Food waste from households and street markets in Zimbabwe

Background and Objective

Reducing food waste occurring at market and consumption level of the food system is a global challenge that must be addressed to achieve sustainable consumption and to cut the significant ecological footprint of this waste. In this doctoral thesis, the determinants of food waste in a developing country, focusing on low-income households and food street markets, are analysed.

The study characterizes the different types of food waste, estimates the amounts that are wasted, and investigates the causes of waste as well as spatiotemporal variations in food waste in a low-income community.

Target Group

Households and Street Markets

Approach

We will collect food waste data from households and from a street market in the same neighbourhood. One question is if the household behaviour and preferences related to specific time periods may be used to explain food waste occurring at the corresponding street market. Thus, the study examines household food consumption behaviour, attitudes, and perceptions as well as the spatial location of the household at specific times of the year. Consequently, we derive practical community-based recommendations to reduce food waste in low-income communities.

Data and Methods

A mixed-methods technique was applied in the study to collect both qualitative and quantitative data. The study combined a diary survey, a questionnaire survey and waste composition analysis in data collection. The kitchen diary survey allowed participants to record the types of food wasted and the reasons in real time. On the other hand, the waste composition analysis provided data on the quantities of discarded food. The questionnaire survey gathered information on participants' sociodemographic characteristics, food-related practices, and waste streams. By combining diary surveys and waste composition analysis we can estimate the quantities of what is being wasted and examine the spatiotemporal variations in food waste.

In the first round of data collection conducted in the harvest season (May-June 2023), 75 households participated in the waste composition analysis and kitchen diary surveys, additionally, we conducted 200 face-to-face questionnaire surveys. At the street market level, food waste from 33 market stalls was sorted and weighed and 25 vendors participated in the face-to-face questionnaire surveys. Our second data collection phase was in the lean season (October-November, 2023), where the same methodology was applied to collect data. 75 households participated in the waste composition analysis and kitchen diary surveys and 200 in the questionnaire surveys. However, due to the changes in the waste management system, a bulk sample was analysed from the street market, from approximately 80 stalls. 14 vendors participated in the questionnaire survey.

Our Research Questions

1. Which types of food are wasted in households and at street markets, and which quantity is wasted?
2. What are the causes of food rejection and food waste in low-income communities?
3. How does food waste vary through space and time in Hatcliffe?
4. Are there sustainable community-based intervention strategies for food waste reduction that can be adopted in low-income communities?

Preliminary Results

Preliminary results

Household food waste amounted to about 330 kg, averaging 3.19 kg per household per week or approximately 46 kg per capita per year. The waste primarily consisted of leftovers from cooked foods like sadza (a thick maize porridge), pasta, rice, and kale, with sadza being the most frequently discarded item. Cooking too much and serving larger portions than needed were the common reasons for food waste. Cultural norms and personal preferences also influenced food waste generation; for example, plain sadza and black tea were often deemed less valuable and thus more likely to be thrown away. However, some households used traditional preservation techniques such as drying, salting, smoking, and fermenting to reduce waste. The reasons for food waste will be examined using a social practice approach.

At the street market level, around 1,400 kg of food waste was sorted and weighed. Tomatoes, bell peppers, cucumbers, bananas, and citrus fruits made up the most of the disposed items. Key reasons for disposal included overstocking, lack of refrigeration, and limited storage space. Financial constraints of consumers and high competition among vendors further reduced demand, leaving more products unsold. Seasonal factors also influenced waste generation: intense sun and heat during the lean season damaged fresh products, while rainy weather introduced moisture that spoiled dry goods. Maintaining quality under these conditions was challenging for vendors, resulting in substantial avoidable waste.