Well, if you are a healthy person between the ages of 20-40 (an adult, but pre-menopausal if you are a woman) I'd suggest beginning at 1800-2000 calories and doing that for a few weeks. If you aren't seeing half a pound or so gone, lower the calories by 250 and try again.
We are our own science experiments. Pick a number and start testing! Just be sure to accurately calculate the calories of what you are eating (with a food scale and journal) and give it at LEAST three weeks before making any conclusions about whether the amount works for you or not.
That's where I'd start, for what it's worth.
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