1500 seems low to me, but if you're feeling energetic and are happy on that, I wouldn't change it up over half a pound. If you find you are hitting a wall in your workouts, tired all the time, hungry all the time, or your weight sticks for several weeks in a row, then my reaction would be to up the cals. From what you're saying right now, though, you have been doing fine on 1500, so I wouldn't think you need to change anything right now.
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