If you proposed global harmonisation of food to equalise costs and ensure equitable access to food, apart from "but that's socialism!" complaints nobody would mind. Wastage in food production and distribution is huge. Economies of scale are real.

What people object to here isn't the efficiency, it's the motivation and the profit.

I don't think US tobacco firms diversifying is bad, personally. I'd rather they sold food than cigarettes. But, they want to sell high fat, high sugar, high salt PROFITABLE foods to people worldwide, not actual nutritionally balanced good food (good as in healthy, not moral).

Ultra processed foods have a long shelf life. That's part of why they are efficient. If they applied the same logic to shipping soy protein, vitamin rich fresh fruit and vegetables, meat and dairy produce, would that be wrong just because they're called "Philip Morris"?