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The planetary health diet, also called a planetary diet or planetarian diet, is a flexitarian diet created by the EAT-Lancet commission^[1]^[2] as part of a report released in The Lancet on 16 January 2019.^[3] The aim of the report and the diet it developed is to create dietary paradigms that have the following aims:^[2]

To feed a world population of 10 billion people in 2050
To greatly reduce the worldwide number of deaths caused by poor diet
To be environmentally sustainable as to prevent the collapse of the natural world

Restrictions

To achieve this, it has defined heavy restrictions on the consumption of meat, dairy, and starchy vegetables, specifically red meat. The aims of this are:

to lessen the impact of the meat and dairy industries on the environment,
theoretically, to drastically decrease saturated fat and sugar intake from these food groups.^[2] Today's consumption of meat and dairy often exceeds nutritional recommendations.^[4]

Healthy diets have an optimal caloric intake and consist largely of a diversity of plant-based foods, and small amounts of animal source foods. They contain unsaturated rather than saturated fats, and limited amounts of refined grains, highly processed foods and added sugars.

Scientific targets for a planetary health diet, with possible ranges, for an intake of 2500 kcal/day.
Food	Macronutrient intake (grams per day) (possible range)	Caloric intake (kcal per day)	Example	Comparison
Vegetables	300 (200–600)	78
Dairy foods	250 (0–500)	153	One cup of milk per day
Whole grains	232	811
Fruits	200 (100–300)	126
Tubers or Starchy vegetables	50 (0–100)	39	Two medium-sized potatoes or servings of cassava per week
Unsaturated oils	40 (20–80)	354
Added sugars	31	120	Two tablespoons of honey per day
Saturated oils	11.8 (0–11.8)	96
Protein sources:
Legumes	75 (0–100)	284
Nuts	50 (0–75)	291
Chicken and other poultry	29	62	One boneless, skinless chicken thigh every other day or one slice of chicken lunch meat per day
Fish	28	40
Beef, lamb and pork	14	30	One strip of bacon every other day or one medium-size hamburger per week	Twice the average per capita consumption in Asia, and the average amount of red meat eaten in Africa^[5]
Eggs	13	19	One egg every third day (e.g., poached, made into pancakes, etc.)	Half the egg consumption in Japan and China;^[6] six times the egg consumption in India^[7]

There are also other restrictions on the amounts of fruit, vegetables, legumes, grains, and oil. This is because the diet is created around a total intake of 2,500 calories a day (to discourage overeating). But the main focus is on greatly reducing meat, eggs, dairy, and starchy vegetables. The EAT-Lancet Commission describes the planetary health diet as a "flexitarian diet, which is largely plant-based but can optionally include modest amounts of fish, meat and dairy foods."^[2]

Response

The UK newspaper The Guardian^[8] and US news outlet CNN^[9] have given the diet positive coverage.

Harry Harris, writing in New Statesman, was wary of claims that the diet could transform the world's food system, saying, “It seems churlish to keep placing the onus for climate change onto individual's [sic] behaviour, when we know that 100 companies are responsible for 71 per cent of global emissions."^[10]

The World Health Organization withdrew its sponsorship of the EAT-Lancet event following criticism from Gian Lorenzo Cornado, Italy's representative to the Geneva international organizations. Cornado said that adopting one dietary approach for the whole planet would destroy traditional diets and cultural heritage, and that reducing meat and candy consumption would cause the loss of millions of jobs.^[5]

In 2019, Francisco J. Zagmutt and colleagues challenged the planetary diet based on flaws in the methodology used for health estimates.^[11] However, as pointed out by Walter Willett, the three different methods that were used to estimate the number of preventable deaths among adults were published independently of the EAT-Lancet Commission with a detailed methodology.^[12]

Cost

The cost of this diet is less than what some people spend now, and more than what other people can afford.

The planetary diet was challenged by Adegbola T. Adesogan and colleagues in 2020 who wrote that sustainability-oriented diet plans, such as the planetary diet, do not solve the problems of the women and children who are currently too poor to regularly eat meat, eggs, and dairy products, and whose health would benefit from introducing animal-source foods.^[13]

Researchers from the International Food Policy Research Institute and Tufts University calculated that nearly 1.6 billion people, mostly located in sub-Saharan Africa and South Asia, could not afford the cost of the EAT-Lancet reference diet.^[14]^[15]

A 2020 study found that the planetary diet is more affordable than the typical Australian diet.^[16]

Comparison with recommended diet patterns

A 2020 comparison study found that there are 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.^[17]

A 2020 comparison study of the average Indian diet with the planetary diet found that the average Indian diet is considered unhealthy because of excessive consumption of cereals and processed foods with not enough protein, fruits, and vegetables.^[18]^[19]