The food insecurity rates increased significantly in developing countries due to COVID-19. The main reasons are as follows: (1) Unemployment rapidly increased in the short run as a result of lockdowns and the public health response. The reduction in working hours leads to a decrease in household income. (2) Rising food prices also deteriorate the food security status in developing countries because food consumption accounts for a larger share of household expenditure. (3) Social welfare programs are not well structured in developing countries, making it difficult to utilize existing systems to help low-income households. International cooperation is vital for resolving the food security problem. Each country should stand for a free trading system and avoid restrictive measures. In addition, we need to raise agricultural productivity to stabilize food prices in response to increased demand for food.