Eating less meat and dairy does not have to mean overhauling the dinner table or spending more at the grocery store.
A new modeling study published in Nature Food suggests that modest, realistic changes, such as replacing some meat in everyday meals with vegetables, beans or eggs, could support better health and nutrition without raising overall food costs.
The study, led by researchers at the University of Edinburgh with collaborators from the University of Oxford and Food Standards Scotland, analyzed 33 possible ways Scottish adults could reduce meat and dairy intake in line with U.K. climate recommendations. The researchers modeled how those changes might affect 54 nutrients, diet costs, greenhouse gas emissions, land and water use, obesity, type 2 diabetes, cardiovascular disease and all-cause mortality.
Because this was a computational modeling study, it does not prove that any single food swap will prevent disease or improve health for an individual person. Instead, it estimates what could happen across a population if common dietary patterns shifted in specific ways.
The findings point to a practical middle ground in a nutrition conversation that often swings between all-or-nothing advice. Across nearly all modeled scenarios, reducing meat and dairy was linked with improvements in most nutrition, health and environmental outcomes without increasing diet costs.
The benefits were greatest when the changes focused on people who ate the most red and processed meat, rather than asking everyone to reduce by the same amount. In one modeled scenario, helping high consumers of red meat move toward lower intakes was estimated to prevent nearly 60,000 cases of type 2 diabetes over 10 years in Scotland while also producing larger environmental gains.
The replacement foods mattered, too. The study found that gram-for-gram swaps using foods such as vegetables, beans, eggs and plant-based dairy alternatives were among the pathways associated with better outcomes.
That kind of change could look less like a strict diet and more like adjusting familiar meals. A pasta dish might use less meat and more vegetables or beans. A sandwich might include egg or a bean-based spread in place of some processed meat. A few meals each week might lean more heavily on plant-based proteins without requiring someone to give up meat altogether.
“The findings show that modest, realistic dietary changes, when scaled across a population, can deliver substantial benefits to people and the planet,” said Dr. Joe Kennedy, from the University of Edinburgh’s Division of Global Agriculture and Food Systems. “Making healthier, sustainable options more available and convenient will be key to enabling such change.”
The study also challenges the assumption that more sustainable eating is automatically more expensive. Most of the modeled diet changes had little effect on overall food costs, which is important because nutrition advice is not very useful if it only works for people with more time, money or access to specialty foods.
The findings do come with important limits. The model was based on adults in Scotland, so the cost estimates may not translate neatly to U.S. grocery stores or American eating patterns. The researchers also modeled long-term health outcomes using existing evidence on diet and disease risk, rather than following people who made these changes over time.
There was also one nutrient concern: iodine. In the model, lower dairy intake could substantially reduce iodine intake for some groups. The researchers noted that fortifying plant-based dairy alternatives with iodine could help address that risk, but not all products are fortified the same way.
That caveat matters. The study does not show that people need to eliminate meat or dairy, or that every plant-based swap is nutritionally equal. It does suggest that smaller, more targeted changes may offer a practical path for people who want to eat in a way that supports health, fits their budget and lowers the environmental footprint of their meals.
This research was funded by Food Standards Scotland, the Wellcome Trust and UKRI. One author was funded by the Medical Research Council/UK Research and Innovation. Food Standards Scotland was involved in the study design, writing of the manuscript and decision to submit the manuscript for publication.