If I get about 800-900 calories a day?

Probably doing the traditional 1200 to 1500 calories is best. You do not want to put your body into starvation mode where it actually hangs onto calories for survival and slows your metabolism .

1200 is the minimum recommended intake for a sedentary woman. If you're also exercising, you're supposed to eat those back too. 800-900 is too low, even without the exercising.

That isn't enough to maintain your health. If you are serious about losing weight and want to remain healthy while you are doing it, you will stick to a minimum of 1200 cal a day even if you sit on the couch all day long while you are doing it.

And if you get a little curious, check out the information on this website, get checked out by your doctor and get informed about the realities of losing weight safely.

You'll definitely lose weight, but there's the inevitable prospect of long-term sustainability and metabolism damage.

I agree. She isn't promoting a diet. She is just looking for information. MFP offers great support and tools to help you succeed. That's why we are all here.

Any diet below 1200 cal. is extremely dangerous. My Fitness Pal offers a Basal Metabolic Rate calculator. MFP uses this to calculate how many calories you should take in every day to lose your goal weight safely.
"Your BMR (Basal Metabolic Rate) is an estimate of how many calories you'd burn if you were to do nothing but rest for 24 hours. It represents the minimum amount of energy needed to keep your body functioning, including breathing and keeping your heart beating.
Your BMR does not include the calories you burn from normal daily activities or exercise." (from My Fitness Pal BMR Calculator).

Keep exercising, focus on eating healthy, and use the tools on MFP to help you. You can do it, just be patient. Remember, beauty is not just about the scale. I like to focus on not just my weight, but my nutrition and exercise goals--lower sugar and salt intake, exercise 45 minutes per day (walking, heavy cleaning/housework, food prep/cooking all count towards that goal).

Good luck, Parastu95!

It's not true that a diet below 1200 is always extremely dangerous. What about short people? They need way less than the ridiculous 2000 calories maintain diet. Heck I'm 5'6 and would gain weight since my bmr is 1600.

wendyborg90 wrote: »

It's not true that a diet below 1200 is always extremely dangerous. What about short people? They need way less than the ridiculous 2000 calories maintain diet. Heck I'm 5'6 and would gain weight since my bmr is 1600.

the chance that you would gain on 2,000 calories a day at 5'6" with a BMR of 1600 is ridiculously small. If your BMR is 1600 that's what you'd need to intake in order to maintain your current weight if you were laying in bed unconscious. It's what is needed to keep your heart pumping, your brain functioning, your body temperature regulated, and so on. If you so much as open your eyes, your calorie need goes up from that BMR. Let alone if you sit up in bed, or walk to the bathroom, brush your teeth - or exercise in the smallest way. You need a better understanding of how this all works.

There are very few people who should be eating that low with calories. In fact, it is usually limited to morbidly obese (under doctor supervision) or those with medical conditions like hypothyroidism (especially if sedentary) or very short sedentary women (especially older). The issue you will have at that calorie point is you will lack getting adequate nutrition as PearlAng mention. But considering the OP is a very young and active women, her needs are probably double that.

OP, side note, I would drop the treadmill down to two or three days and replace the other days with resistance training. It's important to work both the cardiovascular system and work on preserving your lean body mass.