Planetary Health Diet Explained: The EAT-Lancet Commission’s Recommendations

Study in one sentence

The EAT-Lancet Commission’s report, “Food in the Anthropocene,” proposes a universal healthy reference diet, termed the planetary health diet, that aims to optimize human health while keeping food production within planetary boundaries to sustainably feed a global population of 10 billion people by 2050.

Publication and date

The report was published in The Lancet on January 16, 2019, as “Food in the Anthropocene: the EAT–Lancet Commission on healthy diets from sustainable food systems.” The commission comprised 37 leading scientists from 16 countries, led by Prof. Walter Willett (Harvard T.H. Chan School of Public Health) and Prof. Johan Rockström (Stockholm Resilience Centre). It is a peer-reviewed scientific report.

Research question

The commission set out to answer: Can we feed a future population of 10 billion people a healthy diet within the planet’s environmental boundaries? Specifically, they aimed to define a universal healthy reference diet that meets nutritional requirements, reduces the risk of non-communicable diseases, and keeps food production within planetary boundaries for climate change, biodiversity loss, land use, freshwater use, and nutrient pollution.

Method

The EAT-Lancet Commission used a comprehensive modeling approach. They reviewed the scientific literature on healthy diets and sustainable food systems, then developed a global reference diet using an optimization model. The model balanced nutritional adequacy (based on WHO and other dietary guidelines) with environmental constraints derived from the planetary boundaries framework. The diet was designed to provide 2,500 kcal per day, with food group ranges that allow for cultural and regional adaptation. The environmental targets included greenhouse gas emissions, cropland use, water use, nitrogen and phosphorus application, and biodiversity loss. The commission also modeled the potential health impacts of shifting from current diets to the reference diet, estimating changes in mortality from diet-related diseases.

Main findings

The commission proposed a “planetary health plate” consisting of approximately half a plate of vegetables and fruits, and the other half primarily of whole grains, plant protein sources (beans, lentils, pulses, nuts), unsaturated plant oils, and modest amounts of animal protein. Key dietary targets include:

• Vegetables (300g/day) and fruits (200g/day)
• Whole grains (232g/day) and tubers/starchy vegetables (50g/day)
• Protein sources: primarily from plants, with optional modest amounts of animal protein (e.g., 28g/day of fish, 28g/day of poultry, 14g/day of red meat, 28g/day of eggs)
• Dairy foods limited to 250g/day (one glass of milk or equivalent)
• Added sugars limited to 31g/day (about 8 teaspoons)
• Unsaturated plant oils (40g/day) and limited saturated fats

The report estimated that adopting this diet could prevent approximately 11 million premature adult deaths per year, a reduction of 19–24% in total mortality. Environmentally, it would keep food production within planetary boundaries, reducing greenhouse gas emissions by up to 56% and land use by up to 30% compared to current trajectories. The diet is flexible and can be adapted to local food cultures and individual preferences.

What the findings do not prove

The report does not prove that the planetary health diet is the only way to achieve healthy and sustainable food systems. It is a modeling exercise based on current scientific understanding, and the health and environmental outcomes are projections, not certainties. The diet is not a prescription for individuals but a global reference framework. It does not account for all possible variations in local food systems, cultural practices, or individual nutritional needs. The mortality reduction estimates are based on population-level modeling and do not guarantee individual health outcomes.

Limitations

The commission acknowledged several limitations. The dietary targets are based on observational studies and randomized trials, which have inherent biases and cannot fully establish causality. The environmental targets rely on planetary boundary estimates that are subject to uncertainty. The modeling did not fully account for regional differences in food production impacts, trade dynamics, or socioeconomic barriers to dietary change. The reference diet may not meet all micronutrient needs for all populations, particularly for iron, zinc, calcium, and vitamin B12, without careful planning or supplementation. The report did not address the political and economic feasibility of implementing such a global dietary shift.

How it compares with previous research

The EAT-Lancet report built on a large body of previous research linking diet to health and environmental outcomes. Earlier studies, such as those by Tilman and Clark (2014) and Springmann et al. (2016), had shown that shifting toward plant-based diets could reduce environmental impacts and improve health. The EAT-Lancet Commission integrated these findings into a single, comprehensive framework that combined health and environmental targets for the first time. It also provided specific, quantitative dietary recommendations, whereas previous work often focused on broader dietary patterns (e.g., Mediterranean, vegetarian). The report’s emphasis on both human health and planetary boundaries was novel and sparked global discussion.

Why it matters

The EAT-Lancet report matters because it provides a science-based, integrated vision for transforming the global food system to address the dual challenges of malnutrition and environmental degradation. It offers a concrete dietary target that can guide policy, industry, and individual choices. The report has influenced international dietary guidelines, corporate sustainability strategies, and public discourse on sustainable eating. It highlights the urgency of shifting toward more plant-based diets to meet climate goals and improve public health, making it a landmark publication in the field of food systems.

Link to the primary paper

The full report is available at: https://doi.org/10.1016/S0140-6736(18)31788-4. Citation: Willett, W., Rockström, J., Loken, B., et al. (2019). Food in the Anthropocene: the EAT–Lancet Commission on healthy diets from sustainable food systems. The Lancet, 393(10170), 447–492.