In the past decades, indigenous leafy vegetables (ILVs) have played a significant role in household food security, especially in poor rural households. However, ILVs have been replaced by exotic cash crops in the contemporary world. This study was conducted to assess the consumption of indigenous leafy vegetables and their contribution to household food security of households in Limpopo and Mpumalanga provinces. The study used secondary data collected by the South African Vulnerability Assessment Committee in 2016. A total of 1520 respondents were selected using a multistage sampling method. The results from descriptive statistics revealed that most consumers did not produce ILVs but consumed them. Meanwhile, a small number of people produced ILVs yet did not consume them. The results from the Household Food Insecurity Access Scale (HFIAS) showed that a large proportion of the population experienced moderate food security while some of the individuals within the population experienced severe food insecurity. An endogenous switching regression model (ESRM) was employed to analyze the impact of the consumption of ILVs on household food security. The results revealed that only a few variables of the consumption of ILVs were significant and positive (household size, wealth index, and 'if the disabled person receives grants'). As a result, the consumption of ILVs had a minimal impact on the household food security of the Limpopo and Mpumalanga provinces. The findings further revealed that age, gender, and education variables negatively influenced the consumption of ILVs. Thus, the recommended programs must be established to educate people about the importance of consuming ILVs. Agricultural extension services must equally promote the consumption of exotic cash crops and ILVs. Lastly, policies can contribute by increasing the diversity of ILVs left at retail outlets through diverse production.

Keywords: endogenous switching regression model; food security; households; indigenous leafy vegetables.

在过去几十年里，土生叶菜（ILVs）在家庭食品安全方面发挥了重要作用，尤其是在贫困农村家庭中。然而，在当代世界中，ILVs已经被外来经济作物所取代。本研究旨在评估林波波省和姆普马兰加省家庭对土生叶菜的消费情况及其对家庭食品安全的贡献。该研究使用了南非脆弱性评估委员会于2016年收集的二手数据。采用多阶段抽样方法选取了总共1520名受访者。

描述统计结果表明，大多数消费者不生产ILVs但却食用它们；与此同时，少数人生产ILVs却并未消费它们。家庭食品获取安全量表（HFIAS）的结果显示，很大一部分人口经历了中度的食品安全问题，而部分人群则遭遇了严重的食品安全问题。为了分析ILVs消费对家庭食品安全的影响，本研究采用内生切换回归模型（ESRM）。结果显示，只有少数与ILVs消费相关的变量显著且呈正向影响（家庭规模、财富指数和‘如果残障人士领取补助金’）。因此，林波波省和姆普马兰加省的家庭ILVs消费对食品安全的影响力较小。进一步的研究结果还表明，年龄、性别和教育水平等变量对ILVs消费有负向的影响。由此建议必须建立相关项目来教育人们了解食用ILVs的重要性。农业推广服务也应同时促进外来经济作物和土生叶菜的消费。最后，政策可以通过增加零售点出售的土生蔬菜种类以及其多样性生产来发挥作用。

关键词：内生切换回归模型；食品安全；家庭；土生叶菜。