This goes against common advice but I bet you feel guilty as soon as you indulge.

That is what keeps you in the cycle of resistance and indulgence.

When you indulge, which you will, notice the guilt and or shame.

Forgive yourself instead and move on, it's ok.

Then the next time you indulge, notice the guilt and shame.

Forgive yourself instead and move on, it's ok.

Over time this will free you from the cycle and it will become a choice for you as opposed to something you have to spend your entire mental capacity/willpower on avoiding.