Whenever I hear people say this, I'm really sceptical. Does this mean never buying any products with animal ingredients? Nothing that has butter or milk, no ice cream, never a turkey sandwich or anything with egg or gelatine in it, like candy? Because if you do, they most probably don't come from farms certified for their animal welfare.
I'm not trying to attack you personally, it's just that I suspect that you either exclude the majority of animal products you consume, or you're one of the rare people that never buys anything with a list of ingredients.
If you're the latter, that's great, because I think that's a very good way of knowing exactly what you eat. I want to get better at eating from basic ingredients myself, where I snack on things like an apple or nuts and not something with 5-10 ingredients.