
Carbohydrate restriction is commonly practiced but seldom taught. Now, the authors provide a definitive resource for low carbohydrate living. They show how carb restriction can help you manage insulin resistance, metabolic syndrome and type-2 diabetes, as well as improving blood glucose and lipids while reducing inflammation, all without drugs.
That doesn't sound like the most scientifically-founded assertion to me, especially given that you're looking for scientific evidence for or against low-carbohydrate diets. I guess it also doesn't necessarily tell you whether low-carb diets are any good or not, so it's a red herring here.
A really great book that points out many studies related to low-carbohydrate diets (especially experimental studies comparing against low-fat diets) is "The Art and Science of Low Carbohydrate Living". Written by two scientists who've spent their careers studying this, they point out that almost all studies which show poor results and undesirable side effects from a low-carb diet only last a few weeks - whereas it takes a few weeks for humans to adapt to a diet like that, so a study must necessarily get over that hump before making any conclusions.
Furthermore, low-carb diets cause people to lose a lot of electrolytes, which is the main cause of bad side effects, and many studies do not tell their low-carb subjects to supplement with salts. Studies which last longer than a few weeks tend to show favorable outcomes, generally with fat loss exceeding low-fat diets and better adherence as well over the long-term. If you want more details, I'd recommend you get the book.
I understand the urge is great to talk about science exploration, but if your only source is reddit, you can easily accidentally propagate misinformation. Likely someone walked away from your post thinking that the brain will fail on ketosis because it doesn't have glucose (which is actually a common myth heard from physicians). They will never read this reply. I would highly encourage you to read a complete book before even attempting ketosis, otherwise you won't have the motivation and understanding of the changes in your body to make it worth your time.
If you want something light, read Keto Clarity. If you want a dense but approachable medical perspective, read The Art And Science of Low Carbohydrate Living. I've been in nutritional ketosis approaching a year, and I wouldn't recommend it to anyone who hasn't done their research on it.
