Tried to adjust the rate of scaling, couldn't come up with anything good.
Made a tiny clarifying edit instead.
I'm planning to toss this onto the list, unless someone convinces me otherwise. Which wouldn't be very hard. I encourage you all to do it if you feel this version could be improved somehow.
"New" version:
FEEDING DEPENDENCY [+varies]
Description: Some or all of your powers come from eating something. Probably something weird.
Skills Affected: Discipline.
Effects:
Restricted Powers. When you take this power, you must select at least one other power that you possess. You must also choose a thing and an amount of that thing that you must consume in order to use those powers. Which powers and foods may be selected with this power is a matter of the GM's discretion. This power provides a variable Refresh rebate depending on how much power is selected with it. If 2 Refresh is selected, the rebate is +1. If 6 Refresh is selected, the rebate is +2. If 10 Refresh is selected, the rebate is +3. And so on. The above values assume that the food is rare or morally objectionable, like significant amounts of human blood or huge piles of cash. If the food is acquired easily and without guilt, or only with extreme measures, add or subtract an appropriate amount from the Refresh total used to calculate the rebate. If more Refresh is attached to this power than is required for the rebate received, this power provides a free mild hunger consequence for each additional Refresh.
Feeding. You are capable of consuming whatever your food is. Furthermore, when you do so, you may remove any hunger consequences that you possess and recover any powers that you lost to your hunger. If you consume an insufficient amount of your food, you may receive partial benefits at the GM's discretion.
Limited Reserves. At the end of any scene in which you use one or more of your restricted powers, you must roll your Discipline skill against a number equal to the combined Refresh value of the restricted powers that you used. If you fail this roll, you must take consequences or sacrifice restricted powers with a total Refresh value and/or stress value equal to the amount that you failed by. If you do not or can not, you are taken out. This usually means that you die, get incapacitated, or go mad with hunger, but other fates are also possible depending on the character and the situation.
Adjustments for easy or difficult foods:
-4 A few hours of sunlight, other small downtime requirements
-3 Normal food in unusually large amounts, other stuff that's no real effort
-2 Weird stuff like copper, large amounts of downtime like sleeping for a week straight
-1 Diamonds, people singing about you, other stuff that's impractical but not really difficult
0 Blood, rare radioactive materials, other difficult stuff, massive downtime like spending months in prayer
+1 Vampire blood, other difficult and dangerous stuff
+2 Human sacrifices, other stuff that's a big deal, ridiculous downtime like meditating for a decade
+3 Angel feathers, other stuff that pretty much requires a quest
+4 Planets, other nearly impossible stuff