A ketogenic diet is unhealthy
Eating the amount of sugars that most Americans do is absolutely unhealthy.
I know that I feel a billion times better when I reduce my carb intake, even not to ketogenic levels. Further, doing a ketogenic diet for about a year got me down to a weight low enough that I could exercise more regularly and effectively, with fewer injuries. Never mind the emotional health changes associated with not being an obese 20 year old.
I started when I was 17 and spent a week in one of the top children's hospitals in the country for unrelated things — all the doctors there were very approving of what I was doing.
I tried keto for close to a year and my blood sugar shot up to being pre-diabetic. Why was that? Medium-Chain Acyl-CoA Dehydrogenase (MCAD) Deficiency[1]. It produces an enzyme that is involved in breaking down fat from food and stored body fat into energy. Because people lack this energy source, affected individuals must keep their blood sugar levels up by eating regularly to avoid acute episodes of lethargy, seizures and coma. The condition can lead to sudden death unless it is diagnosed and proper dietary interventions are followed.
So when you're keto, eating lots of fat and little carbohydrates, which doesn't keep your blood sugar up, you can get into trouble.
Is keto unhealthy for everyone? No. Is it healthy for everyone? Definitely not.
[1] https://en.wikipedia.org/wiki/Medium-chain_acyl-coenzyme_A_d...
Sure, and it's good to be aware of, but I would still classify something that poses a risk to 0.025% of the population as "almost certainly safe." Anything could be harmful to 1 in every 4000-17,000 people.
Sorry that happened to you!
Couldn't think clearly at all, felt much better when returned to my sugar-taking habits.
I really don't understand why suddenly all this sugar-bashing.
I had about 3 weeks of brain fog and crappy feeling, and then felt 120% better. It's quite literally a withdrawal that you're experiencing.
And because it's been linked to diabetes, obesity, dementia, tooth decay, etc? And we're only putting more and more of it into our food?
Tooth decay is a problem, of course, but you just have to clean teeth more often. I know no valid links to dementia, except on sugar scare sites. And sugar is tasty, and quite natural for me. (I experimented what foods give me the most weight gain; pure sugar and sweets are not exactly bad, compared to, say, white rice).
I am a vegetarian, I gave up meat quite easily, without any withdrawals, and I felt benefits immediately, but living without sugar looks unimaginable for me. Perhaps it's withdrawal, but I didn't feel _any_ positive effect, none at all.
I don't have an opinion either way, but there's a lot of science that contradicts your statement: