I eat essentially zero carbs, what I do eat is offset by the fiber in the food that contains the carbs.
Fiber doesn't
offset” carbs.
Fiber actually is carbs, but in a form that we cannot digest. It's counted in the total carbs on the nutrition label, but you subtract the amount of fiber from the total carbs to get the amount of carbs that will actually be processed into your blood as sugar.
Fiber is mostly cellulose, a form of sugar that is indigestible to us. Almost any chemical that ends in
“…ose” is a sugar.
Then there are sugar alcohols. Not actually sugar, and not actually alcohol, but for some reason, they're call sugar alcohols. Also count as carbs, and they do somehow get processed into energy, but without raising your blood sugar level. I don't really know how that works out that way. Most prominently used in diabetic-friendly candy, because in addition to being sweet, they also have similar physical properties to sugar, such that applications that depend on sugar for their physicals structure can be made also with sugar alcohols. The video below, from some years back, is of me cutting up some sugar-alcohol-based (probably sorbitol) sugar-free candy, and feeding it into a cotton candy machine, showing that it behaves in a physical manner similar to that of sugar.
Sugar alcohols tend to have a nasty side effect on the digestive system if you eat very much of it.
Nearly all chemicals that end in
“…itol” are sugar alcohols.
Oddly, sucralose (AKA Splenda®) is not counted on nutritional labels as carbs or sugar, even though technically, it is.
As a diabetic, it is fortunate for me that most modern automobiles use fuel injection instead of carburetors, as it is necessary for me to be wary of excess carbs.