Heard this story on NPR this morning. The gist of it is that they monitored levels of a hunger hormone called ghrelin in two groups of people after drinking a milkshake. In one group, the milkshake was labeled as a healthy food with no fat or sugar and only 140 calories. In the other group, it was labeled as a decadent indulgence with 620 calories. The milkshake actually had 380 calories.
The group that drank the "decadent" shake had their ghrelin levels drop three times more than the people that drank the "healthy" shake. This means that they felt more satiated afterwards, less hungry, and their metabolism increased (because that is another effect of ghrelin). The people who drank the "healthy" shake were less satiated, more hungry, and slower metabolism after drinking the shake.
Here's the abstract from PubMed:
Quote:
METHODS:
On 2 separate occasions, participants (n = 46) consumed a 380-calorie milkshake under the pretense that it was either a 620-calorie "indulgent" shake or a 140-calorie "sensible" shake. Ghrelin was measured via intravenous blood samples at 3 time points: baseline (20 min), anticipatory (60 min), and postconsumption (90 min). During the first interval (between 20 and 60 min) participants were asked to view and rate the (misleading) label of the shake. During the second interval (between 60 and 90 min) participants were asked to drink and rate the milkshake.
RESULTS:
The mindset of indulgence produced a dramatically steeper decline in ghrelin after consuming the shake, whereas the mindset of sensibility produced a relatively flat ghrelin response. Participants' satiety was consistent with what they believed they were consuming rather than the actual nutritional value of what they consumed.
Link to the study: http://www.ncbi.nlm.nih.gov/pubmed/?term=crum+ghrelinMETHODS:
On 2 separate occasions, participants (n = 46) consumed a 380-calorie milkshake under the pretense that it was either a 620-calorie "indulgent" shake or a 140-calorie "sensible" shake. Ghrelin was measured via intravenous blood samples at 3 time points: baseline (20 min), anticipatory (60 min), and postconsumption (90 min). During the first interval (between 20 and 60 min) participants were asked to view and rate the (misleading) label of the shake. During the second interval (between 60 and 90 min) participants were asked to drink and rate the milkshake.
RESULTS:
The mindset of indulgence produced a dramatically steeper decline in ghrelin after consuming the shake, whereas the mindset of sensibility produced a relatively flat ghrelin response. Participants' satiety was consistent with what they believed they were consuming rather than the actual nutritional value of what they consumed.
Edit -- full text of the paper can be found here, I haven't read it yet: http://www.ruddcenter.yale.edu/resou...se_HP_5.11.pdf