Addressing the carbon footprint, healthfulness, and costs of self-selected diets in the USA: a population-based cross-sectional study

BackgroundThe Planetary Health Diet Index (PHDI) measures adherence to the dietary pattern presented by the EAT-Lancet Commission, which aligns health and sustainability targets. There is a need to understand how PHDI scores correlate with dietary greenhouse gas emissions (GHGE) and how this differs from the carbon footprints of scores on established dietary recommendations. The objectives of this study were to compare how the PHDI, Healthy Eating Index-2015 (HEI-2015) and Dietary Approaches to Stop Hypertension (DASH) relate to (a) dietary GHGE and (b) to examine the influence of PHDI food components on dietary GHGE.MethodsWe used life cycle assessment data from the Database of Food Recall Impacts on the Environment for Nutrition and Dietary Studies to calculate the mean dietary GHGE of 8,128 adult participants in the 2015–2016 and 2017–2018 cycles of the National Health and Nutrition Examination Survey (NHANES). Poisson regression was used to estimate the association of (a) quintiles of diet score and (b) standardized dietary index Z-scores with dietary GHGE for PHDI, HEI-2015, and DASH scores. In secondary analyses, we used Poisson regression to assess the influence of individual PHDI component scores on dietary GHGE.ResultsWe found that higher dietary quality on all three indices was correlated with lower dietary GHGE. The magnitude of the dietary quality-dietary GHGE relationship was larger for PHDI [-0.4, 95% CI (-0.5, -0.3) kg CO2 equivalents per one standard deviation change] and for DASH [-0.5, (-0.4, -0.6) kg CO2-equivalents] than for HEI-2015 [-0.2, (-0.2, -0.3) kg CO2-equivalents]. When examining PHDI component scores, we found that diet-related GHGE were driven largely by red and processed meat intake.ConclusionsImproved dietary quality has the potential to lower the emissions impacts of US diets. Future efforts to promote healthy, sustainable diets could apply the recommendations of the established DASH guidelines as well as the new guidance provided by the PHDI to increase their environmental benefits.

BackgroundHealth authorities are increasingly integrating environmental sustainability considerations into food-based dietary guidelines. However, concerns persist about the accuracy of the data used to assess environmental impacts, as well as the extent to which these guidelines are followed in practice. AimTo compare dietary greenhouse gas (GHG) emissions estimates using different top-down and bottom-up life cycle assessment (LCA) databases; and to estimate GHG emissions of food consumption within the ranges set for meat and dairy in recently proposed environmentally sustainable diets. MethodsDietary GHG emissions were estimated for participants in the 2019–2021 Icelandic National Dietary Survey (n = 822) using three publicly available LCA databases from Denmark, the US, and France. GHG emissions among participants whose consumption was aligned with the EAT-Lancet diet, the 2021 Danish food-based dietary guidelines and the 2023 Nordic Nutrition Recommendations were also quantified. ResultsThe mean dietary GHG emissions among participants were 6.3, 6.1, and 6.1 kg CO2-eq/day based on the Danish (top-down), US (bottom-up), and French (bottom-up) databases, respectively. The relative ranking of foods was also consistent across all three databases. For example, the relative contribution of total CO2-eq (% range for the three databases) was highest for red meat (39–51%), followed by dairy (10–17%) and beverages (9–13%). The contribution from plant-based foods (6–10%), seafood (4–11%), and poultry/eggs (<5%) was modest. The dietary habits of most participants (86%) were outside the ranges for meat and dairy consumption as set by the three sustainable diets. However, participants reporting consumption within the ranges for meat and dairy had mean GHG emissions ranging between 4.2 and 4.7 kg CO2-eq/day, depending on the diet. In comparison, the mean for participants not adhering to the sustainable diets was 7.7 kg CO2-eq/day. These results are higher than those reported in other Nordic and European studies, likely due to high consumption of lamb, beef, and dairy, and low consumption of plant-based food. ConclusionAll three LCA databases provided similar estimates for total dietary GHG emissions and relative ranking of different food groups. Based on current dietary habits in Iceland, adherence to environmentally sustainable diets would lead to a substantial reduction in dietary GHG emissions.

ABSTRACTBackgroundA substantial portion of greenhouse gas emissions (GHGE) has been attributed to the food sector, but little is known about the association between the carbon footprint of individual self-selected diets in the United States and nutritional quality.ObjectivesThe aims of this study were to assess the GHGE from individual self-selected diets in the United States and examine their association with nutritional quality of the diets, demographic patterns, and food-related behaviors.MethodsThe dietary GHGE from US adults (>18 y, N = 16,800) in the 2005–2010 National Health and Nutrition Examination Survey (NHANES) were calculated by linking all foods consumed in their 24-h recall diets to our new database of food environmental impacts. Diets were ranked by GHGE/1000 kcal. Those in the top and bottom quintiles were compared on the US Healthy Eating Index (HEI) and on the amounts of specific nutrients known to be under- or overconsumed in the US population. Demographic and behavioral variables from the NHANES were also correlated to these dietary carbon footprints.ResultsDiets in the bottom quintile accounted for one-fifth the total emissions (GHGE/1000 kcal) of those in the top quintile, yet had significantly higher (P < 0.001) HEI scores by 2.3 ± 0.7 points on a 100-point scale. These low-GHGE diets contained higher amounts of fiber and vitamin E and lower amounts of sodium and saturated fats, whereas high-GHGE diets contained higher amounts of vitamins A and D, choline, calcium, iron, and potassium. Low-GHGE diets had less meat, dairy, and solid fats, and more poultry, plant protein foods, oils, whole and refined grains, and added sugars.ConclusionsFood patterns responsible for lower GHGE had a better overall diet quality and were more nutritious on several key dimensions, although not all. These results can inform dietary guidance and other policies that seek to address the goals of improved dietary intakes and reduced food-related emissions.

BackgroundThe typical Western diet is associated with high levels of greenhouse gas (GHG) emissions and with obesity and other diet-related diseases. This study aims to determine the impact of adjustments to the current diet at specific moments of food consumption, to lower GHG emissions and improve diet quality.MethodsFood consumption in the Netherlands was assessed by two non-consecutive 24-h recalls for adults aged 19–69 years (n = 2102). GHG emission of food consumption was evaluated with the use of life cycle assessments. The population was stratified by gender and according to tertiles of dietary GHG emission. Scenarios were developed to lower GHG emissions of people in the highest tertile of dietary GHG emission; 1) reducing red and processed meat consumed during dinner by 50% and 75%, 2) replacing 50% and 100% of alcoholic and soft drinks (including fruit and vegetable juice and mineral water) by tap water, 3) replacing cheese consumed in between meals by plant-based alternatives and 4) two combinations of these scenarios. Effects on GHG emission as well as nutrient content of the diet were assessed.ResultsThe mean habitual daily dietary GHG emission in the highest tertile of dietary GHG emission was 6.7 kg CO2-equivalents for men and 5.1 kg CO2-equivalents for women. The scenarios with reduced meat consumption and/or replacement of all alcoholic and soft drinks were most successful in reducing dietary GHG emissions (ranging from − 15% to − 34%) and also reduced saturated fatty acid intake and/or sugar intake. Both types of scenarios lead to reduced energy and iron intakes. Protein intake remained adequate.ConclusionsReducing the consumption of red and processed meat during dinner and of soft and alcoholic drinks throughout the day leads to significantly lower dietary GHG emissions of people in the Netherlands in the highest tertile of dietary GHG emissions, while also having health benefits. For subgroups of the population not meeting energy or iron requirements as a result of these dietary changes, low GHG emission and nutritious replacement foods might be needed in order to meet energy and iron requirements.

The production of animal-based foods is associated with higher greenhouse gas (GHG) emissions than plant-based foods. The objective of this study was to estimate the difference in dietary GHG emissions between self-selected meat-eaters, fish-eaters, vegetarians and vegans in the UK. Subjects were participants in the EPIC-Oxford cohort study. The diets of 2,041 vegans, 15,751 vegetarians, 8,123 fish-eaters and 29,589 meat-eaters aged 20–79 were assessed using a validated food frequency questionnaire. Comparable GHG emissions parameters were developed for the underlying food codes using a dataset of GHG emissions for 94 food commodities in the UK, with a weighting for the global warming potential of each component gas. The average GHG emissions associated with a standard 2,000 kcal diet were estimated for all subjects. ANOVA was used to estimate average dietary GHG emissions by diet group adjusted for sex and age. The age-and-sex-adjusted mean (95 % confidence interval) GHG emissions in kilograms of carbon dioxide equivalents per day (kgCO2e/day) were 7.19 (7.16, 7.22) for high meat-eaters ( > = 100 g/d), 5.63 (5.61, 5.65) for medium meat-eaters (50-99 g/d), 4.67 (4.65, 4.70) for low meat-eaters ( < 50 g/d), 3.91 (3.88, 3.94) for fish-eaters, 3.81 (3.79, 3.83) for vegetarians and 2.89 (2.83, 2.94) for vegans. In conclusion, dietary GHG emissions in self-selected meat-eaters are approximately twice as high as those in vegans. It is likely that reductions in meat consumption would lead to reductions in dietary GHG emissions.

Considering the adverse effects of agricultural-food systems on both human health and the environment, this research aimed to identify sustainable diets, which are nutritious, culturally acceptable, affordable, and have low environmental impacts, based on self-reported diets in China. Dietary data was collected with a 3-day 24-h dietary recall and weight food record combined method among 10,324 subjects aged 18–64 year, who participated in the China Health Nutrition Survey 2011. Diet quality was assessed by the Chinese Healthy Eating Index 2016 (CHEI2016). Environmental impact was measured by greenhouse gas emissions (GHGE), total water use (TWU), and land use (LU), and diet costs were calculated using market prices of community surveys. Reduced rank regression derived dietary patterns with 34 food groups as predictor variables, and used CHEI2016 score, dietary greenhouse gas emissions (GHGE), total water use (TWU), land use (LU), and cost of the diet as response variables. Four dietary patterns were identified. Participants with the highest adherence (decile 10) to the “High animal-based food” pattern showed higher dietary GHGE (+57%), TWU (+51%), and LU (+54%) and dietary costs (+64%), compared to the average population's diets. The diet in decile 10 for the “High fruit, low ruminant meat” pattern displayed a 21% higher CHEI2016 score, and higher dietary environmental impact (GHGE +17%; TWU +22%; LU +19%) and dietary costs (+46%) than the average diets. Diets of participants who followed the “High fish, low beverages” pattern showed higher environmental impact (GHGE +39%; TWU +32%; LU +28%) and dietary costs (+19%), but the CHEI2016 score was similar (+0.1%). Finally, the “High wheat, low pork” pattern demonstrated lower environmental impacts (GHGE -17%, TWU -12%, LU -2%) and lower cost of the diet (−2%) but also lower CHEI2016 score (−1%) compared to average population. This study reveals the complex trade-offs between diet quality, environmental sustainability, and dietary costs of current dietary patterns. None of the four patterns achieved the desirable combination of high CHEI2016 scores, reduced environmental impact, and reduced dietary costs. The findings offer insights into sustainable diet choices within the current food system, suggesting dietary guidelines should consider environmental sustainability and cost-effectiveness.

Plant-rich diets have gained recognition for their environmental sustainability. However, relatively few studies have compared dietary habits of vegans and omnivores in terms of compliance with nutritional recommendations and dietary greenhouse gas (GHG) emissions, which this study aimed to assess. We used data on 651 omnivores and 68 vegans from the Icelandic National Dietary Survey (2019–2021) and a comparable survey on vegans (2022–2023), respectively. The median dietary GHG emissions was substantially lower among vegans than omnivores (2.6 vs. 5.3 kg CO2-eq/day). Compared to omnivores, vegans had a proportionally higher intake of energy from carbohydrates (48% vs. 39%) but a lower intake from fat (35% vs. 40%) and proteins (12% vs. 18%). More vegans compared to omnivores fell within the dietary recommendations for fiber (74% vs. 8%) and saturated fat (56% vs. 7%) while vegans were less likely to have protein intake in line with the recommended ≥ 0.83 g/kg body weight (52% vs. 79%). Despite frequent use of dietary food supplements among vegans (97%) and omnivores (72%) the prevalence of those reaching the recommended intake of iodine, calcium and vitamin D, was low (40–60%) in both groups. In conclusion, vegans were overall more compliant with macronutrient recommendations and had substantially lower dietary GHG emissions compared to omnivores. In terms of meeting dietary recommendations, room for improvements was observed in both groups.

Introduction : Food consumption accounts for 20-30% of greenhouse gas emissions in the EU. Certain foods have higher emissions than others and are often the target of policy makers to reduce greenhouse gasses associated with food consumption. However, food policy should aim to address both climatic and health imbalances concurrently and hence have more significant impact. Targeting excessive food consumption as a mitigation strategy for greenhouse gas emissions may also have a concurrent impact on the global obesity epidemic Objective: To evaluate the greenhouse gas emissions (GHGE) associated with the excessive food and energy intake in Irish adults. Methods: A secondary analysis of nationally representative data from the National Adult Food & Nutrition Survey, 2011, was conducted. The demographic characteristics, food consumption patterns and diet-associated GHGEs were compared across categories of increasing levels of relative energy intake. One-way ANOVA (p<0.05) was used to determine the level of significance across quintiles of relative energy intake. Results: Different dietary patterns were evident between the categories of varying relative energy intake. A strong positive correlation (r = 0.736; p< 0.001) was evident between dietary GHGE and the EI relative to one’s requirements. In Irish diets, animal products contributed to a large proportion of total dietary GHGE but accounted for much less of overall EI. Plant-based foods were the lowest contributors to total GHGE. When constructing strategies to mitigate dietary carbon emissions, it is important to carefully consider all aspects of sustainability. The exclusion of certain food groups from the average diet may provoke health, economical and/or cultural repercussions. An adherence to the Irish dietary guidelines, including a decrease of EI, can viably attenuate dietary environmental impact Conclusions: The results offer further evidence to support the hypothesis that excessive energy consumption and the overconsumption of certain food types are detrimental to overall diet-associated carbon emissions levels, and that adhering to the current Irish dietary guidelines can potentially lower dietary related GHGE.

Application of the Automated Self-Administered 24-Hour (ASA24) Dietary Assessment Tool’s New Carbon Footprint Dataset

Evidence from the scientific literature shows a significant variation in greenhouse gas (GHG) emissions from the diet, according to the type of food consumed. We aim to analyze the relationship between the daily dietary GHG emissions according to red meat, fruit and vegetables consumption and their relationship with risk of total mortality, and incident risk of chronic diseases. We examined data on the EPIC-Spain prospective study, with a sample of 40621 participants. Dietary GHG emission values were calculated for 57 food items of the EPIC study using mean emission data from a systematic review of 369 published studies. Dietary GHG emissions (kgCO2eq/day), per 2000kcal, were 4.7 times higher in those with high red-meat consumption (>140g/day) than those with low consumption (<70g/day). The average dietary GHG emissions were similar in males and females, but it was significantly higher in youngest people and in those individuals with lower educational level, as well as for northern EPIC centers of Spain. We found a significant association with the risk of mortality comparing the third vs. the first tertile of dietary GHG emissions [hazard ratio (HR) 1.095; 95% confidence interval (CI) 1.007-1.19; trend test 0.037]. Risk of coronary heart disease (HR 1.26; 95% CI 1.08-1.48; trend test 0.003) and risk of type 2 diabetes (HR 1.24; 95% CI 1.11-1.38; trend test 0.002) showed significant association as well. Decreasing red-meat consumption would lead to reduce GHG emissions from diet and would reduce risk of mortality, coronary heart disease and type 2 diabetes.

Diets have been changing drastically in China in the recent decades and this change has contributed considerably to greenhouse gas (GHG) emissions. In determining effective mitigation strategies for future emissions, it is necessary to know how emissions related to diet vary over time in overall magnitude and due to compositional changes driven by socioeconomic dynamics. This study evaluates the change in dietary GHG emissions in China during the 1997–2011 period by linking environmentally extended input–output tables with individual daily food intake data. It further decomposes the contribution to GHG emission changes of various socioeconomic driving factors. The results show that GHG emissions related to national diet have been decreasing from 1,180 Mt CO 2 e to 640 Mt CO 2 e (a 54% decline), largely due to technical innovation that has reduced the emissions per calorie of food (135% of the total reduction). The change in dietary patterns has had mixed effects, with a decline in calorie intake reducing emissions by 21% while increases in animal‐sourced food consumption have raised emissions by 25%. Our findings stress the importance of technical progress in the historical change in dietary GHG emissions and suggest a focus on behavior changes for future research and policymaking, which has the potential to promote dietary changes toward less animal product consumption. Our findings highlight the importance of both technological and demand‐side behavioral options in reducing the impact of diets on GHG emissions.

Ten years of corporate action on climate change: What do we have to show for it?

This study examines the carbon emission reduction goals of third-party logistics (3PL) firms for sustainable activities, assessing their effectiveness and impact on sustainability. It explores the goals and methods used by these companies, their implementation challenges, and the potential effects on sustainability outcomes like reduced emissions, improved operational efficiency, and increased stakeholder participation. This aims to understand how 3PL companies reduce their carbon footprints and identify opportunities. This study examines the leading 3PL providers in the global content market using a comprehensive analysis of literature articles. The effect of carbon footprints on efficiency in third-party logistics companies is examined in the present research. With an emphasis on carbon mitigation, the effects of carbon footprints on organisations, and the tactics 3PL entities employ to lower their carbon footprints, it included 76 research publications during 2019–2024. The study examines supply chain management, sustainability, and emission reduction using the theories of carbon management, stakeholders, and the environment. The outcomes demonstrate how well the retention of carbon techniques works to raise industrial sustainability standards. This study evaluates the interest and difficulties experienced by 3PL companies by comparing the results with those of other countries. Consequently, the goal of the research is to raise the general understanding of environmental issues and accomplish long-term sustainability objectives in the transportation industry, as a finding of this research, Direct, indirect, and fugitive carbon footprints have considerable impacts on the environment and economy. Compared to individuals, businesses are more responsible for global warming, which damages infrastructure, disrupts supply chains, and lowers productivity. 3PL companies can employ carbon mitigation strategies, such as waste reduction, renewable energy investments, and environmentally friendly transportation while interacting with stakeholders and governments to minimise the negative environmental effects. Likewise,20% of the world's greenhouse gas (GHG) emissions come from the transportation sector, which includes 3PL companies. Keywords: Carbon Footprint, GHG Emissions, Supply Chain Management, Sustainability, Sustainable Practices, Third-Party Logistics

Introduction and overview COP21 (1) is the latest in the annual Conference of Parties, which began in Berlin in 1995, with a main aim to review the implementation of the Convention--the UN Framework Convention on Climate Change (2) (UNFCCC)--which entered into force on the 21 March 1994. The UNFCCC was adopted at the Rio de Janeiro Earth Summit of 1992, and sets out an overall framework intended to stabilise atmospheric concentrations of greenhouse gases (GFIGs) so to prevent dangerous anthropogenic interference with the climate system. The UNFCCC membership is now practically universal and, as of December 2015, consists of 197 parties. Some of the more significant conferences (and their associated actions) include COP3 (Kyoto Protocol adopted), COP 11 (Montreal Action Plan agreed), COP 15 in Copenhagen (agreement not achieved to implement the Kyoto Protocol) and COP 17 in Durban (Green Climate Fund agreed). COP21 stands out from all previous conferences (1), in that it aimed to limit the rise in global temperatures to well below 2 [degrees]C above pre-industrial levels (with the background target being 1.5 [degrees]C), by establishing a universal agreement on climate, among all the nations of the world, that is legally binding. The negotiations at COP21 led to the Paris Agreement3 being adopted on 12 December 2015, which governs measures for climate change reduction from 2020, and concluded the work of the Durban platform, which was set out as part of the activities of COP 17. However, it is required (3) that 55 countries which produce at least 55% of the world's greenhouse gas emissions (Figure 1) ratify the Agreement, in order for it to enter into force and become fully binding. The Agreement must be signed in New York between 22 April 2016 and 21 April 2017, by these parties, who must also assimilate it, as appropriate, within their own legal systems, via ratification, acceptance, approval, or accession. However, it is speculated that some parties, particularly the United States, may not agree to do so. Indeed, although it is a requirement that each country that ratifies the agreement must set a target for its reduction in emissions, there is no compulsory amount for this (4). Moreover, there is to be no means to compel the setting of a target by a specific date nor penalty measures imposed should a set target not be met (4) (in contrast with the more specific and draconian Kyoto Protocol). Any noncompliant countries will merely be named and shamed, which has contributed to severe criticism of the whole enterprise, e.g. by such eminent figures as James Hansen, who is quoted (5) as saying: [FIGURE 1 OMITTED] a fraud really, a fake. just bullshit for them to say: 'We'll have a 2 [degrees]C warming target and then try to do a little better every five years.' It's just worthless words. There is no action, just promises. As long as fossil fuels appear to be the cheapest fuels out there, they will be continued to be burned. At COP21, particular focus has been given to two primary issues: namely, whether the critical temperature limit should be set at 1.5 [degrees]C or 2 [degrees]C above preindustrial levels; and the appropriate level of funding that should be awarded by developed nations to developing countries that are potentially vulnerable to sea-level rise, and to expectedly more severe weather events (5). In Hansen's view, all of this carries little weight without taxes for greenhouse gas emissions being imposed equally and globally, being of the belief that this is the only strategy that can drive reductions in greenhouse gas emissions at the relatively rapid rate that is necessary to mitigate the worst possible scenarios of climate change (5). However, the United States Secretary of State, John Kerry has opposed Hansen's criticisms of COP21, and is adamant that the deal will auger in a global replacement of fossil fuels by renewable energy sources (6). …

Dietary greenhouse gas emissions and the risk of coronary heart disease and type 2 diabetes