Whenever I hear those words, "I have no willpower," I think back to a personal development course we were sent on for work, run by the Pacific Institute of Chicago. I learned that everything in adult life is a choice I make and I am the person in control. I know it sounds harsh but actually you can resist temptation but, like tanith, you have to want to. While the pleasure of eating the seasonal treats is more important to you than the benefits of resisting, you won't stop. Think of it as a decision.
You decide to eat them. OR
You decide not to eat them. OR
You decide to limit them.
It's your choice. Simples!
(I love mince pies, pork pies, chocolates and other lovely things and I eat them in December but not on Tuesdays and Fridays when I'm fasting. That's my decision, my choice.)
By the way, I know there's an element of chance sometimes so don't come back at me with drunk drivers, homicidal maniacs, terrorist atrocities etc. It's a principle! 😀