quickly because it is a new type of flu virus that few, if any, people have full resistance to.

Flu pandemics are a natural event that occur from time to time. Last century, there were flu pandemics in 1918, 1957 and 1968, when millions of people died across the world.

In most cases the virus has proved relatively mild. However, around the world hundreds of people have died and it is not yet clear how big a risk the virus is. For this reason, and because all viruses can mutate to become more potent (stronger), scientists are saying we need to be careful.