Otherwise, don't overthink it.
I define it as number of steps from the original food to what's on your plate.
You're correct though. The term is very unclear and doesn't help people. Generally speaking the refinement process of carbohydrates and sugars means glucose hits your blood stream faster and increases inflammation. (These refined carbs are also more addictive, reduce insulin sensitivity over time and lead to obesity)
For an anti inflammatory diet think raw foods, whole grains, high fiber, quality protein, low amounts of complex sugars, NO refined sugars. Stay low on the glycemic index.
Basically, make your body do a little work to metabolize calories. No easy street.
Also don't fry with vegetable oils. Consume plenty of olive oil and fish oil.
I end up with cravings for sweet foods to boost my energy and will often find an excuse to go buy a couple bags of sweets so I don't feel so drained of energy.
Do you have any recommendations I can use to cut down on my high glycemic food intake?
Have you tried just toughing it out for a couple weeks? I've found that even just a couple weeks of abstaining from sugary things drastically lowers my tolerance for sweet things. Previously edible foods start tasting way oversweetened.
Maybe you could replace the sugar with slower-acting carbohydrates like porridge? It's actually quite tasty without any additives when made with whole milk.
As you drive carbs closer to zero, make sure you're eating plenty of fatty foods to provide an alternate, slower-burning energy source. Also, when massively lowering carb intake, drink plenty of fluids with electrolytes, as that often helps lessen the "keto flu" symptoms of your body's incremental transition to different metabolic balances.
There's a carb-craving feeling that's easy to confuse with true hunger, likely because for so long on a sugar-heavy diet your body has learned your blood-sugar levels have been correlated with actual hunger or plenty-of-energy. But you can remind your body that there's another pathway. I think it's a bit like recovery from an injury via physical therapy: you have to re-teach your muscle/joints that, yes, they can do the original/optimal movements, without pain, after they've spent a while receiving alternate signals.
Tackle sleep issues separately, with things like caffeine reduction, screen-time-at-night reduction, exhausting exercise during the day, a segregated quiet/dark sleep space, etc.
Good luck!
Just eating sugar makes you crave sugar. Don't even add it to coffee.