I suspect a large aspect of this is not merely caloric sufficiency (already an issue), but protein, for which much of the world remains deficient.

Protein, whether animal or plant-based, is both an essential macronutrient and sees far lower productivity than staple (carbohydrate) crops. The Green Revolution and following developments have seen major enhancements in the productivity of rice, wheat, and maize. Far less so of soyabeans, whether for human or animal consumption.

Beef cattle is amongst the least productive (and most desired) animal proteins. But pork, poultry, eggs, and dairy, as well as farmed fish also require feed, including protein-rich feeds, to develop.

(I'm not making arguments over the morality or benefits of meat vs. vegetarian or vegan diets, though that's also a concern, especially concerning land-use, degradation, and greenhouse-gas emissions, of which animal metabolism alone is a very significant source.)

Protein-deficient diets, especially amongst infants and children, are a major contributing factor to developmental and cognitive deficiencies. So improving global standards of living will be dependent on increasing overall protein availability.

Perhaps improvement in the quality of life (=wealth) of the population as well as population increase? The world is incredibly richer today than in 1992 (particularly Asia, which accounts for about 60% of the world's population).

Increasing worldwide living standards of living leading to increased consumption, and increased meat consumption?