The keto diet doesn't just reduce them - it practically eliminates them. And it does eliminate entire food groups, which can be very difficult for many people to sustain over the long term.
This diet also be unaffordable for many people, since it emphasizes lots of free-range, grass-fed, lovingly raised, etc., etc., proteins and fats. And it leaves people at risk for vitamin and mineral deficiencies, since fruits and many vegetables are off limits.
I think this registered dietician has done a great job of summarizing the benefits and drawbacks of the keto diet, incorporating recent research on cardiovascular disease and other health issues:
https://www.abbeyskitchen.com/the-keto-diet-ketogenic/
Baloney. I get so tired of having to fight this fight, but here we go again.
Incidently, the grass-fed beef thing you claim is utter nonsense, although I do prefer the flavor myself. Eat whatever kind of beef or other animal-based protein you want, or can afford. True, one doesn't eat much fruit on a ketogenic diet (most fruit today is genetically bred to produce overly sweet varieties) but you get plenty of vitamins and minerals from plant based sources.
I really don't know why people claim it's an "extreme" diet or difficult to sustain. It isn't in the least. When you think about it, it's actually pretty simple: eat a little protein at every meal, along with plenty of non-starchy vegetables. Enjoy some fat, while you're at it. That's not so hard. Contrary to popular belief, you don't eat ZERO carbs. You just stay under 30 gms or so per day. You have to find a level that works best for your individual needs.
I think I've probably told my story no less than a dozen times here. In 2014 I was diagnosed with Type 2 diabetes. My A1c was 12.5 ("normal" is roughly half of that), my fasting blood glucose level was 330. Blood pressure, triglyceride levels... through the roof. I was also taking a high prescription dose of omeprazole to treat GERD. My doctor wanted to put me on insulin. I said no, that I wanted to try and control it with diet.
That was 4 years ago. The ketogenic diet immediately lowered my blood glucose and kept it down. I also lost 98 pounds. GERD... gone. Blood pressure is normal. Cholesterol levels are normal. Triglycerides under 90 mg/dl. Within 3 months, my A1c was down to 5.8, which is a normal range. Yes, no more diabetes.
After two years of being very strict, I began slowly reintroducing a few more carbs. I now eat about 50 g,s per day. I've put about 30 pounds back on since hitting my lowest weight, but I feel immensely better than I did before I started. And the blood glucose is still normal.
I don't want to sound like an infomercial, but the keto diet been nothing short of life saving for me... literally. My doctor, who at first had some doubts, is also fully behind it now.