What does vitamine A consist of?

Is folate best absorbed from foods or from supplements? Hi protein foods? Why is Human nutrition important? What vitamin prevents some birth defects and can be found in green leafy vegetables liver and yeast? What are the helthy foods to eat? How many grams of sugar does a human body need in a day? Is loss of appetite a symptom of overtraining? How are food and air routed into the proper channels? Where does one find out about blood types and dieting? 12 years old and have 13 inch biceps also weigh 84 pounds and measure 5 foot 4 inches? What is Vitamin B12 also called? Did chloe from the Celtic women lost weight? What group of people need the most calories? How much should you weigh if you are 5'9 and 15? How many calories should you eat if you are 40 years old 5'2 and you weigh 150 pounds? What is dietary supplements for swimmers? Should a person eat if having a allergic reaction? How many calories are in a cooked sirloin? Is fabia fat? Are nuts bad or good cholesterol?