I read Dr. Bernstein's book and think he has a lot of very useful information. Limiting carbs is key, but the type of carbs consumed is just as important.
For instance, Dr. Robert Lustig, who is against sugar/fructose and white carbs, suggested in an online interview that these white carbs and fructose are a major contributor to type 2 diabetes in the world. These highly processed carbs are great for shelf life, but bad for our bodies. He is in favor of eating brown carbs such as beans and whole grains. He says it is important to cut out all juice/sode and instead, eat the fruit which contains fiber. Fiber is the substance that makes us feel full. Juice is so easy to chug and it does not satisfy your hunger pangs.
A concern I have with Dr. Bernstein's diet suggestions is that he advises quite a bit of animal protein consumption. There has been a lot of recent findings that high consumption of animal protein can be linked to cancer. I watched the documentary Forks Over Knives which touches on this causal relationship. My son's pediatrician recommended the book "The China Study" which also provides data on the link between high animal protein consumption and cancer. I am not vegan, but I have been cutting way back on my animal protein consumption.
I don't have much confidence in the guidelines put out by the USDA or ADA. I think the important thing is to try different things and see how your body responds. I take information in from Dr. Bernstein, Dr. Lustig, etc and then make decisions that make sense for me.
I tried Dr. Bernstein's diet and it was not working for me because I dropped too much weight, even with insulin. I am starting to make the following diet decisions for myself:
1)Increase fiber- Foods high in fiber benefit the colon and slow down digestion and those high fiber foods tend to be brown carbs and vegetables.
2)Cut down on animal protein- Too much meat does not agree with my body's digestion. When I do eat meat, I try to get better quality meats like grass fed beef or wild fish.
3)Limit fat- There has been a link between fat consumption and inflammation in arteries. I don't want to cut all fat out because I find that fat helps me feel full, just like fiber. However, there are some fats that are better for our bodies than others.