And science with an agenda is to be suspect. Neal Barnard (whose work I've cursorily followed for some time) has agendas.
http://www.activistcash.com/organization_overview.cfm/oid/23I'm aware that the source is an industry mouthpiece with its own rather obvious agenda, but it reports things worth considering, and I'm just googling quickly:
The Physicians Committee for Responsible Medicine (PCRM) is a wolf in sheep’s clothing. PCRM is a fanatical animal rights group that seeks to remove eggs, milk, meat, and seafood from the American diet, and to eliminate the use of animals in scientific research. Despite its operational and financial ties to other animal activist groups and its close relationship with violent zealots, PCRM has successfully duped the media and much of the general public into believing that its pronouncements about the superiority of vegetarian-only diets represent the opinion of the medical community.
“Less than 5 percent of PCRM’s members are physicians,” Newsweek wrote in February 2004. The respected news magazine continued:
(PCRM president Neal) Barnard has co-signed letters, on PCRM letterhead, with the leader of Stop Huntingdon Animal Cruelty, an animal-rights group the Department of Justice calls a “domestic terrorist threat.” PCRM also has ties to People for the Ethical Treatment of Animals. An agency called the Foundation to Support Animal Protection has distributed money from PETA to PCRM in the past and, until very recently, did both groups’ books. Barnard and PETA head Ingrid Newkirk are both on the foundation’s board.
New York Times columnist Joe Sharkey put it more crisply in a November 2004 piece about PCRM’s annual airport-food ratings. “The physicians’ committee has a PETA link,” he wrote, “and its food rankings reflect that agenda.”
... The American Medical Association (AMA), which actually represents the medical profession, has called PCRM a "fringe organization" that uses "unethical tactics" and is "interested in perverting medical science."
Like or dislike the agenda, it's an agenda.
I feed a diabetic who also needs cholesterol meds -- diagnosed suddenly as Type II at the age of 49, and as Type I three years later. When he was first put on insulin, and we got thrown temporarily onto the 45 grams of carb per meal crash diet to get his rising blood sugar levels under control, one of the first things I did was eliminate our big glass of milk with dinner -- about 15 grams of precious carbs, and "bad" carbs at that. (I do now take large calcium supplements.)
Obviously, anyone who continued to drink milk would be having a hard time getting enough nutrition on the remaining available carb allowance, and would quite likely take in more carbs than someone who didn't drink milk, just to get the same amount of actual food. But not all dairy products are equal. Without cottage cheese, with half the carbs of milk, we'd have a hard time ever having dessert -- I am the queen of cheesey jelly delite: many varieties of uncooked cheesecake sweetened with aspertame and fruit. I haven't figured out how to make tasty desserts with turtle beans yet. We also eat very low-fat -- but that includes things like skinless chicken breasts and very lean meats.
I'm suspicious of the results of this study because there was obviously no control over, or data collected about, the subjects' actual food intake. I wouldn't be making any choices based on the study alone.
Simply cutting out dairy products would indeed probably make the vegan-diet subjects much more likely to be eating fewer carbohydrates. There are other ways of accomplishing the same goal, and if measures with the same effects were implemented by people not on a vegan diet, I can't imagine why essentially the same results would not be observed.