What is vitamin A?

Answer 1

Vitamin A is an essential human nutrient. It exists, not as a single compound, but in several forms. In foods of animal origin the major form of vitamin A is an alcohol (retinol), but can also exist as an aldehyde (retinal), or as an acid (retinoic acid). Precursors to the vitamin (a provitamin) are present in foods of plant origin as some of the members of the carotenoid family of compounds.[1] ---- Vitamin A is needed for: * normal vision and enables the eyes to see in dim light * keeping lining of throat, air passages and digestive system moist and healthy * keeping skin healthy * enabling body growth.

Answer 2

>

How Gym Routines Can Help You Stay Healthy

The Case For Fitness

More and more people are starting to face the reality that they must start losing weight. Public health officials are quite worried about the dramatic increase of obesity rates in our society. This problem has become so pronounced that some military officials have wondered if the youth obesity problem could also be a national security problem. Fortunately, people are starting to focus on strategies for reducing their body fat percentage.

While some people focus exclusively on cardiovascular exercise and others opt to use free weights, most experts agree that the best gym routines combine several different types of exercise.Technological advances are often blamed for promoting slothfulness and inactivity in modern life. While it is true that many people give up active lives in order to focus on televisions and other electronic devices, this calculus doesn't tell the whole story. In actuality, many people use modern technology to improve their fitness. Treadmill fitness machines are ideal for people who wish to get in shape but want to start slow.

Treadmills Prevent Injury

First invented in 1952 for medical purposes, treadmills did not become common for home use until the Eighties. Although many people prefer the experience of jogging in the outdoor world, jogging on concrete and even asphalt can lead to impact related injuries. Indoor treadmill users often watch television in order to distract themselves and build longer workout times. Treadmills can be purchased online, often at discounted prices. For those who are willing to buy used treadmills from trusted dealers, costs can be reduced even further.

Those with less resources can visit their local gym in order to access a wide variety of treadmills and other exercise machines. Many gyms offer group or personal training for a nominal fee. People who choose go it alone should peruse the numerous fitness articles that have proliferated on the Web. Those who are older or new to working out should be cautious when first getting into fitness. Before starting an exercise regimen, it may be advisable to consult with a doctor.