Because if you don't you feel bad, and you look bad. Also, it is much easier to pack for a vacation, because your clothes are smaller.
Proteing is an important nutrient in order for the body to be able to maintain its muscles, and every athlete needs that.
To maintain muscle.
I do regular skipping, cycling and maintain a healthy diet which includes green leafy vegitables and egg white.
maintain proper and balanced diet and do exercise regularly.
To maintain homeostasis of body .It is very important
to build your stamena so you can be fit
A ballerina body is one that is fit and on a strict diet to maintain a certain weight. An average sized female would be considered a large ballerina
How many what and please define 'it'
to maintain your mentally fit is that to eat from everything little not too much
You need to maintain a workout at a steady rate. There isn't a way to prevent your muscles from dissapearing over time but you need to keep them fit to keep them. I know that protein shakes can help you to gain muscle but it also may increase your your body fat if you don't burn it off. (I know this because I'm a track athlete and need to maintain fitness/muscle as well.)
you need to exercise because it keeps your body fit and healthy with good shape
Vitamins are needed because they work with other nutrients like minerals to maintain and heal the body.