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Oatmeal is, but oat bran would not be.

Fibers are non-caloric, but are still considered a form of carbohydrate.

Fibers are “allowable” carbs. You can have as much of these as you'd want.

Another generally allowable carb is what is known as a “sugar alcohol.” These are in some natural sugar substitutes such as erythritol, allulose, xylitol and others, but are not in pure monk fruit stevia. Pure manufactured sugar substitutes like Splenda, saccharine, NutraSweet, and others don't have sugar alcohols, either, but strangely can cause spikes in insulin in the body, which can make your body partially behave like you are ingesting carbs, even though you aren't.

Many sugar substitutes, either the natural or manufactured ones, have a binder that is a carbohydrate. The big bags of Splenda, for instance, have Splenda molecules attached to maltodextrin, a starch. Maltodextrin is 100 on the Glycemic Index, while white sugar is in the high 70s, meaning maltodextrin is the same effective thing in our bodies as the blood glucose we make to stay alive. However, the fluffy maltodextrin in such bags of sugar substitutes are still so minimal in calories that such sugar substitutes can still keep one in the parameters of their super low carb diet, with limitations.

Technically, a keto diet is a super low carb diet in which people have fewer than 30 fully digestible grams of normal carbs a day. This forces one into ketosis, which makes your body burn fat over carbs. People who are not severely diabetic or having bad problems with their liver can make all the carbs their body needs through their liver (this happens to some extent to all humans every day, naturally, as we turn fat stores back into blood glucose for energy).

People wanting to prove their body is using fat can buy “keto strips” and test their urine at home.

Generally, when a person's body is changing over to a keto diet, within two to three days, you will likely become quite sleepy, followed by becoming energetic again. This is a natural feeling as your body's cells finally switch to the fat backup system they have.

When your carbs come only from fat and and some protein (yes, your body, through your liver, can also turn protein into blood sugar), you will never get more blood sugar than you need and never have more insulin than it needs.

If you have unusual health conditions, it is wise to talk to a doctor before trying such a diet.

I hope this helps. I will say your appetite goes away and you naturally are much less hungry than on a normal diet.