Phew, glad that's over with! Actually, the leek soup diet has been over for about 48 hours now, and trust me, there is absolutely zero chance of it ever coming back. None. What. So. Ever. Nada. Zilch. It was THAT bad.
Not only are leeks a lot stringier when cooked than you'd expect, but the only real effect that I saw was having a miserable headache for two days. Blech.
On the plus side, though, I have been doing a lot better at controlling portion sizes, picking healthy foods, going to the gym, etc. We'll see what the year brings!