I've been thinking for a long while, now, about how to stitch together the many threads of thought around diet, nutrition, environment, and economics:

1) eating a plant-based diet is healthier (Mark Bittman), or at the very least, eating natural things (Michael Pollan)
2) eating meat costs more, and it threatens the environment (http://www.marketplace.org/topics/sustainability/commentary/...), including in China (http://www.pbs.org/newshour/rundown/2012/11/china-meat.html)
3) for that matter, others foods besides meat that come from animals (ex: dairy) have the same effect. Roughly 75% of the world has some degree of lactose intolerance (http://en.wikipedia.org/wiki/Lactose_intolerance)
4) nutrition is more than calorie counting -- it is about getting nutrients in the diet (http://supplementsos.com/blog/how-to-actually-eat-healthily-...) Lentils play an important part as a quality, cheap source of protein.
5) there are ways to make good food affordable to the people who can least afford it (http://www.kpbs.org/news/2012/jul/28/new-mobile-food-truck-s...) In fact, the idea (or 'business model') of making necessary things affordable to the people who can least afford it as been around for 50 years (http://infinitevisionaries.com/)
6) a very important factor to incentivize people to switch diets is knowing that the food will taste good. While it might involve a slight change in cultural diet, this is absolutely possible (http://www.openthemagazine.com/article/international/the-dos...)
7) the vegetarian diet of Tamils in Tamil Nadu (India) and Tamil Eelam (Ceylon) is wide & varied, largely dairy-free, and mostly gluten free. This largely applies for the other South India states, too. The diet consists in large parts of lentils, leafy greens, vegetables, and spices.
8) in particular, the diet in Tamil Nadu/Tamil Eelam of 50 years ago should be examined, which is before the Green Revolution occurred in India. Back then, many of the healthier grains eaten in large quantities by a large swathe of people (millet, sorghum, finger millet, etc.).
9) An unintended consequence of the Green Revolution in India and China in the 1950's is that, at least in India, many of the healthier grains eaten in large quantities by a large swathe of people (millet, sorghum, finger millet, etc.) were dropped in favor of the far less nutritional white rice, which was for many just a once-in-a-while treat. In North India, the favored, newly-proliferated crop of choice was wheat. (Both rice and wheat are dreadfully water-intensive.) Brown rice doesn't exist there, but in the region, only people in Kerala and Tamil Eelam eat a red rice that is similarly nutritious. Of course, this is said to be not as nutritious as things like finger millet or "thinai" (similar to quinoa).
10) People talk about the importance of vitamin B12, and that you can only get it from animal based sources. But this diet has been around for 4,500 years, people have been just fine. (http://www.slate.com/articles/life/food/2013/01/indus_civili...) I'm sure people have been vegetarian for at least 2,000 years of that, if I judge based on the Thirukkural (2,000 year old literature of virtuous maxims, of which 10 talk about not eating meat). There are athletes and body-builders in America who are vegetarian and vegan.

So I really think that a restaurant (or at the least, food truck) should pop up selling a variety of vegan Tamil food at a very low price. This would solve so many problems. I've been thinking of this for a long while now, but I would be just happy if someone 'steals' the idea and runs with it.

(note: I'm sure there are other ways to achieve low cost, high nutrition, vegan diets in varied, tasty ways, but this is part of my birth tradition. You can treat that as a disclaimer / proof of authenticity. For me, personally, I'm fairly lactose-intolerant, and I'm wondering now that I might be gluten intolerant. I've been trying to be more vegan/vegetarian for the past 5 months, and it's helped a lot in my finances. It hasn't negatively impacted exercising. I'm hoping to see more change once I start cooking!...)