Guess I hit a nerve.
It doesn't really bother me what other people do and want to think; after all it's their body and health. However, I have gone through a hell of a lot of suffering and fear in dealing with the often destructive effects of diabetes, including a number of times almost dying, and my motivation is that I want to stay alive and live as long as possible without complications or suffering. In order to do that I have to learn, for myself, what is possible and necessary. Following quackery or some fad does me absolutely no good because the consequences of tricking my body will show up, regardless of what I want to believe. Diabetes takes no sides and doesn't care what theories we might have. It will only react to what works and whatever reduces the exacerbation of the complications. At the same time, do it wrong and diabetes will destroy me without the slightest bit of conscience. It is a disease of metabolism and lifestyle.
All I can do then is to learn all I can about what causes it and what I can do to prevent the causations that manifest the complications. I've been reading all I can for 15 years now. Initially, due to my having been indoctrinated with the low-fat dogma, I concentrated on vegetarian diets and low GI carbohydrates, cutting out almost all fat. That's what my doctors all recommended, too. It never worked. My diabetic complications just kept getting worse and my insulin doses kept increasing. My doctors had no idea what was causing it, and why I was gaining so much weight, in spite of my never having eaten very much and being very physically active (I ran 10 kilometers everyday). I first found out about the low carb diet when I read Atkins in the late 90's, but I didn't trust what he recommended, mainly because of the distrust I had in fat. It was only when I read, in 1999, the first paleo book that I came across, Ray Audette's "Neanderthin" (Audette had Type 2 diabetes and arthritis and cured himself of both by severely cutting carbs), that I began to question the dogma that I'd been taught since the mid-70's. I tried on and off since then to do the paleo diet, but doubt and lack of information kept me from diving in. Living in Japan, far from all the goings on in the paleo movement, made it doubly difficult to have any idea whether going this route was safe or sound.
It was only two years ago when a friend recommended Mark Sisson's "Primal Blueprint" that everything really clicked. He explained it in terms of the metabolism of insulin and when I read that and compared it to what was happening with my body, suddenly it all made sense. When I tried it out, it worked! Within a month a fungus that had completely taken over my right hand and right foot and the right side of my face, due to high blood sugars, completely disappeared. The gastroparesis that was ravaging my stomach and esophagus disappeared. My blood sugars normalized and my dose of insulin plummeted. I lost weight. My migraines disappeared. And for the first time in 20 years my insomnia disappeared (I have only had insomnia one time since I started the diet and exercise routine last June). I was astounded, to say the least. And so was my doctor, since I had managed to do in one month what she had been unable to do in 10 years. She still remains very cautious about the whole thing, and still won't read the copies of data and abstracts that I've brought in to back up what I was doing, but she's at least willing to let me give it a go, while monitoring me.
For me this is life or death, not simply a weight loss program. I cannot be cavalier about what I eat or how I live and move. Diabetes is on my mind 24 hours a day, even when I sleep. So yes, I'd imagine that when someone makes an offhand remark about all that I've put so much effort and time and anguish into learning, cavalierly brushing aside tomes of serious studies and very concerned work by people trying to make sense of two epidemics... diabetes and obesity... that are sweeping the world, I get somewhat defensive. All I am asking is that you give the information a serious look at and not just toss it out as hogwash. I'd go further and say, give the paleo lifestyle a try and see how it works for you, but if you are healthy and happy with your body and well-being, then it might seem rather unnecessary.
I do believe, as Nick and Piper have suggested, that living this way makes your body far more efficient. For backpacking that means less weight on your back, less consumption of fuel, and longer periods of walking without constantly having to replenish caloric stores with quick spiking sugars.