Changes in China's food security driven by nutrition security and resource constraints.

The food consumption structure of rural residents showed a trend of rapid upgrading and diversification, and the proportion of grain consumed decreased from 56.52% of food consumption in 1990 to 43.96% in 2019.

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Therefore, the pressure index of the NRF system in China was relatively stable as a whole from 2000 to 2019, and the disparity in the index between provinces exhibited a decreasing trend over the same time period.

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There is a notable trend toward upgrading food consumption, manifested in the reduction in plant-based food consumption and the increase in animal-based food consumption (meat, poultry, eggs, and dairy products).

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The state index value for the whole of China mainly showed an increasing trend.

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