Earlier quoted context omitted.
An easy way to get most of the way there: - Minimal to no fruit (that includes tomato). - Don't eat anything that comes in a package or that has an ingredients list more than 1 item long (so, frozen broccoli is fine, as long as there's no extra stuff in the bag). - Don't eat anything that your great grandparents wouldn't have had access to. Some things, like bell peppers, will start tasting like candy after a few wee…
But bell peppers have sugar, they are berries. I've done keto and had success holding sugar under, say, 10 to 12 grams. But getting to absolute zero and eating plenty of fibrous veggies is tricky.
The first line in my comment is 'almost all the way there'.
Absolute zero is not really necessary for anything...