I completely agree with Gustavo. The model answer is 'hadn't eaten'. However, I think 'didn't eat' could work if you meant to say:
- I feel ill. I wish it weren't my habit to eat so many sweets.
Yes, I agree with you both. With "didn't eat," the sentence makes me want to laugh, though. With its expression of regret about an ongoing habit of eating too many sweets, it makes his having eaten too many sweets prior to his feeling ill seem an unavoidable accident, the product of a bad habit.
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