Is it bad for my net intake to be about 1000calories?

I am female, 5'9 tall, 19 years old, large bone frame/muscular build, and 140ish lbs. I exercise a lot and burn close to 1000cal per day in that alone. I eat 2,000 so that makes my net intake only 1000. Is it really that bad? Do I need to be eating more?For exercise, I run 3-5miles daily (sometimes twice daily...so anywhere from 30min to 2hr of running), walk anywhere from 1-3 hours per day, plus I do about 20min of strength exercises at night before bed. I rarely take days off....maybe have taken one day off in the past month and a half?

How to Set a Weekly Weight Loss Goal

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your body needs at least 1100 calories for normal body functions to not go into starvation mode. so always take that into consideration, then a net of 1000 calories might actually put your body into starvation mode which stores as much energy as it can find as fat.i'd recommend using the website it use. it's www.fatsecret.com. on there you can log all of the exercise you do and the calories you can take in, you can even log sleeping and resting etc so you know quite accurately (obvioulsy not 100%) how much calories you should take in. and they give you a recommended daily calorie intake based on your activity level and weight and length. this way you can also check that you are burning more calories than you are consuming IF weight loss is your goal. it's also excellent for weight maintenance and gain.i hope this helps! it helped me a lot