If that caloric requirement can be met on one or two meals instead of 3 or more, you might not feel as much pain. If you can become what Mark calls a "fat burning beast" you might be able to do this easily. Personally that's just too few calories for me to stay sane day after day after day. I walk, ride my bike to work, do a calisthenics class and/or sprint every week day and hike at least once on the weekend. I considered that to be moderate for exercise. I'm only a couple years younger and a couple inches taller and the calorie count I got for maintenance was between 1700 and 2000. Perhaps there are different calculators with different results.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting bench press: 30lbs. Current bench press: 75lbs.