"Our calculations show that even moderate amounts of red meat in one's diet are incompatible with what the planet can regenerate of resources based on the environmental factors we looked at in the study. However, there are many other diets - including ones with meat - that are both healthy and sustainable," she says.

The researchers' first goal was to investigate whether it is even possible to fulfil the nutritional needs of the entire global population without exceeding planetary boundaries. According to the calculations, it is possible. But it will require a change in our food consumption on both a global and individual level, says Caroline H. Gebara.
"The global shift requires political action at the top level, while the individual shift will be much easier if we have better guidance and frameworks that support sustainable choices," she says.
The next goal of the research was therefore to come up with concrete figures for how much of different foods you can eat without consuming more of the earth's resources than it can regenerate, says Caroline H. Gebara.
"Most people now realise that we should eat less meat for both environmental and health reasons. But it's hard to relate to how much ‘less’ is and whether it really makes a difference in the big picture. Therefore, based on the planetary boundaries, we have calculated a concrete figure - 255 grams of poultry or pork per week - which you can actually visualise and consider when you are standing in the supermarket," she says.
In Danish supermarkets, a pack of two chicken breast fillets typically weighs 280 grams which is slightly over the limit of what one person can eat in a week without exceeding the planetary boundaries.
This content is taken from Technical University of Denmark

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"A sustainable diet leaves room for two chicken breasts a week", MachPrinciple, June 28, 2025, https://machprinciple.com/post/A-sustainable-diet-leaves-room-for-two-chicken-breasts-a-week