will I lose muscle if I have enough protein but still few calories?

You should weigh between 122 and 148 pounds.

If you are athletic then you should probably be eating more than 800 calories per day.

“What should a minimum calorie intake be?”

As a guide to minimum calorie intake, the American College of Sports Medicine (ACSM) recommends that calorie levels never drop below 1200 calories per day for women or 1800 calories per day for men. Even these calorie levels are quite low.

http://www.bmi-calculator.net/bmr-calculator/harris-benedict-equation/calorie-intake-to-lose-weight.php

Check out this calculator for how many calories YOU really need.

http://www.ahealthyme.com/topic/calneed

  Check out this link for exercise information:

http://www.fitstep.com/Library/Exercises/Exercises.htm

  Calories burned during exercise

http://www.nutristrategy.com/activitylist4.htm

Welcome to Fun Advice!

        Simply a Rose to brighten your day,         And maybe lessen the cares in your way;         And also, too, to help you to know,         That in knowing you, many others grow!

I understand where you’re coming from and 800 cals is fine, as long as you’re not exercising (but I thought you were an athlete).

protein shakes are great because they store energy but aren’t as hard to burn as fats. pay attention to the ingredients though, you don’t want powder with too much creatine, as that has the specific purpose to build muscle. you don’t want to build you want to tone.

outside of your normal athletic workouts get into a pilates class or do laps in a swimming pool. (make sure it’s an intense pilates/yoga class so it REALLY works you) these are great for making women’s bodies really lean.

p.s. if you can do 800 cals without skipping meals, great. make sure you’re eating in the morning, around lunchtime, and around six or seven though. skipping meals lowers your base metabolic rate and you will actually burn less calories throughout the day.