@Anita, there are no problems with the lifestyle. The issue is people mix the banting with old way of eating. (oh, lets have a pizza, or a cake on the weekend.) This messes with your macronutrients and eventually the way your body processes your food.
I converted my personal physician who at first though it was a fad.
I only eat Saturated fats, moderate protein and lots of veggies (MY CHOLESTEROL IS PERFECT, HbA1c is that of a non diabetic)
Stay away from any sugars and processed carbs
Doctors hate the lifestyle because it goes against what they have been taught for many years.
Did you know that the biggest selling drugs in the world are statins?
Yet, we are suppose to eat low fat this and that, eat vegie oils (that are hydrogenated and chemically changed), we are told to base our diets according to the food pyramid, yet the world is getting fatter and we can't out gym/run a bad way of eating.
We are quick to look for escape goats, like "ooo, my parents have fat genes"
Have you looked back on any old photos of your grandparents, where they fat?
In the late "50's we had a man called Ancel Keys that changed the way our world thinks, by proclaiming fat as bad, and so the world followed along with tons of disease.
If you can read the book "A big fat suprise." by Nina Teicholz. Brilliant book.
Most drug companies sponsor studies supporting low fat diets, coke sponsors many dieticians and fitness experts.
In the end the world is slowly dying.
I will never revert to my old way of eating, banting has saved my life and I know many, many more. No doctor will tell me I am wrong when my blood tests and results have spoken for themselves.
And, yes, I feel that strongly about this.