Plant-based defaults are one of the most effective tools in behavioral science — and one of the simplest. Instead of asking people to change what they eat, we change what gets served. The result? More plant-forward meals, less friction, and no one loses a choice they cared about.
A default is the option someone gets if they don’t actively choose otherwise. Defaults are everywhere — your phone’s ringtone, your retirement savings plan, the side dish that comes with your entrée. We encounter them constantly without noticing.
In food service, a plant-based default means the plant-based dish is what’s served unless a diner requests something else. It’s not a restriction — it’s a redesign. And it works because most people, most of the time, go with the flow.
This approach draws on decades of behavioral economics research, most notably the work of Richard Thaler and Cass Sunstein in their landmark book Nudge, and Cass Sunstein serves on BFF’s Board of Advisors. We apply these principles specifically to food service settings, where the stakes for the climate, animals, and human health are enormous.
Plant-Based Defaults is the first and most powerful of BFF’s five evidence-based nudge strategies. Each one is a different way to make plant-forward food the easier, more visible, more appealing choice:
1. Plant-Based Defaults — Make the plant-forward option the automatic choice. Meat available on request.
2. Climate-Friendly Ratios — Increase the proportion of plant-based to meat options on the menu. More variety in plant-forward options means more plant-forward choices.
3. Prime Placement — Put plant-forward options first, at eye level, or at the front of the line. Position drives selection.
4. Subtle Substitutions — Replace animal-based ingredients with plant-based ones in existing dishes — often without diners noticing a difference.
5. Tasty Titles & Descriptions — Rename and redescribe plant-forward dishes to be more appealing, craveable, and culturally familiar. “Smoky Black Bean Bowl” outperforms “Vegetarian Option.”
The evidence is clear — plant-based defaults work, and they work at scale.
In the first-ever multi-site study on plant-based defaults in university dining halls — conducted at Tulane, Lehigh, and RPI in collaboration with Sodexo, Food for Climate League, and Boston College researchers — plant-based defaults increased uptake of plant-forward meals from 26.9% to 57.6%, with no reduction in diner satisfaction or operational feasibility.
At Sodexo’s plant-based default exhibition stations, uptake increased from 31.8% to 81.5%.
At 11 NYC public hospitals, more than 50% of patients chose the plant-based default — even though fewer than 1% identified as vegetarian or vegan before the program launched.
The lesson: people don’t need to believe plant-based food is possible before experiencing it. Experience shifts the norm.
👉 Read the full research on Plant-Based Defaults →
Plant-based defaults have been successfully implemented across a wide range of food service settings:
What are plant-based defaults?
Plant-based defaults are a behavioral science strategy that makes plant-forward food the automatic choice in cafeterias, dining halls, coffee shops, and other food service settings — while keeping every other option available. Instead of asking people to change their habits, plant-based defaults change the system around them.
How do food nudges work?
Food nudges are small, intentional changes to how food is presented, ordered, or offered that guide people toward a particular choice without restricting their options. Examples include making plant-based dishes the default option, increasing the ratio of plant-based to meat items on a menu, or placing plant-forward options in the most visible positions.
Do plant-based defaults actually work?
Yes — and the evidence is strong. In a first-ever multi-site Sodexo study at Tulane, Lehigh, and RPI, plant-based defaults increased uptake from 30.8% to 81.5%. At 11 NYC Health & Hospitals, more than 50% of patients chose plant-based meals as their default meal.
What is choice architecture in food?
Choice architecture is the practice of designing how options are presented to make certain choices easier or more likely — without removing any options. In food service, this means arranging menus, cafeteria layouts, and ordering systems so that plant-forward choices are the path of least resistance.
What is the difference between a nudge and a default?
A nudge is any subtle design choice that encourages a behavior without mandating it. A default is a specific type of nudge — it makes one option the automatic choice unless someone actively selects otherwise. Plant-Based Defaults are the most powerful nudge strategy because they work passively.
Whether you’re a student, a dining director, an NGO partner, or a food service professional, there’s a role for you in making plant-based defaults the norm.