Would a 900 calorie a day diet be i good choice?

the amount of calories needed by one person is not the same for everyone...we are all built differently, with diff. metabolisms, levels of activity, etc. Mypyramid.gov will help you make healthy choices, track your food intake and tell you what amounts are right for YOU. 

900 calories is not enough for any human being, no matter how inactive they are, or what they eat. You need at least 1800-2000 just to live and keep your body functioning....that is what your body expends in energy to keep you alive. 

Most people trying to lose weight are often surprised to learn that eating less can sometimes slow down your metabolism and therefore slow down the amount of weight loss. Most weight loss experts agree that when you eat very small amounts of calories, the body "thinks" that there is not enough food available and will slow down your metabolism in an attempt to conserve energy. 

Therefore, it is possible, that eating too little can actually slow down your weight loss. 

This weight loss theory is fairly simple to follow. When the body does not have enough calories it will do everything it can to conserve the best stores of energy that it has. This means that it is possible that the body will, instead of using up the reserves of fat and making you thinner, actually start to burn the muscle tissue so that it can maintain a reserve of fat. 

One possible way to make sure that this does not happen is to make sure that you are eating enough food to keep your body from believing that it should go into starvation mode while, at the same time, control your caloric intake so that you will achieve the weight loss that you desire. 

There is not an answer that will suit everyone as to how many calories is enough to help with your weight loss. The best way to work out what is best for you is to visit a qualified nutritionist or weight loss expert who will be able to tell you the most appropriate amount of calories for your dietary requirements. 

Although your metabolism can slow down when dieting to achieve weight loss, it is believed by many that exercise can speed up your metabolism. This may help in two ways. First, the metabolic rate can be higher when exercising and therefore help to burn off those extra calories. Also, exercising can lead to more muscle which can help burn more calories because muscle burns calories more quickly than fat. 

Therefore, while it's true that some people naturally have a fast metabolism, there are things that you can do to speed up your own metabolism that will have a positive effect on weight loss. 

Also, to burn more calories or get a faster metabolism, you need to increase your amount of muscle mass. Cardio will give burn off calories as you do the workout, but when you have muscles, you burn fat and calories all the time...even when you aren't working out. When you eat too few calories, your body will start to burn muscle tissue to survive....losing muscle is never a good thing.