For 3 days at a time, I wouldn't worry about it. This "starvation mode" that people talk about does not have an on/off switch--it takes time and is a process. I have read that because most liquid diets are so low in calories, they should not be followed for more than 6 weeks at a time. 6 WEEKS!
I wouldn't go that low for more then 3-4 days a week only for fear of not getting enough proper nutrition. Just listen to your body--so long as your hair isn't becoming brittle/falling out, your nails aren't becoming brittle/yellow, you don't feel completely drained of energy, or any other symptoms of malnourishment, you should be fine.
Besides, you said your maintenance calories are much higher, so as long as they're at least 1400, then you do 1000 half the time and 1400+ half the time, you'll still average 1200+ a day, which is the minimum typically suggested.
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