Silver Diner made salad the default kids' side — healthy orders jumped from 3% to 46%

In 2012 Silver Diner, a fast-casual chain in Maryland and Virginia, completely overhauled its children's menu. It added dishes like teriyaki salmon and quinoa pancakes alongside diner classics, took fries and sodas off the kids' menu entirely — customers could still request them — and made healthy sides such as salads and strawberries the default that arrived automatically.

Researchers at ChildObesity180, part of Tufts University's Friedman School of Nutrition, tracked what families ordered at every Silver Diner location in the six months before and after the change — some 350,000 children's meals. Before the overhaul, only about 3% of kids' meals met the nutritional standard of the National Restaurant Association's Kids Live Well program. After it, 46% did.

Behaviour followed the default: 57% of customers had ordered fries off the old menu, but once fries disappeared from it only 22% still requested them — and about 40% of customers stuck with whatever the default side was, healthy or not. The average kids' meal price rose just 19 cents, most customers never noticed, and the chain's revenues consistently increased during the study period.

Kids' meals meeting Kids Live Well nutrition standards went from 3% to 46% of orders; fry orders fell from 57% to 22%; revenue rose through the study period.

The chain changed the default rather than banning anything: fries and soda stayed available on request, so parents could still get them — customers were nudged, not lectured.

The healthy food was designed to be genuinely kid-appealing — 'we tempt them with the stuff they like, but we make sure it's also good for them', said co-founder Ype Von Hengst.

Choice architecture did the heavy lifting: as lead researcher Stephanie Anzman-Frasca noted, people tend to stick with the default rather than go out of their way to choose otherwise.

Silver Diner let scientists measure it: Tufts captured six months of order data on both sides of the change, turning a menu edit into published evidence in Obesity.

Defaults do the persuading: put the healthy option in the automatic slot and most customers never deviate — and they don't punish you for the swap, either.

The study was published in the journal Obesity in April 2015 and gave the industry its proof point. By then Disney Resorts had made fruit or vegetables and a healthful beverage automatic on children's menus, Burger King had swapped fries and soda for apples and milk as defaults, and McDonald's and Wendy's had dropped soda from kids' menus. The Center for Science in the Public Interest still found in 2012 that 97% of kids' meals failed basic nutritional standards — Silver Diner showed the fix was cheap, fast, and didn't cost a single customer.