Feeding Dependency is, in my opinion, the worst worded of all the powers in the book. Lets look at some of what it says:
- If you cannot or do not wish to spare consequences, then you must lose access to a number of your powers, up to a refresh cost equal to the amount of stress taken.
- These options can be combined however you choose. (Referring to loosing powers and taking consequences)
- If you have no powers left to lose and are taken out by a feeding failure, you are actually taken out.
To me, it is unclear form their wording weather you loose powers whenever you take stress (ie. do not absorb all stress with consequences), or weather loosing powers act as another type of consequence. I interpret it as the second option.
In your example 2, you would just take one point of hunger stress and suffer no other ill effects (or you could choose to loose access to powers or take a consequence, but that would be silly).
The reason I interpret it this way is because of the last bullet point. It says that in order to actually be taken out you must both have no powers left
and be "taken out" (which I interpret to mean take a hit that goes past your stress track, and not absorb it with consequences). So lets take an example, say a full WCV, with 6 refresh in inhuman powers and currently suffering no hunger penalties used all his powers. He would face a 6 shift attack, say his discipline was a 2 and he rolled 0, so he takes 4 stress, he chooses not to use any consequences. If you interpret this the first way (that he must now loose 4 refresh worth of powers) what happens? I have no idea, it appears the game breaks. So first you loose 4 refresh in powers (so 2 of his 3 inhuman powers), then what? How do you handle the 4 stress hit. He stress track has a length of 3 so we can't just mark it down, and since loosing powers is tied to how much stress you are taking they are clearly not behaving consequences, so they do not buy down the stress. So is he taken out since he has taken a hit that goes past his stress track? Well no, he is not, since he still has a power left he could loose, he cant be taken out (see bullet point 3). This interpretation produces a contradiction, so it cannot be correct.
I am aware that this does not exactly jive with what is said in bullet point 1, namely that "if you cannot or do not wish to spare consequences, then you must lose access to a number of your powers." However, directly after stating that you must loose power if you do not take consequences it states "up to a refresh cost equal to the amount of stress taken." This use of "up to" implies to me that you
could loose access to power of a refresh cost of
less than the amount of stress taken (since up to implies less than or equal to). The second bullet point makes me think that since you can combine loosing power and taking consequences however you choose that they should behave similarly.
So here is my interpretation: At the end of a scene where you used your powers or whenever you face a stressful situation and are compelled you face a hunger attack equal to the refresh of powers you used (or 1/2 the total cost of the affected powers) and defend with Discipline. If you win you clear your stress track, if you loose you take stress. If you cannot take this stress (the value of the hit is greater than your largest unfilled stress box) you can choose to either absorb the hit with consequences (and take any remainder as stress), or loose powers, treating them like they were consequences (So an Inhuman power would be like a mild consequence, you could also downgrade a Supernatural to an Inhuman to absorb 2 stress, or loose the whole thing to absorb 4 stress). You may not allow yourself to be taken out of you could loose powers instead (this is different from normal consequences, since you can choose to be taken out rather than take a consequence). Now the 3rd bullet point makes sense. Since if you have no powers left to loose and would still be taken you, you actually are.
Given all of this, I still think the power is poorly worded and abuse able. For example, a character with 3 discipline could use all 6 refresh of powers, eat the ~3 stress hit, then use one power next scene and clear his stress. This does limit you if you have to go all out for multiple scenes, but if you can ever afford to go easy the actual feeding part will never come up (so I would recommend to your GM to push you with multiple large conflicts in a row, or scenes where you take large stress attacks).
Finally, if you wanted to go the house rule way in order to fix these problems Sancta has a version
here and I have a version
here.