Probably the only thing low-carb/high protein advocates and I agree on is that Americans eat to many processed carbohydrates, which is very different from saying that "carbs are bad!" Do most people even really know what "carbs" are, I wonder? Fruits and vegetables are also "carbs"!
And by the way, what is the most important organ in our body? The heart? No. The liver? No. The brain? BINGO! What does the brain need for fuel? Protein? No. Fat? No. Glucose from carbohydrates. Yes! And while the body can convert glucose from other things than carbohydrates, it's a hard job. The mood swings and "fuzziness"that people can experience on a high-protein/low carb diet is because of the brain suffering from what amounts to malnutrition! Proably not a good thing!
I think this craze is an example of people going to extremes. While it's good to reduce or even eliminate processed carbs (IMO...just assume that everything I say here is!)like white flour and white sugar, to put whole grains in the same category and try to eliminate them is ridiculous.
While Americans were/are eating too many processed carbs, they were also eating excessive amounts of protein in any case.
I just saw a big new display rack in the local Walmart that is packed with "low carb" foods, mostly Atkins. Same thing (but on a smaller scale) at the local Walgreens. (By the way, I know Atkins is dead, but what did he die of?)
I have tried some "special" hi-protein/low carb foods out of curiosity, and I'll tell you, there are certaiin things that are MEANT to have carbs! Like breads and chips. The "low carb" bread I tried was like chewing the rubber sole of a shoe (not that I've ever endulged in footware, at least not in a culinary manner). The chips were equally as wretched.
Interestingly enough, even though there are doctors who may endorse these diets (remember, thought, there are also doctors who smoke, and drink too much...), organizations such as the American Heart Association and the ADA are against them. Sure, they may result in weight loss, but at what long-term expense? If you look at epidemiological (populations studies) of diets around the world, the areas where people have less incidence of diseases like coronary artery disease and cancer are NOT areas where carbs are low and protein high.
I think that a balanced diet of 55-70% mostly complex carbs (unrefined); 15-20% protein (I used to think 12-15, but have increase that a bit) and 20-25% fat is the best.
Putting on my conspiracy theory hat (and whistling the "X-files" theme song), I'd say it's a rather interesting coincidence that the low carb (and in conjunction with that "high protein") craze started at a time when dairy and meat producers were losing profits because people were decreasing their consumption of animal products (a very good thing, IMO!).
As for the previous "low fat" craze. It *didn't* make Americans slimmer or healthier, because, like the "low carb" craze, it focused people's attention on only one thing--X is bad, and you should avoid it--instead of using a more holistic approach to encourage a balanced diet. A lot of the "low fat" foods (besides tasting wretched as well!) made up for the reduction in fat by upping the processed carbs like white flour and sugar. "Snackwells" cookies, for example, are low fat, but I think the calories are about the same, and there is probably not much in them that is nutritionally satisfying. And how many people gave them selves permission to eat a whole bag of "low fat" potato chips or cookies or whatever because they were low fat?
And low-fat or low-carb diets aren't necessarily focusing on healthy, "real" food (the kind the body recognizes as nourishment). I sometimes browse through the "diet" section of the supermarket (where some healthy real foods co-mingle with stuff that doesn't deserve the name "food") and look at the ingredients. Sugar and corn syrup are heavily used in the "low fat" foods, along with other weird non-food ingredients. (Like "Olestra" that undigestible fat substitute that is in "WOW" chips. As in "Wow, what's that in my underwear!")
Hmm..guess I have a pretty strong opinion about this, huh?