Should I increase my calorie intake?

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I have been using My Fitness Pal to log about 1700 calories a day eating. I also exercise 5-6 days a week, pretty hard so I'm guessing I burn at least 300 calories per workout. So, I net around 1400 calories most days. I feel hungry a lot, and my workouts are usually relatively intense -- cardio and weight training. I'm very nervous to eat more calories because I would be scared of gaining, but I'm wondering if I should. Any help?

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