I would question your nutritionists qualifications by giving that type of advice. If you are working out and burning as much as you said (7000-9000), then 1300 calories isn't enough fuel or nutrients for that level of activity and it would cause your body to go into perceived starvation mode. If you haven't already, I would recommend you update your calories burned goal to be what you burn in an average week so that your nutrition goals are accurate for your activity level. This page has info on how to update that: www.sparkpeople.com/community/help_answer.
You may also find these articles helpful:
Why Calories are King: www.sparkpeople.com/resource/nutrition_art
Calorie Calculation 101 (This explains how our site calculates your calories): www.sparkpeople.com/resource/calorie_calcu