Planetary health diet

The planetary health diet (PHD), also called the EAT-Lancet diet, Lancet diet, planetary diet, or planetarian diet, is a diet created by the EAT-Lancet commission as part of a report released in The Lancet on 16 January 2019. The diet is designed to be healthy, adaptable to diverse cultures, and environmentally sustainable for a world population of up to 10 billion people. The PHD is a flexitarian diet consisting largely of plant-based foods: vegetables, fruits, whole grains, legumes, nuts, and unsaturated oils. It includes moderate amounts of fish and shellfish, poultry, dairy, and eggs. Red meat (beef, lamb, and pork) is included in small quantities. Processed meat, highly processed foods, added sugars, refined grains, and starchy vegetables are minimized. Since poor diets are a major cause of health problems and death, the report estimated that universal adoption of the PHD would prevent 11 million deaths per year, largely by preventing coronary heart disease, stroke, type-2 diabetes, some cancers, and other diseases. In high-income countries the PHD is generally affordable and studies indicate that it does not need to cost more than typical diets for those countries. However, it has been estimated that at least 1.58 billion people in low- and middle-income countries would not be able to afford the PHD. The PHD was largely well-received by the academic community. In social media discussion and in the media, responses to the report were highly polarised and the report became framed as a culture war issue. Evidence later emerged that a public relations firm working with the Animal Agricultural Alliance had organised a backlash against the PHD.

Definition, composition The PHD is largely a plant-based diet consisting of vegetables, fruits, whole grains, legumes, nuts, and unsaturated oils (olive, soybean, canola, sunflower, and peanut oil). It optionally includes moderate amounts of fish and shellfish, poultry, dairy products, and eggs. Red meat (beef, lamb, and pork) can be included in small quantities, which is why it is called flexitarian. Processed meat, highly processed foods, added sugars, refined grains, and starchy vegetables such as potatoes are minimized. Globally, the report calls for a more than 50% reduction in "unhealthy foods, such as red meat and sugar." Red meat is associated with higher risk of cardiovascular disease, diabetes, and some cancers. Global adoption of the diet would entail more than doubling the global consumption of nuts, fruits, vegetables, and legumes. A 2020 comparison study found agreements between the planetary diet and the 2015-2020 Dietary Guidelines for Americans. The differences are in the recommended amounts of fruit, nuts, red meat, seeds, starchy vegetables and whole grains. As of 2023 several studies have proposed variations of the PHD that are adapted to different cultures and regions. For instance, a variation of the PHD has been created for Denmark and a different one for Italy. In 2024, lower-calorie versions of the diet have also been created for those who are trying to lose weight.

History The EAT-Lancet Commission was an independent scientific body consisting of 19 commissioners and 18 co-authors. Commission members came from 16 countries, working in the fields of health, agriculture, political science, and environmental science. The commission was tasked with using the best available evidence to determine a universal reference diet that is healthy for both humans and the planet, minimising chronic disease risks and maximising human wellbeing. The diet is intended for individuals aged 2 years and above who are generally healthy, and is designed to be adaptable for all regions and culinary traditions of the world. Combined with improved agricultural production practices and a 50% reduction in food waste and loss, the Commission estimated that this diet would provide healthy nutrition to 10 billion people, the projected population of the Earth in 2050, and be environmentally sustainable. The report assessed environmental sustainability using the planetary boundaries framework, considering the effects of the food system on climate change, land systems change, freshwater use, biodiversity loss, and nitrogen and phosphorus cycling. The global food system is responsible for 25% to 30% of greenhouse gas emissions. Agriculture takes up 70% of global freshwater use and half of the world's habitable land surface.

Health effects The EAT-Lancet report estimated that if the PHD were universally adopted, 11.1 million deaths per year would be prevented. This would be accomplished largely by preventing coronary heart disease, stroke, type-2 diabetes, some cancers, and other diseases. The PHD would also reduce rates of child stunting, which is common in low-income countries. A 2024 review of 28 studies found that the PHD was significantly associated with lower rates of diabetes, cardiovascular disease, cancer and all-cause mortality. Some studies found that a PHD could be deficient in certain micronutrients. Vitamin and mineral supplements are not explicitly part of the PHD, but the report indicates they can sometimes be necessary. For instance, the report recommends iron supplements for adolescent girls who do not eat meat. A 2025 meta-analysis found that higher adherence to the PHD was associated with lower all-cause mortality and a reduced cancer risk in participants from NHANES and UK Biobank.

Present dietary situation Poor diets are a major cause of health problems and death, due to both inadequate consumption of nutritious foods and excess consumption of harmful ones. Globally, approximately 800 million people are undernourished, around 2 billion adults are overweight or obese, and over 2 billion people have micronutrient deficiencies.

Cost

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