People become vegetarians for a number of reasons. Some people decide to stop eating meat because they want to be more environmentally responsible. Some people are bothered by the ethical implications of killing animals for food, and other vegetarians find the idea of eating meat undesirable. Luckily, there are many plant-based meat alternatives for vegetarians to enjoy. Vegetarians who love seafood will be happy to learn that algae can be turned into a tasty tuna alternative.