“In a Yale study, participants who were told they were drinking a high-calorie, unhealthy milkshake showed a three-fold greater drop in the hunger hormone ghrelin than participants who were told they were drinking a healthier, low-calorie shake, even though both groups drank the identical milkshake.”
Plain restatementA study conducted at Yale reported that the same milkshake produced a substantially steeper post-consumption decline in blood ghrelin when it was labeled as high-calorie and indulgent than when it was labeled as low-calorie and sensible. The "three-fold" figure describes the relative steepness of that decline.
This one is largely correct. The study is real: Crum and colleagues at Yale, published in Health Psychology in 2011, gave people the same 380-calorie milkshake but labeled it once as a 620-calorie indulgent shake and once as a 140-calorie sensible shake, and found a much steeper drop in the hunger hormone ghrelin when people thought they were drinking the indulgent version. The "three-fold" figure comes from the lead author's own descriptions of her results rather than from the paper's abstract, so it is her characterization rather than an invented number. Two details are off. It was not two separate groups: the same 46 people drank both labeled shakes about a week apart, which is actually a stronger design than described. And the indulgent condition also showed a bigger rise in ghrelin before drinking, so the dramatic fall is partly a drop from a higher starting point. The study measured one hormone over ninety minutes in 46 young adults, and I could not confirm whether it has been independently replicated, so it is best treated as an interesting single finding rather than settled science.
[drifted from the evidence:] In a [drifted from the evidence:] Yale study, [drifted from the evidence:] participants who were told they were drinking a high-calorie, unhealthy milkshake [drifted from the evidence:] showed a [drifted from the evidence:] three-fold greater drop in [drifted from the evidence:] the hunger hormone ghrelin than [drifted from the evidence:] participants who were told they were drinking a healthier, low-calorie [drifted from the evidence:] shake, even though both groups drank the [drifted from the evidence:] identical milkshake.
A study [added by the neutral restatement:] conducted at Yale reported that the same milkshake [added by the neutral restatement:] produced a [added by the neutral restatement:] substantially steeper post-consumption decline in [added by the neutral restatement:] blood ghrelin [added by the neutral restatement:] when it was labeled as high-calorie and indulgent than [added by the neutral restatement:] when it was labeled as low-calorie [added by the neutral restatement:] and sensible. The [added by the neutral restatement:] "three-fold" figure describes the relative steepness of that decline.
Red-tinted words in the claim drifted from the evidence. Green-tinted words are what a neutral restatement needs.
The trace / claim to source
- The study is real, was conducted at Yale, and the PMID given in the caption (21574706) is correct.
- Both conditions received an identical 380-calorie milkshake, differing only in the label.
- Ghrelin declined much more steeply after consumption in the indulgent-label condition, with a flat response in the sensible-label condition.
- The "three-fold" figure is not invented by the poster. It is the first author's own published description of the effect.
- Self-reported satiety tracked the label rather than the actual nutrition.
- The caption's other cited PMIDs correspond to genuinely well-known placebo literature. Based on background knowledge and not verified by retrieval in this session, PMID 24369076 corresponds to the 2013 NEJM sham arthroscopic meniscectomy trial, PMID 11498597 to the 2001 Science finding of placebo-induced dopamine release in Parkinson's disease, and PMID 17484949 to a reported nocebo case involving placebo capsules in an antidepressant trial. These should be treated as uninvestigated in this session.
- Design misdescription (omitted qualifier). Both the claim text ("participants who were told X... than participants who were told Y") and the transcript ("split people into two different groups") describe a between-groups experiment. It was a within-subjects crossover: the same 46 people did both conditions about a week apart. This does not weaken the finding, and arguably strengthens it, but the description is factually wrong.
- Omitted context on what the "drop" is measured from. The indulgent condition also showed a larger anticipatory rise in ghrelin before drinking, so the steeper decline is partly a fall from a higher pre-consumption peak, not simply a deeper trough. The video's framing of "a three-fold bigger drop" presents only half of the up-and-down curve.
- Precision framing. The "three-fold" figure describes the rate or slope of decline as characterized by the author in interviews. It is presented in the post as a plain study result, which implies more numerical precision than the published abstract language conveys.
- Scope inflation across the post as a whole. The transcript generalizes from one 46-person laboratory study to "what you believe isn't just in your head." The study measured a single hormone over 90 minutes, not health outcomes, weight, or metabolism. Even in sympathetic coverage, Crum is reported as saying this does not necessarily mean psychological beliefs about a meal control how we burn calories.
- Whether the exact phrase "three-fold" or a 3x numeric ratio appears in the published paper itself. I confirmed it in author interviews and press coverage, not in retrieved primary text.
- The precise effect size, confidence intervals, p-values, and whether the key interaction survived adjustment. Full-text statistics were not retrieved.
- Replication status. I found no direct independent replication attempt and no published failure to replicate, but my search budget was exhausted before this could be settled. A small single-site n=46 deception study from 2011 in a field with known replication problems should not be assumed to be robustly replicated. Treat this as unresolved, not as evidence either way.
- Whether the reported participant demographics (ages 18-35, normal to overweight BMI, one week between sessions) are exactly as stated, since these came from secondary coverage.
- The three secondary placebo claims in the caption were not independently verified in this session.
The cited PMID is real and matches a real study. The paper tested whether physiological satiation, measured by the gut peptide ghrelin, varies with the mindset in which food is approached. On two separate occasions, 46 participants consumed a 380-calorie milkshake under the pretense that it was either a 620-calorie "indulgent" shake or a 140-calorie "sensible" shake, with ghrelin measured via intravenous blood samples at baseline (20 min), anticipatory (60 min), and postconsumption (90 min). Between 20 and 60 minutes participants viewed and rated the misleading label, and between 60 and 90 minutes they drank and rated the shake. The reported result was that 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, with participants' self-reported satiety consistent with what they believed they were consuming. The authors concluded that the effect of food consumption on ghrelin may be psychologically mediated and that mindset meaningfully affects physiological responses to food. The specific "three-fold" number traces to the first author's own characterization of the result rather than to the abstract. Crum has described it as: when people thought they were consuming an indulgent shake, their ghrelin levels dropped at a three-fold steeper rate after consumption than when they thought they were consuming a low-calorie, sensible shake. She has repeated the same three-fold framing elsewhere, adding that their bodies responded as if they had consumed more food even though it was the exact same shake at both time points. Yale's own release describes the same finding. Yale reported that subjects were given a 380 calorie milkshake under the pretense that it was either a 620 calorie "indulgent" or 140 calorie "sensible" shake, that those who thought they drank the indulgent shake had a dramatically steeper decline in ghrelin, and that those who thought they drank the sensible shake had a flat ghrelin response. An important nuance appears in an independent peer-reviewed description of the study. In comparison to the "sensible" shake, the ghrelin increase was larger when expecting the "indulgent" milk shake, followed by a sharper decline of ghrelin levels 30 min after drinking the shake. A published commentary in the same issue described the pattern similarly. Participants led to believe the milkshake was high-calorie and indulgent showed an up-and-down ghrelin response characteristic of hunger followed by satiety, while the same participants drinking the same shake believing it was low-calorie showed an essentially flat response.
Complete reasoning
The reply receipt is formatted for pasting into the thread where the claim is circulating.
Compact share page: verify.trueseeker.com/s/f053b72ee7a4/_4Fm_Pim6Jl6csiedpAV9QW
Ask this case
Answers come only from the case file above; nothing is added.
Is it true that people drinking the same milkshake had different hormone responses depending on what they were told?
Yes. Participants drank an identical 380-calorie milkshake, but ghrelin dropped much more steeply after they were told it was a 620-calorie indulgent shake than when told it was a 140-calorie sensible shake.
Did the study use two separate groups of people?
No. This is a common misdescription. The same 46 people drank both labeled shakes about a week apart, so it was a within-subjects design, not two different groups.
Where does the 'three-fold' figure come from?
It comes from the lead author's own descriptions of the results in interviews and press coverage, not from the published paper's abstract. It is not an invented number, but it reflects her characterization of the effect rather than exact statistics confirmed in the full text.
Does the steeper ghrelin drop mean the indulgent shake caused a bigger overall effect?
Partly. The indulgent condition also showed a larger rise in ghrelin before drinking, so part of the steeper decline is a fall from a higher starting point, not simply a deeper drop after consumption.
Has this finding been confirmed by other studies?
The investigation did not establish this. No independent replication or failure to replicate was found, and the search was not exhaustive, so replication status remains unresolved.