If human rights were transferred to animals, all people would have to become vegans, which would lead to major nutritional problems, at least in many poorer areas where nutrients and plant proteins are not available to a sufficient degree.
Of course you can also eat vegan, without adhering to the animal rights ideology. Presumably even the fewest vegans support the position of animal rights activists.
Like all vegans, they can not eat meat or other animal products such as eggs, milk and honey, and also no butter, milk chocolate, milk ice cream and egg noodles for example. However, there are many other rules.