Cited by 11Misinformation and Its ImpactsHealth Literacy and Information AccessibilityAcademic Publishing and Open Access

Festive medical myths

Open access
Vreeman, R. C., Carroll, A. E.·2008·BMJ

Abstract

More medical myths hit the dust, thanks to Rachel C Vreeman and Aaron E Carroll

Integrity signals

Registry

Crossref · 10.1136/bmj.a2769

Cites

25 of 25 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

3 of 48 cited sources checked · 0 supported · 0 flagged · accuracy not yet measured

  • Interpretationcitation

    The myth probably originated with an old military study where subjects in arctic survival suits without hats lost most heat through their heads because it was the only exposed part.

    “This myth probably originated with an old military study in which scientists put subjects in arctic survival suits (but no hats) and measured their heat loss in extremely cold temperatures.20 Because it was the only part of the subjects' bodies that was exposed to the cold, they lost the most heat through their heads.”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [20] 20. Dubois L, Girard M, Potvin Kent M, Farmer A, Tatone-Tokuda F. Breakfast skipping is associated with differences in meal patterns, macronutrient intakes and overweight among pre-school children. Public Health Nutr 2008:1-10. source

      The paper’s Discussion and energy-and-macronutrient analyses concern breakfast skipping, diet, and overweight in pre-school children. Searches for arctic survival suits, an old military study, and heat loss through the head found no passage addressing the claim. (LLM, conf=0.76)

      Experimental — accuracy not yet measured
  • Premisecitation

    Had the experiment been performed with subjects wearing only swimsuits, they would not have lost more than 10% of their body heat through their heads.

    “Experts say, however, that had this experiment been performed with subjects wearing only swimsuits, they would not have lost more than 10% of their body heat through their heads.20”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [20] 20. Dubois L, Girard M, Potvin Kent M, Farmer A, Tatone-Tokuda F. Breakfast skipping is associated with differences in meal patterns, macronutrient intakes and overweight among pre-school children. Public Health Nutr 2008:1-10. source

      The Methods and Energy and macronutrient analyses sections concern breakfast habits and dietary intake in pre-school children. Searches for the swimsuit experiment and heat loss through the head found no relevant passage in our copy, so it cannot verify the claimed 10% figure. (LLM, conf=0.78)

      Experimental — accuracy not yet measured
  • Premisecitation

    When parents think their children have been given a drink containing sugar (even if it is really sugar-free), they rate their children's behaviour as more hyperactive.

    “When parents think their children have been given a drink containing sugar (even if it is really sugar-free), they rate their children's behaviour as more hyperactive.4”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [4] 4. Hillard JR, Holland JM, Ramm D. Christmas and psychopathology. Data from a psychiatric emergency room population. Arch Gen Psychiatry 1981;38:1377-81. source
  • Interpretationcitation

    Sugar consumption does not cause hyperactivity in children.

    “Regardless of what parents might believe, however, sugar is not to blame for out of control little ones.”
    • Also stated in: § Abstract · hedged
      “None of these studies, not even studies looking specifically at children with attention-deficit/hyperactivity disorder, could detect any differences in behaviour between the children who had sugar and those who did not.”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [2] 2. Nishi M, Miyake H, Okamoto H, Goto Y, Sakai T. Relationship between suicide and holidays. J Epidemiol 2000;10:317-20. source
    • cites [3] 3. Panser LA, McAlpine DE, Wallrichs SL, Swanson DW, O'Fallon WM, Melton LJ, 3rd. Timing of completed suicides among residents of Olmsted County, Minnesota, 1951-1985. Acta Psychiatr Scand 1995;92:214-9. source
  • Premisecitation

    In double-blind randomised controlled trials, children on diets with different sugar levels showed no differences in behaviour, including children with attention-deficit/hyperactivity disorder or those considered sensitive to sugar.

    “At least 12 double blind randomised controlled trials have examined how children react to diets containing different levels of sugar. 2 None of these studies, not even studies looking specifically at children with attention-deficit/hyperactivity disorder, could detect any differences in behaviour between the children who had sugar and those who did not.3”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [2] 2. Nishi M, Miyake H, Okamoto H, Goto Y, Sakai T. Relationship between suicide and holidays. J Epidemiol 2000;10:317-20. source
    • cites [3] 3. Panser LA, McAlpine DE, Wallrichs SL, Swanson DW, O'Fallon WM, Melton LJ, 3rd. Timing of completed suicides among residents of Olmsted County, Minnesota, 1951-1985. Acta Psychiatr Scand 1995;92:214-9. source
  • May combine two claims. 12
  • Classified as probably not a substantial claim. 2
  • May combine two claims.

    Interpretationcitation

    There is nothing special about the head and heat loss.

    “A more recent study confirms that there is nothing special about the head and heat loss.21”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [21] 21. Pittler MH, Verster JC, Ernst E. Interventions for preventing or treating alcohol hangover: systematic review of randomised controlled trials. BMJ 2005;331:1515-8. source

      The Conclusions (page unavailable) address interventions for alcohol hangover, not heat loss from the head. Searches for head heat loss and body-temperature comparisons found no passage in our copy addressing the claim. (LLM, conf=0.78)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    In Japan 1979-94, the suicide rate was lowest in the days before a holiday and highest in the days after the holiday.

    “One study from Japan that looked at suicides in 1979-94 showed that the rate of suicide was lowest in the days before a holiday and highest in the days after the holiday.8”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [8] 8. Zonda T, Bozsonyi K, Veres E. Seasonal fluctuation of suicide in Hungary between 1970-2000. Arch Suicide Res 2005;9:77-85. source
  • May combine two claims.

    Premisecitation

    In 92 cases, children ingested substantial quantities of poinsettias, but none needed medical treatment.

    “In 92 of the cases, children ingested substantial quantities of poinsettias, but none needed medical treatment, and toxicologists concluded that poinsettia exposures and ingestions can be treated without referral to a healthcare facility.17”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [17] 17. Consoli A, Capani F, Del Ponte A, Guagnano T, Iezzi M, Ditano G, et al. [Effect of scheduling of meal times on the circadian rhythm of energy expenditure]. Boll Soc Ital Biol Sper 1981;57:2322-4.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationcitation

    Around the world, suicides peak in warmer months and are lowest in winter.

    “Around the world, suicides peak in warmer months and are actually lowest in the winter.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [13] 13. O'Connor A. The claim: you lose most of your body heat through your head. New York Times October 26, 2004. URL here.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [14] 14. Pretorius T, Bristow GK, Steinman AM, Giesbrecht GG. Thermal effects of whole head submersion in cold water on nonshivering humans. J Appl Physiol 2006;101:669-75. source
    • cites [15] 15. Berteus Forslund H, Lindroos AK, Sjostrom L, Lissner L. Meal patterns and obesity in Swedish women-a simple instrument describing usual meal types, frequency and temporal distribution. Eur J Clin Nutr 2002;56:740-7. source
  • May combine two claims.

    Interpretationreasoning

    Obesity and eating more meals at night are associated, but one does not cause the other.

    “But just because obesity and eating more meals at night are associated, it does not mean that one causes the other.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [22] 22. How to handle a hangover. Drinking fluids may help with the morning-after misery from getting drunk. Harv Health Lett 2006;31:3.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    In Finland, suicides peak in autumn and are lowest in winter.

    “In Finland, suicides peak in autumn and are lowest in the winter.13”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [13] 13. O'Connor A. The claim: you lose most of your body heat through your head. New York Times October 26, 2004. URL here.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    In the US, rates of psychiatric visits decrease before Christmas and increase again afterwards.

    “In the US, rates of psychiatric visits decrease before Christmas and increase again afterwards.10”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [10] 10. Krenzelok EP, Jacobsen TD, Aronis JM. Poinsettia exposures have good outcomes . . . just as we thought. Am J Emerg Med 1996;14:671-4. source
  • May combine two claims.

    Interpretationreasoning

    The obese women in the Swedish study were not just night eaters, they were also eating more meals, and taking in more calories makes you gain weight regardless of when calories are consumed.

    “The obese women were not just night eaters, they were also eating more meals, and taking in more calories makes you gain weight regardless of when calories are consumed.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [22] 22. How to handle a hangover. Drinking fluids may help with the morning-after misery from getting drunk. Harv Health Lett 2006;31:3.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • Rests on an assumption: People gain weight because they take in more calories overall than they burn up.
  • May combine two claims.

    Premisecitation

    In a 30 year study of suicides in Hungary, highest rates were in summer and lowest in winter.

    “In a 30 year study of suicides in Hungary, researchers again found the highest rates of suicides in the summer and the lowest in the winter.14”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [14] 14. Pretorius T, Bristow GK, Steinman AM, Giesbrecht GG. Thermal effects of whole head submersion in cold water on nonshivering humans. J Appl Physiol 2006;101:669-75. source
  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductnone given

    This was not a systematic review of either the evidence to refute these medical myths or of doctors' beliefs.

    “This was not a systematic review of either the evidence to refute these medical myths or of doctors' beliefs.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    In a study of over 2500 patients, eating at night was not associated with weight gain, but eating more than three times a day was linked to being overweight or obese.

    “In a study of over 2500 patients, eating at night was not associated with weight gain, but eating more than three times a day was linked to being overweight or obese.25”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [25] 25. McGregor NR. Pueraria lobata (Kudzu root) hangover remedies and acetaldehyde-associated neoplasm risk. Alcohol 2007;41:469-78.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    We applied rigorous search methods to compile data.

    “None the less, we applied rigorous search methods to compile data, and evidence of the prevalence of these medical beliefs is readily available.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationcitation

    Studies have connected skipping breakfast with gaining more weight, but this is not because breakfast skippers eat more at night.

    “Studies have connected skipping breakfast with gaining more weight, but this is not because breakfast skippers eat more at night.26”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [26]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

13 of 13
  • The paper relies on this without support.

    The medical beliefs discussed are commonly held.

    “we previously discussed the evidence disputing seven commonly held medical myths.”
    “We generated a list of common medical or health beliefs related to the holidays and winter season”
  • The paper relies on this without support.

    A hangover is caused by excess alcohol consumption.

    “A hangover is caused by excess alcohol consumption.”
  • The paper relies on this without support.

    People gain weight because they take in more calories overall than they burn up.

    “People gain weight because they take in more calories overall than they burn up.”
  • The paper relies on this without support.

    Any uncovered part of the body loses heat and will reduce the core body temperature proportionally.

    “Any uncovered part of the body loses heat and will reduce the core body temperature proportionally.”
  • The paper relies on this without support.

    Evidence of the prevalence of these medical beliefs is readily available.

    “None the less, we applied rigorous search methods to compile data, and evidence of the prevalence of these medical beliefs is readily available.”
5 of 5

Cites

Flagged first, then by citations

Research works printed but not linked: 1

  1. [22]22. How to handle a hangover. Drinking fluids may help with the morning-after misery from getting drunk. Harv Health Lett 2006;31:3.

Cited by

Sorted by citations

Authors
Vreeman, R. C., & Carroll, A. E.
Affiliations
Indiana University Indianapolis (US)
Corresponding author
Vreeman, R. C.
Venue
BMJ
Publisher
BMJ
Published
2008-05-29
Volume
337
Issue
dec17 2
Pages
a2769-a2769
ISSN
1756-1833 (ISSN-L)
OpenAlex
W2094536649
Cited by
11
References
25
Citations by year
2026: 1 · 2021: 1 · 2018: 2 · 2017: 2 · 2014: 1 · 2013: 2
FWCI
2.31
Type
journal article
Language
en
Open access
Locations
  • BMJ (publishedVersion)
  • PubMed (publishedVersion)
  • IUScholarWorks (Indiana University) (submittedVersion)
Topics
  • Social Sciences › Sociology and Political Science › Misinformation and Its Impacts
  • Health Sciences › Health Professions › General Health Professions › Health Literacy and Information Accessibility
  • Social Sciences › Decision Sciences › Information Systems and Management › Academic Publishing and Open Access
Keywords
health myths, health misinformation, public health communication
MeSH terms
Ethanol, Anniversaries and Special Events, Child, Christianity, Feeding Behavior, Holidays, Humans, Hypothermia, Mythology, Plants, Toxic, Psychomotor Agitation, Suicide, Weight Gain, Dietary Sucrose

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-11.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-11.

Cited sources are checked by gpt-6-sol.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

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