Here is an initial LeptiGen chart. This is a simplified version -- you may have to make adjustments based on length and severity of dieting, as well as you genetics (the longer and more severe you have dieted, the higher the dose you would want, and the higher your bodyfat setpoint, the higher the dose you will need). The numbers given is for a fairly average individual, who would start having problems losing fat in the 10% range.
Men:
<6% = 9 teaspons/day
6-8% = 7 teaspoons/day
8-10% = 5 tsp/d
10-12% = 3
12-15% = 2
15-20% = 1
>20% = 0
Women -- subtract 6% to bodyfat levels and use corresponding dose -- i.e., if you are 20% bf, use the amount for 14% (2 tsps/day.)
These numbers are assuming a moderate (500 calories) deficit. You should add 1.5 teaspoons per 500 calories below this moderate deficit.