The trendy regimens are are high in carbon footprint and low in nutrients.
Our food choices can have major consequences: What we eat contributes aboutof all greenhouse gas emissions globally, when accounting for agriculture and land use, supply chain, and our dietary habits. Given food’s huge impact on climate change, it’s important that dietary patterns become more sustainable. This begins with identifying the food choices that are environmentally friendly, which is exactly what the study sought to find out.
“Given that many people are experimenting with different diets, it’s helpful to have a sense of the differences in their impacts,” says Diego Rose, study author and director of nutrition at Tulane University. “What individuals choose to eat sends signals to producers about what to produce, so individual behaviors can affect what gets produced and thus the impacts from our overall food production.
The findings showed that Paleo and keto are among the highest in carbon emissions and lowest in nutrition quality. The researchers estimated these diets produce about 2.6 and almost 3 kilograms of carbon dioxide for every 1,000 calories consumed, respectively. Meanwhile, a vegan diet was the best for the environment, which generates about 0.7 kg of carbon dioxide for the same number of calories.
A vegetarian diet produces the second lowest emissions at 1.16 kilograms of carbon dioxide for every 1,000 calories consumed, the study authors found. Pescatarian and omnivore diets fared in the middle, generating about 1.66 and 2.23 kilograms of carbon dioxide for the same number of calories, respectively.
The scientists reviewed the diets of more than 16,000 adults, collected by the National Center for Health Statistics’ nationally representative National Health and Nutrition Examination Survey. Rose and his co-authors’ also created their own database of environmental impacts of food commodities, which they linked to the national dataset to calculate the impact of each food item consumed. This allowed the authors to compute an average carbon footprint for each diet type.
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