Fat Acceptance
Obesity is at an all time high in most of the developed world, with an average rate of about one in five people in OECD countries, and nearly one in six children being at least overweight. These disturbingly high rates of obesity are a result of not only our increasingly sedentary lifestyles, but our caloric rich diets (which incidentally involve an abundance of animal products, however it's still possible to be an obese vegan).
Despite not only conventional wisdom but also the scientific consensus making it abundantly clear that being obese is VERY bad for your health, there exists a movement that disputes the importance of weight on health, who refer to themselves as "Health at Every Size." Pointing out that being obese is not healthful and is a lifestyle that ought to be discouraged instead of encouraged tends to lead to accusations of being "fatphobic" and "sizeist".