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That's right up my alley. All I could eat was sweets.
I kicked the habit by eating nothing but sweets.
The trick was that I weaned myself off of sweets.
Took a couple of months, but now, years later, I have no problem with sweets at all.
My shut off time for not eating is 7 to 8 PM. So if I were you will be to pick a shut off time for not eating, then eat a piece of chocolate before your deadline.