A human has no daily carbohydrate requirement, we have a fat and protein requirement but we do not need to consume carbs. It has been in the medical literature for well over a century, IIRC...almost two. The advantage of being omnivores is that we can subsist on virtually anything, many people survived famines on carbohydrates but they became, of course, malnourished. The deadliest thing people consume are seed and vegetable oils, the hydrogenated and non-hydrogenated sugars/syrups are a close second. Every word on food packaging has an approved definition, enriched means the processing stripped so much nutrition out of the food that nutrients had to be added back. That is why most experts recommend shopping the periphery of the store... meaning meat, fruits, vegetables, and some dairy only. There are several other items that are ok such as nuts, beans etc but sprouting or fermenting are necessary for proper digestion and nutrient absorption, what our ancestors figured out. Glyphosate is also a growing problem so organic is what should be consumed, albeit it can get cost prohibitive. Non-GMO doesn't mean pesticides and fertilizers weren't used so again, organic is best since something as simple as oats are loaded with Glyphosate...the Non-GMO testing higher amounts than the genetically engineered oats.
Personally I do not advocate a particular diet and most can be harmful if not implemented properly. However, I do advocate against being a devout vegan as that can permanently damage ones body especially when back filling with lots of soy etc. There is a really good book from a former devout vegan, The Vegetarian Myth by Lierre Keith. She discusses how she destroyed her thyroid and the other ailments she developed, it is also extremely well referenced. Does that mean one cannot be a vegan for a period of time to help clear up some issues, of course not...I have a friend that did just that. I also have friends that too have permanent damage from being long term vegans, I fortunately switched to being a vegetarian in the 90s after being a vegan for only a couple of years. I later went on a whole grain low fat diet for many years, developing a couple medical conditions that should have not been possible based on my diet. Switching to mostly animal sources for fat and protein has enabled me to manage my conditions entirely with diet. I'm on a quest to remove them entirely, why I'm a member here.
I want to end with, if you must take supplements due to a particular diet, that way of eating is not natural. If ones diet does not provide all of the nutrients needed then I recommend a change. The closer to the source, plants and animals, the better the nourishment. If you have a need for carbs, eat vegetables over processed food. For those that can't live without bread, learn to make it yourself (a decent bread maker is worth it) and shop for organic grains that have undergone minimal processing. Red Wheat, White Wheat Berries etc can be bought whole, allowing them to be soaked and/or sprouted before being ground. A great source of information for the ancient, or proper, way of processing food is the Weston A. Price foundation. Getting back to a more whole foods diet will take more time but it'll also return the kitchen, instead of the TV, as the heart of the family.