My sister is a vegetarian.  She calls herself a carbotarian though, lol.
Interesting! Does this follow her religious beliefs? Some are vegetarians due to their stance on animal rights.
No, it is not due to a animal rights stance.  She simply has never liked animal protein at all.
aesthetic, economic, or personal preference. There are variations of the diet as well: an ovo-lacto vegetarian diet includes both eggs and dairy products, an ovo-vegetarian diet includes eggs but not dairy products, and a lacto-vegetarian diet includes dairy products but not eggs. A strict vegetarian diet – referred to as "vegan" – excludes all animal products, including eggs and dairy. Avoidance of animal products may require dietary supplements to prevent deficiencies such as vitamin B12 deficiency, which leads to pernicious anemia.
atheist or agnostic. This would explain that although they are not explicitly Christian in their songs, their music does allude to many of their beliefs.
All members are vegetarians and are heavily involved with PETA. They set up tables at their concerts, which inform fans of the organization and their beliefs on animal rights. Matt Rhodes, in speaking about their activism, says that endorsing a cause was an essential part of the punk movement. Although that sentiment has faded over the years, And Then There Were None will continue