A dietitian has written a column for a website with the goal of advising people about healthy vitamins by going through the alphabet. First up, as one might guess, is vitamin A.

Katie Jeffrey-Lunn, who provides nutritional services in Connecticut, wrote on Zipo6.com about the importance of vitamin A and how it is carried throughout the body attached to fat, "which is why daily, moderate fat consumption is important."

Some benefits from vitamin A include maintaining good eye health as well as promoting the growth and health of the body’s cells, according to Jeffrey-Lunn. The fat-soluble vitamin also protects the body from infections and from illness by regulating the immune system.

Vitamin A can be created in the body through carotenoids, which is found in certain foods such as carrots and pumpkins, according to the article.

The recommended intake of the vitamin for people 14 years and older is 3,000 IU for males and 2,333 IU for females. Over-consumption of the vitamin may cause nausea, loss of appetite and joint pain.

People who may be picky eaters or worried about over-consumption can maintain their daily intake through natural supplements.