I've had type 1 diabetes for 29 years and this is by far the best diet for me. I started it January 2017 to lose weight but also found I had to reduce my insulin intake significantly. As a result it is much easier to control my sugar levels. Changing to an insulin pump did help with better control of my diabetes but it is much better now that I do keto. I lost about 20 lbs in 6 months but then had emotional stress with family stuff and I got off it because I eat my emotions. So I'm back on now and it's slowly working again, yay!
One thing I found too is the diet changed my menstrual cycle. It was coming a week before it was supposed to. I was on the pill for basically my whole life and never had a problem untill I started this diet. The strength of my birth control pill was adjusted to be stronger and that worked for me.

Keto diet is a pretty good one if you can keep to it. I was looking at being a nutritionist and so took courses on diet and nutrition and also interned with a dietician. I learned a lot during that time. I always go back to the Keto type diets because they are truly a good way to lose weight. Low carb diets are what doctors put obese people on whenever they are trying to get them to lose the pounds for whatever reason. Look up the diet for HCG, Gastric Bypass, Lapband, and the such. Also look at the diet that they put the patients on before they go in for the surgery. All low carb and high protein. Keto adds in the good fats.

All I suggest is that you see a doctor, get some basic blood work done and make sure you aren't deficient in anything and are all good to go. If your doctor tells you not to do it ask and question why. Ask if there is a medical issue that you have that will cause problems. Some doctors will say no to a diet because of their personal beliefs or because they are to push another diet plan that they get profits from for doing so. So, always question their reason for why they don't want you do do a diet and from there get a second opinion.

It can work very well for short term fat loss. Long term it's not the best thing to do although tilting your diet more towards protein, healthy fats, fresh fruits and vegetables while limiting excessive carb consumption as we get older is an excellent idea. Remember carbs are primarily our fuel and as we get older and our metabolism slows down we need less fuel. Also don't forget the exercise! Diet and exercise are each only half of the equation. If you do decide to go keto the first week or two are the hardest. I have never had cravings like when I went keto. Good luck!

I have some friends who did it - decent results for one. But I have way too many allergies to go this way.

I was just thinking about starting it. Any suggestions on a better website? Books?

I have seen many people lose a lot of weight quickly with this and know it corrects a lot of health problems. i slowly worked toward it then followed it religiously for 6 months. 7 gms carbs daily. Maybe not enough exercise. I lost 22 lbs then just stopped. I lost my motivation around Christmas and quit tracking