I think no refined sugar will be my starting point if and when I ever reintroduce carbs. I've always exercised pretty consistently, I didn't have much weight to lose when I started the diet, and I still eat a load of cheese - so I think it's probably my best guess as a starting point.

Coffee is a funny one - I've never been able to make a direct correlation between that and sleep (it doesn't seem to have too much effect), but when I cut coffee down to (for the most part) a single cup in the morning, I now notice that a second cup will give me jittery legs.

I'd argue cutting refined sugar is good for everyone, and probably the easiest place to start when you're trying to lose weight / live more healthily. Replace sugary coke with a sugar free version, or put less sugar in coffee (that's how I started); the cravings, if you have them, will gradually diminish.

I believe cheese fits in a keto diet as well. If you want to adjust that a bit, go for hard / old cheese instead of soft ones. Also go for real cheese, none of that "sandwich slices" stuff in unrefrigerated plastic packaging.