> I'll demolish a jar of it in one afternoon with a spoon

I sympathise: my mouth snacks on autopilot* if I'm not careful. I can still remember the day when I'd bought a packet milk chocolate biscuits, and the first I realised I'd opened it was when I was about to throw the empty packet away. The fix at the time was to transition to plain chocolate bikkies, so I'd be more likely to notice myself eating them.

Nowadays, if I can't exercise my won't-power, I break the bikkie in half, and put half back in the packet: that way, the aftertaste will last me nearly as long, and it's the aftertaste that's most of the enjoyment for me. Herself gets dischuffed at me when she finds half a biscuit in the packet, but then she doesn't have to buy biscuits as often.

* I'll save for elsewhere the discussion of why autopilots are called "George" in the trade.