Dont listen or take notice of the others. Do what you want, eat what you want.... it's still a free country with regard to your diet last time i checked... the only thing which will "limit" or "control" your diet, will be your own wallet and gullet...
btw, havent noticed a sardine shortage..... i'm a pilchard person... although not in the quantities you consume
as for the animal huggers out there, as long as it is legally sold, it is for anybody to buy and eat, and you have no right to judge. If you want to make it illegal to farm in certain ways, then i suggest you stand for election or lobby your own representative. Because anybody can find something "immoral" about any aspect of your OWN life if they try hard enough. So stop throwing stones, least your crack your own windows....