Roni Neff

• PhD, MS
• Professor (Associate) at Johns Hopkins Bloomberg School of Public Health

Objective To examine the association between red and processed meat consumption and total food expenditures in US households and explore whether households could reduce food costs by substituting these meats with other protein sources such as poultry, seafood, eggs and plant proteins. Design Cross-sectional study using data from the National House...

Aligning institutional food procurement with planetary health targets offers opportunities to improve nutrition and reduce food-related greenhouse gas (GHG) emissions. This study compared foods procured by 19 university dining programs in the U.S. in 2022 with the EAT-Lancet planetary health diet. Each university’s procurement was then modeled to a...

Objectives To assess changes in food acquisition behavior, food insecurity, and dietary behavior and identify factors associated with fruit and vegetable (FV) consumption during the transitional period (before and after the initial vaccine rollout for all adults) of the COVID-19 pandemic. Design Successive independent samples design. Online survey...

Introduction Food-insecure households commonly rely on food pantries to supplement their nutritional needs, a challenge that was underscored during the COVID-19 pandemic. Food pantries, and the food banks that supply them, face common challenges in meeting variable client volume and dietary needs under normal and emergency (e.g., pandemic, natural...

Nearly 56% of the global population lives in cities, with this number expected to increase to 6.6 billion or >70% of the world’s population by 2050. Given that cardiometabolic diseases are the leading causes of morbidity and mortality in people living in urban areas, transforming cities and urban provisioning systems (or urban systems) toward healt...

Background The COVID-19 pandemic, extreme weather events, and the Russian invasion of Ukraine have highlighted global food system vulnerabilities and a lack of preparedness and prospective planning for increasingly complex disruptions. This has spurred an interest in food system resilience. Despite the elevated interest in food system resilience, t...

Introduction: The food-energy-water (FEW) nexus highlights the interdependencies between the systems that people rely on for these essential resources. For example, globally, over two thirds of freshwater withdrawals are used to produce food, and another 10% is used during energy generation. In addition, the food system uses one eighth of global ne...

Food loss and waste (FLW) is a major challenge to food system sustainability, including aquatic foods. We investigated aquatic FLW in the food supply of the United States, the largest importer of aquatic food globally, using primary and secondary data and life cycle methodology. We show that there are significant differences in FLW among species, p...

Background Weight‐loss attempts are widespread in the United States, with many using commercial weight‐loss diet plans for guidance and support. Accordingly, dietary suggestions within these plans influence the nation's food‐related environmental footprint. Methods We modelled United States (US) per capita greenhouse gas emissions (GHGe) and water...

The donation of unharvested or unsold crops to rescue organizations has been promoted as a strat­egy to improve healthy food access for food inse­cure households while reducing production-level food loss and waste (FLW). In this study, we aimed to assess the motivations, barriers, and facili­tators for crop donation as a FLW reduction strat­egy amo...

Background: The COVID-19 pandemic, extreme weather events, and the Russian invasion of Ukraine have highlighted global food system vulnerabilities and a lack of preparedness and prospective planning for increasingly complex disruptions. This has spurred an interest in food system resilience. Despite the elevated interest in food system resilience,...

Background The COVID-19 pandemic, extreme weather events, and the Russian invasion of Ukraine have highlighted global food system vulnerabilities and a lack of preparedness and prospective planning for increasingly complex disruptions. This has spurred an interest in food system resilience. Despite the elevated interest in food system resilience, t...

Translating agricultural productivity into food availability depends on food supply chains. Agricultural policy and research efforts promote increased horticultural crop production and yields, but the ability of low-resource food supply chains to handle increased volumes of perishable crops is not well understood. This study developed and used a di...

In Honduras, as in many settings between 2020 and 2022, food security was affected by the COVID-19 pandemic, climate change, and conflicts—what some refer to as “The Three Cs.” These challenges have had overlapping impacts on food supply chains, food assistance programs, food prices, household purchasing power, physical access to food, and food acc...

With “stay at home” orders in effect during early COVID-19, many United States (U.S.) food system workers attended in-person work to maintain national food supply chain operations. Anecdotally, many encountered barriers to staying home despite symptomatic COVID-19 illness. We conducted a national, cross-sectional, online survey between 31 July and...

Food loss and waste (FLW) is a major challenge to food system sustainability, including aquatic foods. Few data exist on aquatic FLW outside of small-scale fisheries, with major gaps in aquaculture species that make up half of global production. We investigated aquatic FLW in the food supply of the United States (US), the largest importer of aquati...

Catfish is the largest aquaculture sector in the U.S., and there is no peer-reviewed lifecycle analysis characterizing the sector's environmental footprint. This study estimates energy and water demand per kg of catfish, based on analysis of primary data collected from businesses involved in catfish farming, hatcheries, feed mills, and processing....

The COVID-19 pandemic changed the way people acquired food, including increased use of meal-kit delivery services. Investigators analyzed data from a national survey of US adults collected between July 2020 and September 2020, to describe new users of meal-kit services during the pandemic and explore associations between new use of meal-kits and di...

Fisheries and aquaculture are highly reliant on fossil fuels and must transition to renewable energy to reduce carbon emissions and meet global planetary heath goals. Here we assessed total and renewable energy use in farmed catfish and wild-caught salmon, two of the largest seafood sectors in the United States (U.S.). Interviews were used to explo...

Understanding the relative contributions of the environment to commercial fisheries and aquaculture systems is an area of intense importance as it quantifies the dependence these human dominated systems have on healthy and productive ecosystems. Measures of sustainability are required that include environmental support, use of nonrenewable resource...

Due to the high prevalence of childhood obesity, it is imperative to assess the relationship children’s access to food retailers and obesity. However, the influence of methodological decisions on these associations has been understudied. We examined relationships between different measures of geospatial food environment (using 4 data sources, and 2...

Scant research focuses on the resiliency of food supply chain networks to outbreaks, despite the estimated 600 million global foodborne illnesses annually. Outbreaks that cross country, state and provincial lines are virulent due to the number of people they can affect and difficulty controlling them. Research is needed on food supply chain network...

There is a gap in information in the literature regarding the energy and water embodied is seafood, especially wild catch fisheries. This work draws on primary and secondary data to assess, through a life cycle approach, the energy and water consumed to catch and process wild sockeye salmon in Bristol Bay, Alaska (USA). The Bristol Bay sockeye salm...

Background As “stay at home” orders were in effect, many US food workers attended in-person work during early phases of the COVID-19 pandemic, charged with maintaining normal operation of the national food supply chain. Despite establishment of a novel national paid sick leave policy, anecdotal evidence suggests that many U.S. food system workers e...

Currently, 40% of food produced in the U.S. is never eaten, leading to lost resources, economic costs, decreased food security, and the wasted food itself, which has immense climate and ecological impacts. However, unwanted food can be leveraged towards sustainability aims by, for example, diverting high-quality surplus to food-insecure communities...

Objective was to assess amount of/reasons for, unused food from client-choice and traditional food pantries through a prospective, observational study. Two weeks after baseline visits, clients estimated percentage of products consumed and reported why unused products were not consumed through interviews. Participants were 28 clients from Baltimore,...

Background The COVID-19 pandemic profoundly affected food systems including food security. Understanding how the COVID-19 pandemic impacted food security is important to provide support, and identify long-term impacts and needs. Objective The National Food Access and COVID research Team (NFACT) was formed to assess food security over different U.S...

Few food waste interventions focus on drivers distinct to particular food groups, such as seafood. Given suggestive evidence that seafood may be wasted at exceptionally high rates, and given its environmental, economic and nutritional value, this research provides insights into seafood-specific consumer food waste interventions. We performed three...

Background. The COVID-19 pandemic profoundly affected food systems including food security. Understanding how the COVID-19 pandemic impacted food security is important to provide support, and identify long-term impacts and needs. Objective. Our team- the National Food Access and COVID research Team (NFACT) was formed to assess food security over di...

Objective Explore consumer understanding of the food industry's 2-date labeling system and the relative effectiveness of messages in increasing understanding. Design Participant understanding of date labels assessed before and after random assignment to 1 of 7 messages explaining the meaning of the labels. Setting US online survey through Amazon...

Objectives: Explore workplace control frequencies and factors associated with U.S. food retail workers’ safety perceptions during COVID-19. Methods: An online, cross-sectional survey captured working conditions and safety perceptions among a large, national sample of U.S. food retail workers from July to October 2020. Results: Overall, 40.3% repo...

Since 2014, the Community Eligibility Provision (CEP) school meal funding option has enabled high-poverty schools nationwide to serve universal free breakfast and lunch. Evidence suggests that CEP has benefits for student meal participation, behavior, and academic performance. This qualitative study explores perspectives among food service staff (n...

Purpose of Review Optimization-based methods for the food-energy-water nexus can assist decision-making on critical infrastructure but are limited in scope and applicability. We provide an overview of optimization-based systems modeling techniques for operations researchers and systems modelers for the nexus. Recent Findings We find that the liter...

About 31% of post-harvest food available for human consumption is lost or wasted annually in the United States. Roughly one third (43 billion lbs.) of food loss occurs in grocery and other retail food stores. Supermarkets engage in food waste reduction, rescue, and recycling strategies, but little is known about frontline workers’ and department ma...

Addressing food loss and waste (FLW) globally is critical for both improving food security and mitigating environmental pollution. While there are numerous studies addressing FLW in terms of nutrition, food security, food safety, public health and the economy, there is only a small body of life cycle assessment (LCA) research aimed at understanding...

The COVID-19 pandemic has had profound impacts on the global food system, supply chain, and employment, which, in turn, has created numerous challenges to food access and food security. Early exploratory studies suggest significant increases in food insecurity in the United States. Comprehensive longitudinal research across multiple locations is ne...

This research evaluates the effects of a South Carolina (SC) policy, which changed the nutrition standards for foods served in early care and education (ECE) settings, on wasted food. A two-group pre-test/post-test evaluation was performed in ECE centers serving children age 3-5 from households with lower incomes in SC (n = 102 children from 34 cen...

Over the past decade, there has been growing interest in the development and production of plant-based and cell-based alternatives to farmed meat. Although promoted for their capacity to avoid or reduce the environmental, animal welfare, and, in some cases, public health problems associated with farmed meat production and consumption, little resear...

COVID-19 has disrupted food access and impacted food insecurity, which is associated with numerous adverse individual and public health outcomes. To assess these challenges and understand their impact on food security, we conducted a statewide population-level survey using a convenience sample in Vermont from March 29 to April 12, 2020, during the...

The aim of this study was to explore United States (U.S.) seafood consumption patterns, food sourcing, expenditures, and geography of consumption. We analyzed seafood intake and food sourcing using the National Health and Nutrition Examination Survey (NHANES) cycles 2007–2008 to 2015–2016 for US adults ≥19 years old (n = 26,743 total respondents; n...

Policies to promote healthy foods in early care and education (ECE) in the United States exist, but few have been prospectively evaluated. In South Carolina, a statewide program serving low-income children in ECE enacted new policies promoting healthy foods. We conducted an evaluation to measure changes in dietary intake among children in ECE expos...

Background COVID-19 has disrupted food access and impacted food insecurity, which is associated with numerous adverse individual and public health outcomes. Methods We conducted a statewide population-level survey in Vermont from March 29-April 12, 2020, during the beginning of a statewide stay-at-home order. We utilized the USDA six-item validated...

Objective To examine changes in sales of highly processed foods, including infant formulas, in countries joining free trade agreements (FTAs) with the US. Design Annual country-level data for food and beverage sales come from Euromonitor International. Analyses are conducted in a comparative interrupted time-series (CITS) framework using multivari...

Food rescue, the practice of gathering food that could otherwise be wasted and redirecting it for human consumption, represents a critical opportunity to improve food security and reduce waste. As global interest in reducing hunger and food waste grows, better insight is needed to assess and compare the effectiveness of different models of food res...

Undernutrition, obesity, climate change, and freshwater depletion share food and agricultural systems as an underlying driver. Efforts to more closely align dietary patterns with sustainability and health goals could be better informed with data covering the spectrum of countries characterized by over- and undernutrition. Here, we model the greenho...

Objectives: To understand potential climate implications of dietary patterns associated with commercial weight loss diets, we tested the hypothesis that different consumption patterns of six commercial weight loss diets would shift United States greenhouse gas emissions (GHGE) if followed on a large scale. Methods: An estimated 50-70% of adults...

Objective: To investigate the relationship between joining the World Trade Organization (WTO) and the availability of several commodities with both harmful and protective effects for the development of noncommunicable diseases. Methods: We used a natural experiment design to compare trends in the domestic supply of tobacco, alcohol and seven foo...

Introduction Food date labels such as “best before” and “sell by” are largely unregulated in the United States (U.S.), although new voluntary standards are coming into effect. A U.S. consumer survey was performed in April 2016 to inform policy and education activities related to date labels. Methods The survey was administered online to a national...

Background: Businesses and organizations involved in growing, distributing, and supplying food may face severe disruptions from natural and human-generated hazards, ranging from extreme weather to political unrest. Baltimore, Maryland, is developing policies to improve local food system organizations' ability to prepare for, respond to, and recove...

Baltimore, Maryland gained international attention in 2015 when police killed an unarmed Black man, resulting in a civil uprising across the city. Though city officials, community groups, and local academic institutions had already been working together to improve the city’s food system and plan for events that threaten it, the incident brought to...

Many natural and non-natural hazards threaten food security, especially in urban areas where growing populations place extra demands on the food supply. Ensuring stable food security before, during, and after disasters requires resilient food systems that can withstand and recover from disruptions. However, few U.S. cities have considered food syst...

In the United States, access to healthy foods has been an important area of investigation in the effort to alleviate the obesity epidemic. Access to healthy foods encompasses access to food stores that sell fruits, vegetables, and other staple foods at affordable prices. Small stores have been targeted as a venue for healthy food interventions beca...

OBJECTIVE Although previous research efforts have estimated the caloric value of wasted food in the United States (US), little is known about the amounts other nutrients contained in wasted food. Given that 31–40% of the food produced in the US is wasted, this food may contain substantial amounts of macronutrients, micronutrients, and fiber. This i...

Regular consumption of fruits and vegetables is associated with a decreased risk of cardiovascular disease and all‐cause mortality. Access to fresh produce is limited for individuals and families experiencing food insecurity. Emergency food programs, including food pantries, are important institutions for assuring access to nutritional foods for th...

Purpose of Review We describe evidence regarding human exposure to microplastics via seafood and discuss potential health effects. Recent Findings Shellfish and other animals consumed whole pose particular concern for human exposure. If there is toxicity, it is likely dependent on dose, polymer type, size, surface chemistry, and hydrophobicity. S...

Introduction: Multiple estimates suggest the Kingdom of Saudi Arabia (KSA) may have one of the highest rates of wasted food globally. The KSA has limited arable lands and scarce water and thus relies on extensive imports and food subsidies to meet food demand. Accordingly, waste and loss of food are a significant concern for food security. Materi...

Background: Food system function is vulnerable to disruption from a variety of sources. Disruption of the processes required for food provision may result in decreases in food security in affected communities. Currently, there are few tools that quantitatively predict or analyze food system vulnerabilities to contribute to food system resilience a...

Food insecurity is a complex phenomenon with biophysical, climatic, economic, and infrastructure facets. Despite this understanding, there are few stakeholder-based modelling tools that can capture these dynamics and thereby evaluate the direct and indirect impacts that climatic change, economic change, and policy interventions can have on food sec...

California’s farmlands yield a significant proportion of produce for the entire nation. An acute event, such as an earthquake, tornado, or wildfire, can severely disrupt food production in California, which may impact local and national food security. Additionally, a long-term event (e.g., drought) occurring in California may further decrease food...

For a variety of reasons, farms cannot sell or donate all the food they produce, and some food crops are lost from the food supply. Food lost at the farm level represents a substantial environ­mental, economic, and nutritional cost to the food system. Few studies have estimated amounts of food lost at the farm level in the U.S. We present a survey-...

Objective Excess meat consumption, particularly of red and processed meats, is associated with nutritional and environmental health harms. While only a small portion of the population is vegetarian, surveys suggest many Americans may be reducing their meat consumption. To inform education campaigns, more information is needed about attitudes, perce...

Objective Food insecurity is associated with toxic stress and adverse long-term physical and mental health outcomes. It can be experienced chronically and also triggered or exacerbated by natural and human-made hazards that destabilize the food system. The Baltimore Food System Resilience Advisory Report was created to strengthen the resilience of...

Background: Significant mitigation efforts beyond the Nationally Determined Commitments (NDCs) coming out of the 2015 Paris Climate Agreement are required to avoid warming of 2 °C above pre-industrial temperatures. Health co-benefits represent selected near term, positive consequences of climate policies that can offset mitigation costs in the shor...

Policies, programs, and projects related to agriculture, food, and nutrition can significantly affect public health. Health impact assessment (HIA) is one tool that can be used to improve awareness of the health effects of decisions outside the health sector, and increasing the use of HIA for agriculture, food, and nutrition decisions presents an o...

Urban farming – a type of urban agriculture focused on entrepreneurial food production – serves multiple functions in neighbourhoods; yet these are not well delineated. Expectations for urban farming often centre on traditional measures of economic development, potentially overlooking other benefits. Through a qualitative case study conducted in Ba...

Background: Previous research has estimated that wasted food in the United States contains between 1,249 and 1,400 kcal per capita per day, but little is known about amounts of other nutrients embedded in the 31% to 40% of food that is wasted. Objective: This research aimed to calculate the nutritional value of food wasted at the retail and cons...

Urban food systems have changed considerably over the past half century. Older adults' descriptions of place-based, personal food system history can help inform student learning and may contribute to expert understanding of food system change. Structural and social shifts in food purchasing and consumption contribute to diet-related disease and los...

Despite difficult working conditions, farmworkers in the United States are excluded from many federal-level labor protections. The exclusion of farmworkers from standards that apply to most other workers is referred to as agricultural exceptionalism. This exclusion was born out of the successful efforts of southern agricultural interests to exempt...

Food workers’ health and hygiene are common pathways to foodborne disease outbreaks. Improving food system jobs is important to food safety because working conditions impact workers’ health, hygiene, and safe food handling. Stakeholders from key industries have advanced working conditions as an issue of public safety in the United States. Yet, for...

Abstract Foodborne disease is a significant problem in the United States and around the world. Though research identifies diverse factors associated with foodborne outbreaks, one of the most common is poor worker health and improper hygiene practice. Research on social determinants of health indicates that living and working conditions play a role...

Overview This report, prepared in advance of the United Nations Conference of the Parties 21 (COP21) in Paris, reviews the scientific literature on the roles of reducing animal product consumption and wasted food in meeting climate change mitigation targets. Key findings  If global trends in meat and dairy intake continue, global mean temperature...

An estimated 30 percent of the global food supply is lost or wasted, as is about 40 percent of the US food supply. There are valuable synergies between efforts to reduce food loss and waste and those promoting public health. To demonstrate the potential impact of building upon these synergies, we present an analysis of policies and interventions ad...

Based on the average level of seafood consumption in the United States (U.S.), the 2010 Dietary Guidelines for Americans encourages citizens to double their intake to improve the health of their diets. The future availability of seafood, however, is threatened by overfishing, unsustainable seafood farming practices, ocean pollution and acidificatio...