How many calories should I eat if I weigh 140 am a 5 feet 2 inches tall female and want to lose weight?

First, the key to losing weight is not just counting calories. You need a plan-- a combination of the right diet, exercise, and support. A good diet involves avoiding empty calories (sodas, fried foods, and junk food, for example) and eating foods that are healthy-- fruits, vegetables, low-fat yoghurt, lean meats. You can cheat now and then and have dessert (it's not that one piece of cake that put the weight on you); but the important thing is to have a goal that you can reach each week.

I cannot tell you how many calories are best for you to eat, since I don't know other factors about you, like your general health, your family history, and whether you've tried to lose weight before. That is why seeing a doctor will be helpful, as he or she knows you and can give you some good advice. Normally, losing a pound a week is realistic. This may sound small, but it gives your body a chance to adjust to new and better eating habits. Fad diets or starvation diets usually mean you will just put the weight back on, so avoid the "magic cures" and make a long-term plan that will guarantee your success. Seek out a dietician (your doctor can refer you to one), who will help you set calorie goals. If possible, go to a program like Weight Watchers, which will support you in learning to eat healthier. And find some time for exercise because that will help you burn off calories too. With a sensible plan and some patience, you WILL lose weight.