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Brain Dopamine Dynamics in Obesity (BDDO)

keskiviikko 28. lokakuuta 2026 päivittänyt: Mireille Serlie, Yale University

This study measures the brain's dopamine response to milkshake consumption in people with a healthy weight and people with obesity and examines whether this response differs between the two groups. Dopamine release will be measured using ultra-high-resolution positron emission tomography (PET) imaging with the NeuroEXPLORER scanner. The study will also examine how the dopamine response relates to hormonal responses measured at the same time and to participants' food intake behavior.

Tutkimuksen yleiskatsaus

Tila

Ei vielä rekrytointia

Ehdot

Interventio / Hoito

Yksityiskohtainen kuvaus

This study aims to address three key questions: (1) whether the two phases of dopamine release in the striatum, a brain region involved in reward and motivation, during and after milkshake consumption differ between people with a healthy weight and people with obesity, and between men and women; (2) how metabolic and hormonal responses relate to dopamine release; and (3) whether dopamine-related networks outside the striatum differ between weight groups and predict eating behavior. These findings may improve our understanding of overeating and obesity and help inform the development of treatments that target the brain's dopamine system.

Each participant will complete four visits:

  1. Informed consent and screening to determine eligibility.
  2. A practice session to become familiar with PET scanning and the device used to deliver the milkshake.
  3. An MRI scan and assessments of eating behavior.
  4. A PET scan to measure dopamine release before and during milkshake delivery, with blood samples collected before and during the scan and questionnaires and tasks completed before and after the scan.

Opintotyyppi

Interventio

Ilmoittautuminen (Arvioitu)

100

Vaihe

  • Vaihe 1

Yhteystiedot ja paikat

Tässä osiossa on tutkimuksen suorittajien yhteystiedot ja tiedot siitä, missä tämä tutkimus suoritetaan.

Opiskeluyhteys

Tutki yhteystietojen varmuuskopiointi

Opiskelupaikat

  • Yhdysvallat
    • Connecticut
      • New Haven, Connecticut, Yhdysvallat, 06520
        • Yale School of Medicine

Osallistumiskriteerit

Tutkijat etsivät ihmisiä, jotka sopivat tiettyyn kuvaukseen, jota kutsutaan kelpoisuuskriteereiksi. Joitakin esimerkkejä näistä kriteereistä ovat henkilön yleinen terveydentila tai aiemmat hoidot.

Kelpoisuusvaatimukset

Opintokelpoiset iät

50 vuotta - 65 vuotta (Aikuinen, Vanhempi Aikuinen)

Hyväksyy terveitä vapaaehtoisia

Joo

Sukupuolet, jotka voivat opiskella

Kaikki

Kuvaus

Inclusion Criteria:

  • BMI 20-25 kg/m² (normal weight group) or BMI 30-45 kg/m² (obesity group)
  • Stable body weight in the 3 months prior to enrollment (<5%weight change)
  • Male sex or postmenopausal female (defined as cessation of menstrual periods for ≥12 consecutive months or FSH >25.8 mIU/mL)
  • Able to read, write, and speak English
  • Capable of giving informed consent

Exclusion Criteria:

  • Premenopausal status in women
  • Smoking (current use of any tobacco or nicotine products)
  • History of or current psychiatric disorder
  • History of or current neurological disorder
  • History of bleeding disorder or use of anticoagulants
  • History of or current eating disorder (Eating Disorder Examination Questionnaire)
  • Presence of type 1 or type 2 diabetes mellitus
  • Elevated liver enzymes (>2× the upper limit of normal)
  • Renal insufficiency (eGFR <15 mL/min/1.73m²)
  • Anemia and/or Hematocrit <35 vol%
  • Uncontrolled thyroid disease
  • Lactose intolerance
  • Current use of systemic hormone therapy, including oral, transdermal, or injectable estrogen or combined estrogen-progestogen preparations
  • Radiation exposure for research purposes within the past year such that participation in this study would place them over guideline limits for annual radiation exposure (an effective dose of 5 rem received per year).
  • Current, past or anticipated exposure to radiation in the workplace within one year
  • Presence of any somatic disorder or medication use that interferes with brain functional networks or metabolic response to food
  • Shift work
  • Current use of cannabis (any form), cocaine, amphetamines, or other recreational substances with known dopaminergic effects
  • Heavy alcohol use, defined as >15 standard drinks per week for men or >8 standard drinks per week for women (National Institute on Alcohol Abuse and Alcoholism thresholds)
  • Contraindications for MRI: metal implants incompatible with MRI, claustrophobia, large colored tattoos, or body weight >285 pounds
  • Pacemaker in situ or other implanted electronic device
  • Childhood-onset obesity (onset before age 10 years)
  • Current or past (within last year prior to enrollment) pharmacological obesity treatment
  • Past surgical obesity treatment (bariatric surgery)
  • Current use of structured meal replacement programs
  • Blood donation within 8 weeks prior to study
  • Active oral or perioral conditions that may alter taste perception or compromise safety during gustometer use

Opintosuunnitelma

Tässä osiossa on tietoja tutkimussuunnitelmasta, mukaan lukien kuinka tutkimus on suunniteltu ja mitä tutkimuksella mitataan.

Miten tutkimus on suunniteltu?

Suunnittelun yksityiskohdat

  • Ensisijainen käyttötarkoitus: Perustiede
  • Jako: Ei satunnaistettu
  • Inventiomalli: Rinnakkaistehtävä
  • Naamiointi: Ei mitään (avoin tarra)

Aseet ja interventiot

Osallistujaryhmä / Arm
Interventio / Hoito
Kokeellinen: Adults with obesity

Four visits per participant: screening, PET practice session, MRI+behavioral assessment, milkshake+PET scan.
Muut: Milkshake

Strawberry, banana, chocolate, or vanilla flavored, delivered through a gustometer during the practice session and PET scan.

Laite: NeuroEXPLORER

A next-generation ultra-high-performance dedicated human brain PET scanner.

Muut nimet:
  • Ultra high resolution PET scan
Lääke: [11C]raclopride

Carbon-11 radiolabeled PET ligand with high affinity and selectivity for postsynaptic dopamine receptors; one of the standard radiotracers for measuring dopamine release in humans.

Muut nimet:
  • injektio
Kokeellinen: Adults with normal weight

Four visits per participant: screening, PET practice session, MRI+behavioral assessment, milkshake+PET scan.
Muut: Milkshake

Strawberry, banana, chocolate, or vanilla flavored, delivered through a gustometer during the practice session and PET scan.

Laite: NeuroEXPLORER

A next-generation ultra-high-performance dedicated human brain PET scanner.

Muut nimet:
  • Ultra high resolution PET scan
Lääke: [11C]raclopride

Carbon-11 radiolabeled PET ligand with high affinity and selectivity for postsynaptic dopamine receptors; one of the standard radiotracers for measuring dopamine release in humans.

Muut nimet:
  • injektio

Mitä tutkimuksessa mitataan?

Ensisijaiset tulostoimenpiteet

Tulosmittaus
Toimenpiteen kuvaus
Aikaikkuna
Dopamine (DA) release
Aikaikkuna: Visit 4, approximately week 4. Baseline D2/3R binding potential will be assessed at T=30'. PET time-activity curves are then measured continuously for 60 minutes from milkshake onset.

Orosensory and post-ingestive DA release in the ventral and dorsal striatum during and after milkshake consumption
Visit 4, approximately week 4. Baseline D2/3R binding potential will be assessed at T=30'. PET time-activity curves are then measured continuously for 60 minutes from milkshake onset.
Time to onset of DA peaks
Aikaikkuna: Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).

Time to onset of orosensory and post-ingestive DA peaks in the ventral and dorsal striatum
Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).
Duration of DA peaks
Aikaikkuna: Visit 4, approximately week 4.PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).

Duration of orosensory and post-ingestive DA peaks in the ventral and dorsal striatum
Visit 4, approximately week 4.PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).
Time to onset of DA peaks between men and women
Aikaikkuna: Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).

Time to onset of orosensory and post-ingestive DA peaks in the ventral and dorsal striatum
Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).
Duration of DA peaks between men and women
Aikaikkuna: Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).

Duration of orosensory and post-ingestive DA peaks in the ventral and dorsal striatum
Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).
Magnitude of DA release between men and women
Aikaikkuna: Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).

Magnitude of orosensory and post-ingestive DA peaks in the ventral and dorsal striatum
Visit 4, approximately week 4. PET time-activity curves are measured continuously for 60 minutes from milkshake onset (30-90 minutes after initiation of radiotracer administration).

Toissijaiset tulostoimenpiteet

Tulosmittaus
Toimenpiteen kuvaus
Aikaikkuna
Glucose
Aikaikkuna: Glucose will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset at Visit 4, approximately week 4.

To assess the relationship between the metabolic response to the milkshake and striatal dopamine release, we will use a machine learning approach including network analysis.
Glucose will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset at Visit 4, approximately week 4.
Insulin
Aikaikkuna: Insulin will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset at Visit 4, approximately week 4.

To assess the relationship between the metabolic response to the milkshake and striatal dopamine release, we will use a machine learning approach including network analysis.
Insulin will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset at Visit 4, approximately week 4.
FFA
Aikaikkuna: FFA will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset at Visit 4, approximately week 4.

To assess the relationship between the metabolic response to the milkshake and striatal dopamine release, we will use a machine learning approach including network analysis.
FFA will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset at Visit 4, approximately week 4.
Gut peptides (tbd)
Aikaikkuna: Gut peptides will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset.

To assess the relationship between the metabolic response to the milkshake and striatal dopamine release, we will use a machine learning approach including network analysis.
Gut peptides will be collected after an overnight fast on the morning of the PET scan and at 7.5, 15, 30, and 45 minutes after milkshake onset.
Yale Food Addiction Scale 2.0 score
Aikaikkuna: After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI

Total score ranges from 0 to 11. Higher symptom counts indicate more symptoms of addictive-like eating.
After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI
Barratt Impulsiveness Scale (BIS-11) score
Aikaikkuna: After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI

A 30-item self-report questionnaire designed to measure human impulsiveness as a multidimensional personality and behavioral trait. Total score range 30 to 120, with higher scores reflecting greater impulsiveness.
After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI
Dietary Fat and Free Sugar - Short Questionnaire (DFS)
Aikaikkuna: After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI

A 26-item self-report tool to measure how often a person eats foods high in saturated fat and free sugar over the past 12 months. Total score range 26 to 130, with higher scores reflecting more frequent consumption of foods high in saturated fat and/or free sugars.
After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI
Change in Delay Discounting Task
Aikaikkuna: The task will be administered at the PET Center after an overnight fast at baseline (before radio tracer administration) and after the PET scan at T=105' (duration of the task is 10 minutes)

A behavioral assessment (computer task) to determine reward sensitivity (how much a person devalues a reward as the wait time for it increases). Calculated as Discount rate (k). Higher k indicates greater preference for immediate rewards.
The task will be administered at the PET Center after an overnight fast at baseline (before radio tracer administration) and after the PET scan at T=105' (duration of the task is 10 minutes)
Change in Iowa Gambling Task score
Aikaikkuna: The task will be administered at the PET Center after an overnight fast at baseline (before radio tracer administration) and after the PET scan at T=115' (duration of the task is 15 minutes)

The Iowa Gambling Task is a behavioral task that assesses decision-making under uncertainty by asking participants to select cards from four decks with different rewards and losses. The net score is calculated by subtracting the number of selections from disadvantageous decks from the number of selections from advantageous decks.
The task will be administered at the PET Center after an overnight fast at baseline (before radio tracer administration) and after the PET scan at T=115' (duration of the task is 15 minutes)
Behavioral Inhibition System/Behavioral Activation System Scale score
Aikaikkuna: After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI

The Behavioral Inhibition System/Behavioral Activation System (BIS/BAS) Scales assess sensitivity to punishment and reward. The questionnaire contains 24 items, including 20 scored items and 4 filler items. It yields four subscale scores: Behavioral Inhibition (7-28), BAS Drive (4-16), BAS Fun Seeking (4-16), and BAS Reward Responsiveness (5-20). Higher scores indicate greater sensitivity to punishment, stronger pursuit of goals, greater fun seeking, and greater responsiveness to reward, respectively.
After screening (visit 1), the PET test session (visit 2), the questionnaire will be administered during visit 3 (duration 10 minutes); after completion of the MRI
Change in Visual Analogue Scale (VAS) score
Aikaikkuna: The task will be administered at the PET Center after an overnight fast at baseline (before radio tracer administration) and after the PET scan at T=100' (duration of the task is 2 minutes)

VAS to assess hunger and satiety on a scale of 0-100. Higher hunger scores indicate greater hunger, while higher satiety/fullness scores indicate greater satiety/fullness
The task will be administered at the PET Center after an overnight fast at baseline (before radio tracer administration) and after the PET scan at T=100' (duration of the task is 2 minutes)

Yhteistyökumppanit ja tutkijat

Täältä löydät tähän tutkimukseen osallistuvat ihmiset ja organisaatiot.

Sponsori

Yale University

Yhteistyökumppanit

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Tutkijat

  • Päätutkija: Mireille Serlie, MD PhD, Yale University

Opintojen ennätyspäivät

Nämä päivämäärät seuraavat ClinicalTrials.gov-sivustolle lähetettyjen tutkimustietueiden ja yhteenvetojen edistymistä. National Library of Medicine (NLM) tarkistaa tutkimustiedot ja raportoidut tulokset varmistaakseen, että ne täyttävät tietyt laadunvalvontastandardit, ennen kuin ne julkaistaan ​​julkisella verkkosivustolla.

Opi tärkeimmät päivämäärät

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Sunnuntai 1. marraskuuta 2026

Ensisijainen valmistuminen (Arvioitu)

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Opintojen valmistuminen (Arvioitu)

Torstai 1. marraskuuta 2029

Opintoihin ilmoittautumispäivät

Ensimmäinen lähetetty

Torstai 15. lokakuuta 2026

Ensimmäinen toimitettu, joka täytti QC-kriteerit

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Ensimmäinen Lähetetty (Todellinen)

Keskiviikko 4. marraskuuta 2026

Tutkimustietojen päivitykset

Viimeisin päivitys julkaistu (Todellinen)

Keskiviikko 4. marraskuuta 2026

Viimeisin lähetetty päivitys, joka täytti QC-kriteerit

Keskiviikko 28. lokakuuta 2026

Viimeksi vahvistettu

Torstai 1. lokakuuta 2026

Lisää tietoa

Tähän tutkimukseen liittyvät termit

Avainsanat

Muita asiaankuuluvia MeSH-ehtoja

Muut tutkimustunnusnumerot

  • 2000042630
  • 1R01DK144194-01A1 (Yhdysvaltain NIH-apuraha/sopimus)

Yksittäisten osallistujien tietojen suunnitelma (IPD)

Aiotko jakaa yksittäisten osallistujien tietoja (IPD)?

JOO

IPD-suunnitelman kuvaus

Computer codes developed for MRI and PET analysis will be shared on the open-access GitHub platform to support reproducibility. The study protocol and clinical data generated from this study will be uploaded to ClinicalTrials.gov. De-identified neuroimaging and research data will be submitted to appropriate NIH data repositories in compliance with NIH data sharing requirements.

Lääke- ja laitetiedot, tutkimusasiakirjat

Tutkii yhdysvaltalaista FDA sääntelemää lääkevalmistetta

Joo

Tutkii yhdysvaltalaista FDA sääntelemää laitetuotetta

Ei

Yhdysvalloissa valmistettu ja sieltä viety tuote

Ei

Nämä tiedot haettiin suoraan verkkosivustolta clinicaltrials.gov ilman muutoksia. Jos sinulla on pyyntöjä muuttaa, poistaa tai päivittää tutkimustietojasi, ota yhteyttä register@clinicaltrials.gov. Heti kun muutos on otettu käyttöön osoitteessa clinicaltrials.gov, se päivitetään automaattisesti myös verkkosivustollemme .

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