在中国讨论最多的应该是food safety,也就是中文的“食品安全”。safety是指the state of being safe from harm or danger,即某物本身的安全性。
Food security是另一个概念。Wikipedia对food security的解释是“Food security is a condition related to the ongoing availability of food”,即“食品持续供应的保障”。也符合security的本义:protection from danger/bad situation.