If you want to end world hunger and drive down food prices then it's that simple, everyone would just need to convert to a plant-based diet. But people don't want to end world hunger enough to give up their meat, so this is where we are
There is so much missing/wrong with this. Contrasting things with India? Which grains are these people eating? Are they the ones pioneered by Norman Borlaug and made possible by American science? I'd say western but in this case we have a citizen who has made a tremendously positive impact worldwide and is something more of us should strive to emulate. What about the impact of current farming methods draining aquifers to feed other countries who are arguably unsustainable. America exports 50% of its wheat. As far as countries with food issues, maybe those are the ones that should worry about how many people they can realistically support, or is that asking too much of a government? This is as insightful as listening to someone say how the world is over populated, who isn't living in one of the overpopulated countries, and suggesting ridiculous things like not having any children despite the population growth being negative without rampant immigration. Why aren't these people the first in line?
Contrast that with India, where the average person consumes 440 pounds of grain per year and has very little meat in their diet
I enjoy Indian food. The thing about food is cost, and until very recently the vast majority of India was extremely poor (they still are, just slightly less). Not poor by western standards, but true poverty levels. Not to mention the Caste system and their religious beliefs which factor heavily into their diets. As their economies grow and people better themselves their diets change, we're already seeing this with China as well. India is an extremely filthy place where many people shit wherever and bathe where they ditch bodies. It has a rich history but using it as an example of agriculture and diet to be emulated is hilarious. I implore you to look at those photos and take note of the livestock compared to the people.
You're ignoring how some of these countries exist in shitty areas (deserts!) as well as the logistics issue. Africa is a giant tribal cluster fuck of humanity and the issues there don't simply stem from meat, it's an ugly social problem. Our ancestors were completely aware of how valuable land was for this very reason. As far as a wholly plant based diet what about b12, you know that vitamin that keeps your hair from falling out, why is this an issue with this allegedly superior diet?
I really wish we could all get along, there is so much we could achieve. Unfortunately this is contrary to human nature, we're wired to be tribal. This should underline the importance of advancing as a culture and why it is important to strive for excellence (see Norman). As an example look at how Japan has embraced western things coming up from wooden armor and swords 150 years ago to steel high rises and mastering industry. Life isn't fair. Nature is an equalizer and I'd like to think that eventually things will improve for everyone with the steady march of progress. The issues you've mentioned about diet and distribution are multifaceted issues that are more social than technological at this point. We still have some growing to do