Shift Work, Heredity, Insulin, and Food Timing Study

Purpose

The purpose of this study is to determine whether night time eating that coincides with elevated endogenous melatonin impairs glucose tolerance, particularly in carriers of the MTNR1B risk allele.

Conditions

  • Shift Work Type Circadian Rhythm Sleep Disorder
  • Diabetes Mellitus, Type 2
  • Circadian Rhythm Sleep Disorder, Shift Work Type
  • Insulin Resistance

Eligibility

Eligible Ages
Between 18 Years and 60 Years
Eligible Genders
All
Accepts Healthy Volunteers
Yes

Inclusion Criteria

  • Male or non-pregnant female
  • 18-60 years
  • Currently employed (night shift workers and day workers), graduate students, part-time workers, or unemployed
  • Able and willing to give consent relevant to genetic investigation

Exclusion Criteria

  • Currently taking any medications for the treatment of diabetes
  • Currently taking medications known to affect glycemic parameters, such as glucocorticoids, growth hormone or fluoroquinolones
  • Pregnant, nursing or at risk of becoming pregnant
  • Chronic renal failure, hepatic diseases, or cancer diagnoses
  • Bulimia diagnosis, prone to binge eating
  • Chronic renal failure, hepatic diseases, or cancer diagnoses
  • Eating disorder diagnosis such as anorexia, binge eating, or bulimia
  • With psychiatric illness, such as schizophrenia or bipolar affective disorder
  • Blind
  • History of bariatric surgery

Study Design

Phase
Study Type
Observational
Observational Model
Cohort
Time Perspective
Cross-Sectional

Arm Groups

ArmDescriptionAssigned Intervention
Night Shift-Workers
Day Workers

Recruiting Locations

Massachusetts General Hospital
Boston, Massachusetts 02114
Contact:
Hassan S Dashti, PhD, RD
617-643-7167
SHIFTStudy@partners.org

More Details

NCT ID
NCT02997319
Status
Recruiting
Sponsor
Massachusetts General Hospital

Study Contact

Hassan S Dashti, PhD, RD
617-643-7167
SHIFTStudy@partners.org

Detailed Description

Preliminary observations suggest that food intake coincident with high melatonin levels leads to impaired glucose tolerance—particularly in MTNR1B risk allele carriers. Our objectives are to determine the effect of concurrent food intake and melatonin on glucose tolerance; and to assess the role of MTNR1B single nucleotide polymorphism (SNP)*melatonin interaction in this deleterious effect. Our central hypothesis is that concurrent high melatonin levels and food intake, commonly experienced in night shift workers, cause long-term impairment of glucose tolerance and that this effect is worse in carriers of the MTNR1B type 2 diabetes (T2D) risk SNP than in non-carriers. The results of this proposal will help to clarify an ongoing controversy about the role of melatonin in glucose tolerance, and will help to develop novel strategies in the prevention and treatment of T2D, especially in shift workers, night eaters, and MTNR1B risk allele carriers.