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What do Veterinarians Know About Nutrition?

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The real issue is not so much what do general practice veterinarians know about nutrition as what is the evidence supporting the alternative theories and products being promoted? The accusation that vets know little about nutrition, even if it were true, doesn’t invalidate their criticisms. The classis ad hominem fallacy is the strategy of attacking a person and imaging that somehow this attack says anything about that person’s argument. It is the mirror image, in many ways, of the appeal to authority fallacy, which involves claiming some special wisdom or expertise on the part of a person making an argument and then imaging that claim somehow proves the argument. If proponents of raw diets or other unconventional nutritional approaches wish to make a case for their ideas, they have to do it based on logic and facts, not on the presumed expertise of supporters or the supposed ignorance of critics. As always, it is the ideas and the data that matter, not the people involved.
That said, there is a certain hypocrisy to many of these criticisms in that they come from sources with no particular right to claim expertise in nutrition anyway. Proponents of alternative nutritional practices are almost never boarded veterinary nutritionists. Often they are lay people who have labeled themselves as experts without even the training general practice veterinarians have in nutritional science. And while they may not be influenced by the mainstream pet food industry, this only means they are less subject to that particular bias, not that they don’t have other biases. People selling pet food or books on veterinary nutrition are all too often blind to the hypocrisy of claiming their opponents are under the influence of pet food companies while ignoring the fact that they make money selling their own ideas or products.
Others who frequently claim most veterinarians know little about nutrition are themselves general practice veterinarians or specialists in some aspect of veterinary medicine other than nutrition. It may very well be true that they are well-informed about nutrition because they have an interest in it, but this is not evidence that their arguments are true and those of their opponents are false. It is not even evidence that they know more about nutrition than their detractors, who may themselves have studied independently in the area. If you’re not a boarded nutritionist, you can’t claim to be an expert. And whether or not you are an expert, your ideas must stand or fall on their merits and the evidence, not on any presumed superiority in your knowledge over that of your critics.
So I think it is fair to say that most general practice veterinarians have only a fairly general knowledge of veterinary nutrition. And it is fair to acknowledge that much of this information comes from a source with a significant risk of bias, that is the pet food industry. However, I see no evidence that proponents of alternative approaches to nutrition have a reason to claim they know more about nutrition than most veterinarians, or that they are free from biases of their own. Only boarded veterinary nutritionists can legitimately claim to be “experts,” and even this is no guarantee of perfect objectivity or the truth of everything they believe. Claims about who is or is not smart or informed enough to have an opinion on a subject are mostly a superficial distraction from the important elements of any debate, what are the arguments and data behind each position. Awareness of potential bias only serves to make one more careful and cautious in examining someone’s arguments and data, it doesn’t get one a free pass to ignore what they have to say.