Vegetarianism is the consumption of plant-based diets (fruits, vegetables, etc.), with or without the inclusion of dairy products or eggs, and with the exclusion of meat (red meat, poultry, and seafood). Abstention from by-products of animal slaughter, such as animal-derived rennet and gelatin, may also be practiced.
There are many reasons why people prefer to opt for vegetarian diet. Many object to eating meat out of respect for sentient life. This motivation is due to various religious beliefs, along with the concept of animal rights. Other motivations for vegetarianism include health, political, environmental, cultural, aesthetic or economic. There are varieties of vegetarian diet which may include eggs but not dairy products, diet which may include dairy products but not eggs, and vegetarian diet which may include both eggs and dairy products. A vegan diet excludes all animal products, including eggs, dairy, and honey.
While some vegetarians are not aware of some animal-derived by-products in the usual production like cheese, marshmallow or gelatin and may unknowingly consume the product, some vegetarians may not be bothered by its consumption. The results of a 2009 International survey suggest the standard definition of vegetarianism is different in different nations. Vegetarians in some nations consume more animal products than those in others.
For Omega 3 found in fish oil in order to maximize production of DHA and EPA we can take flax seed, flax seed oil, canola oil, tofu, soybeans, walnuts and soy milk as a substitute.