It is widely recognized that postharvest losses in agriculture have a significant impact on the sustainability and security of the world’s food supply. This essay aims to investigate the reasons behind these losses, their effects, and possible solutions. Several factors, such as insufficient infrastructure, inadequate storage facilities, improper handling procedures, and limited market access, are analyzed as potential causes of postharvest losses. The discussion primarily focuses on the negative consequences of these losses on farmers’ livelihoods, food supply, and resource utilization, as well as the economic, environmental, and social implications. The paper suggests several strategies to minimize postharvest losses, including strengthening value chains, promoting appropriate technology for processing and storage, enhancing farmer education and training, and upgrading transportation and storage infrastructure. Additionally, the significance of market processes and policy interventions in reducing losses is highlighted. By reducing postharvest agricultural losses, it is expected that food security, resource efficiency, and sustainable development will be improved.