I agree with you on this. I also come from a country with low income and a standard of living but with a cost of $0.57 per meal. I've never seen that in my country, at least $1 per meal. In the context of high inflation and crisis, high food prices, to get a meal at such a low cost, I doubt that food can't guarantee quality for our health. Unless OP is talking about a charity diner subsidized by charities.
A poor country is not a synonym for an undernourished or undernourished country. I used to travel the world often and a lot, visited about 50 countries, and I have something to say
For example Thailand. A beautiful country, indescribable nature, culture... and cuisine
Yes, a tourist usually sees tourist beauty. I like to travel away from the tourist centers on my own and see real life. I won’t say what the dollar rate is now, I was there when it was about 30-32 Thai baht / dollar. I'll give you a specific example. Phuket Island, small family restaurants on the waterfront, in the Karon Beach area. Lunch cost about 15-20 dollars. It was tom yum soup, king prawns, vegetables, beer, snacks,... Lots and delicious. But this is a tour area. If you go north, to less touristy areas, everything changes there. Yes, there are no king prawns and lobsters, but there are vegetables, eggs, chicken, pork, rice, fruits. There you can eat in a cafe for about 2-3 dollars, this is a full meal. And if you take not a cafe or small family restaurants, but what is called a "dinner" - lunch already cost 1-2 dollars. But lunch included a light broth with greens, rice, some seafood or meat, juices / fruit drinks ... Portions are not as huge as in the tourist area, but quality products, and quite enough for lunch even for me, with my weight of just over 100 kg: )
I was in Srilanka, Bentota. Dinner at the hotel restaurant - 35-40 dollars. Dinner in a restaurant on the beach - 10-20, drive inland - and dinner is already 3-5 dollars. And this is a complete meal, not only carbohydrates and fats, but also vegetables, meat, seafood.
Was in Mexico. At first I was in Cancun, then I went to see the country. In small towns, you could have a good meal with Mexican cuisine - for 2-3 dollars. But this is the price of a wholesome meal - vegetables, meat, corn tortillas, juices, fruits.
And I think that in other countries, with a not very high standard of living, the availability of good and healthy food is also not a very big problem, and you should not focus on the cheapest and most unhealthy. I agree only in relation to countries with a low standard of living and difficult conditions, for example, countries where there are not enough areas with less fertile land.