If you set a menu, you have more leverage than we do

We are honest elsewhere on this site that telling people facts is a poor way to change what they eat. People act and then construct reasons, and food is habit, price, convenience and company long before it is an argument. A site that only argues is aiming at the weakest lever available.

What the field evidence does support is duller and more useful: people choose from what is in front of them. Change the menu and the orders change, mostly without anyone noticing. That is your lever, not ours, so everything below is sourced, rated, and includes the trials that found nothing.

In a study of 94,644 meals across university cafeterias, raising the share of vegetarian options from a quarter to a half raised vegetarian sales by about 15 percentage points observationally and 7.8 points in the experimental arm.

A French replication found the odds of a vegetarian choice rose about 2.6 times, with slightly higher satisfaction, and only about 6% of diners noticed anything had changed.

The mechanism is not persuasion. It is that people choose from what is in front of them, and most of them are not making a considered decision at all.

Where it might not hold.

• Both studies are university catering with a captive audience. A supermarket, a pub or a wedding is a different problem.
• Nykänen and colleagues found that dish-of-the-day and menu-sequence nudges changed neither dish choice nor the weight of meat served.
• Plan with the experimental figure, not the observational one.

Stanford dining-hall trials served the same vegetables under different labels. Flavour-focused labels beat health-restrictive ones by 41% and basic ones by about 25%.

The Better Buying Lab found 'meat-free' underperformed nearly every alternative name. Describing a dish by what is missing invites loss aversion and makes the taste harder to imagine.

The same effect runs the other way: people rated an identical mango lassi as markedly less enjoyable when it was labelled healthy.

Where it might not hold.

• Measures what people select, not what they eat or what they do next time.
• University dining halls and partner restaurants are specific settings.
• Naming is not free: a name that oversells the dish will cost more in disappointment than it gains at the counter.

This is where we have to be careful, because the honest answer is that we do not know. Making the plant option the default, or moving it up the list, is widely recommended and thinly evidenced.

Nykänen and colleagues tested dish-of-the-day and menu-sequence changes in a university restaurant and found nothing: no change in which main dish was chosen, and no change in the weight of meat served. That is a clean null result in exactly the setting where availability worked.

So the two are not interchangeable. Availability has field evidence from two countries behind it. Sequence does not. If you only have the appetite for one change, make it the share of the menu, not the order of it.

Chefs and head chefs, contract caterers, procurement teams, student unions, workplace catering, hospitals and schools. Anyone who decides what the options are rather than choosing between them.

If you run one of these and want to talk about what you are considering, or you have data from a change you made and would let us record it, get in touch through the about page. Results that went nowhere are as useful to us as results that worked.