I knew I was going to blog about this study
before I was even done with the abstract.
I suspect that it will be one of those things that once you hear it, it
makes total sense - but you never really thought about it before.
This study had an interesting approach. There are four studies, but the method is
about the same in each and I am only going to cover the first one. They created a fake restaurant menu and put a
daily special on the front. In every
case, the picture, the description, and the list of ingredients of the daily
special were exactly the same and it was made up of pasta, vegetables, and
dressing. The only thing different was the title. Half of the people saw it labeled as “Daily
Pasta Special” and half saw it as “Daily Salad Special.” Then they tested it on people who were either
dieting or not dieting. And they had
respondents rate the special for how healthy they thought it was and how good
it would taste.
First the non-dieters.
They didn’t seem to care what it was called. Non-dieters who saw the “salad” rated it the
same on expected healthfulness and expected taste as non-dieters who saw the
“pasta” (a little more healthy, but not statistically significant). Apparently, non-dieters don’t really care
about ingredients or titles, they just select what they want. The follow-up studies confirm this
explanation.
The dieters who saw the “salad” special rated its expected
healthfulness and taste the same as the non-dieters did. So they don’t look at healthy items as extra
special (a positive attitude). But the
dieters who saw the “pasta” special rated it less healthy and less tasty. They turned this into a negative
experience. So it wasn’t that dieters
are happy to get a salad or overconfident that the salad is healthier. It was that when they saw the “pasta”
special, they got a negative bias – expecting it to be less healthful and less
tasty. So when dieters look at a menu, they aren't happy that there are healthful options, they are unhappy at the unhealthful options, even if they don't have to order one.
In general, negative biases like this lead you to avoid the
option, have increased mental workload, more stress, and be less happy overall.
So if the dieters around you are
unhappy, it isn’t because they are always hungry, it is because they look at
the world with a negative frame.