: Can I skip carbohydrates altogether? I'm currently following the Paleo Diet for a few months now, and I've skipping on the carbohydrates, although I give myself some "free" days to let myself eat fries or rice maybe once

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Carbohydrates have gotten a "bad rap" in the last several years. For every article or non-standard diet that demonizes carbohydrates, you'll find an equal number that doesn't. Notice the discrepancy with the first answer posted here.

Except under conditions of starvation, it was thought that the brain
always had an ample supply of glucose. "While this is the case in
terms of consciousness, the new findings suggest that glucose is not
always present in ample amounts to optimally support learning and
memory functions," said Gold, who is director of the Medical Scholars
Program in the University of Illinois College of Medicine.

Any Registered Dietician will tell you that removing all carbohydrates from your diet is not a good thing because carbs are an essential nutrient. Not only do they provide energy, but, they assist in brain functioning. And, while there's no agreement on the long term efficacy of zero carbohydrate diets, the potential implications are widely known.

The best that you can do for yourself is to become knowledgeable on how certain foods affect you because, regardless of popular opinion, there's no such thing as a universal diet that meets the needs of all people.

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Lyle McDonald wrote a while back that he doesn't feel carbohydrates are necessary at all, because glycogen can be provided by fat and protein. From the article:

The second criterion is the reason that dietary carbohydrate is not an
essential nutrient: the body is able to make as much glucose as the
brain and the few other tissues need on a day-to-day basis from other
sources. I should mention that the body is not able to provide
sufficient carbohydrate to fuel high intensity exercise such as
sprinting or weight training and carbs might be considered essential
for individuals who want to do that type of exercise.

So it depends a bit on your activity level. You won't find many high level athletes who don't eat a single carb.

Expanding a bit, gluconeogenesis allows for glucose to be created from fat and protein. "Do I need carbs?" is a very different question from "Do I need glucose?"

Additionally, eating truly zero carbohydrates is nearly impossible. Most foods, including whey protein powders, have trace amounts. You're asking a theoretical question (which is fine), but outside of laboratory conditions it's not really going to happen.