Many Hindus, Buddhists, Jains are strict vegetarians and have survived for milleniums. So I wouldn't say it is an extreme cultural view of diet and unnatual.
Vegetarian diet actually have been considered healthier as incidence of heart and cardiovascular diseases , cancer are comparatively lower for vegetarians as opposed to nonvegetarians.
Research has also shown that vegetarianism is associated with lower incidence of cancer, cardiovascular diseases and better immune system.
http://www.pcrm.org/health/health-topics/foods-for-cancer-prevention
Vegetarianism can reduce risk of heart disease by up to a third | University of Oxford
And it is also great for the environment, and helps reduce global warming.
https://www.theguardian.com/environ...-vegetarianism-dangerous-global-warming#img-1
How going vegetarian will help save the world
Sri Sri Ravi Shankar: We should stop polluting our planet. Say no to plastic, Use as little plastic as possible. Recycle..Use recycled things. Use chemical free shampoos and soaps as far as possible. Go organic, I would recommend everyone to become vegetarian. You know, if we pay attention on the consumption that takes place to produce one non-vegetarian meal, feeding the animal etc.., it is equivalent to 400 vegetarian meals. So, I recommend everyone to turn vegetarian. Environmentalists say that if even 10 percent of the population turns vegetarian, we will not have the problem of this green house effect.
So, even from a secular perspective, you can see that vegetarianism can contribute a lot.
Imho, vegetarianism also cultivates a culture of non-violence and sensitivity, which are potent qualities or virtues in itself and necessary for a healthy human society.