"Scientific research continues to show that a plant-based diet is a healthy dietary pattern. In fact, previous versions of the Dietary Guidelines for Americans have emphasized plant-based diets, and the 2015 Dietary Guidelines Advisory Committee appears to be supporting these previous conclusions."
I'd heard this before, after the US Dietary Guidelines Advisory Committee (DGAC) held their third public meeting on the subject this past May. The fourth meeting is scheduled to be held on the 17th and 18th of July, and there's an opportunity to participate online, if you're interested.
It does seem that plant-based diets -- which are usually, although not always, synonymous with vegetarian or vegan diets -- are gaining favor in terms of public perception of their health benefits and sustainability. While I value the contribution vegetables, fruits, and nuts make to our diet, I disagree that most people would benefit from adopting a diet consisting solely of plant foods and have written about this before. And I'm disappointed that low-carbohydrate diets aren't being presented as an alternative at this point, particularly for the many groups of people who would benefit from them.
However, I dislike the confrontational and accusatory messages I've seen from many advocates on both sides in blog posts, comments, and social media sites. I'm passionate about carbohydrate restriction (apparently I'm not supposed to use this phrase to describe myself, but I think it fits), and I get upset when people criticize it and make claims about the superiority of plant-based diets too. But in my opinion, being respectful of the other side -- who are often equally committed to their way of eating -- while letting the evidence in favor of low-carbohydrate diets speak for itself, is the best way to go.
You may have already seen the debate between Dr. Eric Westman and Dr. T Colin Campbell held at the University of Alabama held in the spring of 2013. Both of these men have put many years into researching the effect of diet on various aspects of health. Each strongly believes that his way is the healthiest and most sustainable even though they are quite different. Dr. Campbell's view is that a plant-based, low-protein, low-fat, high-carbohydrate diet provides optimal nutrition, while Dr. Westman favors an eating plan that is very low in carbohydrate, moderate in protein, and high in fat. I encourage you to watch the video if you haven't already, or even if you have. Notice how Dr. Westman seeks to find common ground with statements like "There's more than one way to achieve excellent health," and then goes on to present the large body of evidence --including randomized clinical trials -- supporting carbohydrate restriction for diabetes, metabolic syndrome, and obesity, with early but promising research on ketogenic diets for cancer and neurological disease. I strongly agree with this approach and feel it's what will ultimately allow for more flexibility in the Dietary Guidelines -- specifically, including low-carbohydrate diets as an option.