Dinner Time 2: Effect of Delayed Eating or Sleeping on Metabolism
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 41
- 试验地点
- 1
- 主要终点
- Change in Glucose (mg/dl)
研究概览
简要总结
This study examines the acute impact of eating an "early" versus "late" dinner. "Early" and "late" will be customized to individuals based on the individuals' own circadian rhythms. Healthy adults will have the adults' circadian rhythm assessed by measuring the adults' dim light melatonin onset (DLMO). Based on the timing of DLMO, participants will be randomized to eating dinner before DLMO or after DLMO. The investigators will also compare the effects of delaying sleep relative to dinner time. Participants will eat meals in the laboratory and have serial plasma samples collected to examine profiles of free fatty acids, glucose, insulin, triglycerides, and oxidation of dietary fat.
详细描述
Obesity is a worldwide health problem. Recent studies suggest that the timing of meals may be critically important for weight control and cardiovascular health. Consuming calories later in the day is associated with greater risks of obesity, metabolic syndrome, and cardiovascular disease. Interventional diet studies also show more effective weight loss with early, rather than later eating. The investigators conducted a randomized crossover study comparing the metabolic effect of a "routine" dinner (RD,18:00) with that of an isocaloric "late" dinner (LD, 22:00) in 20 healthy volunteers. The investigators recently published results of this study, which the investigators now refer to as "Dinner Time 1". Relative to RD, LD increased post-dinner glucose peak by ~18% and lowered palmitate oxidation by ~10%. However, it is still unclear whether LD-induced impaired metabolic dysfunction is caused by eating at the "wrong" time relative to the body's central circadian clock, or it is caused by eating too close to bedtime, when sleep reduces metabolic demands.
To address this question, the investigators are now enlarging the scope of the present study, which the investigators now refer to as "Dinner Time 2". In Dinner Time 2, the investigators will examine the impacts of early dinner, late dinner, and the impact of delaying sleep after late dinner. The investigators will compare (1) the impact of early dinner time with later dinner time relative to DLMO with a routine sleep time; and (2) the impact of routine bedtime with late bedtime with a fixed late dinner time.
The investigators will examine the nocturnal and next-morning metabolic profile in a 3-arm randomized crossover study of healthy volunteers:
Arm 1: Early Dinner (dinner at DLMO-3, sleep at DLMO+2) Arm 2: Late Dinner (dinner at DLMO+1, sleep at DLMO+2) Arm 3: Late Dinner/Late Sleep (dinner at DLMO+1, sleep at DLMO+6)
The investigators will use serial blood sampling to assess the metabolic response to meals, and use an ingested stable isotope [(2H31)palmitate] tracer to calculate the oxidation of dietary lipid eaten at the different times.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Healthy male and female adult volunteers, age 18-30
- •BMI 18-30 kg/m2
- •Accustomed to a bedtime before 1:00 A.M. or having mid-sleep on free days (MSF) earlier than 5 A.M. from the Munich Chronotype Questionnaire (MCTQ) (to exclude extreme late chronotypes)
- •Exclusions:
- •Sleep disorder including insomnia, sleep apnea, circadian rhythm disorder, restless leg syndrome, narcolepsy, shift work sleep disorder
- •Gastroesophageal reflux disease that affects ability to tolerate a dinner close to bed time.
- •Chronic use of sedative hypnotics, anxiolytics, opiates
- •Use of medications that can affect circadian rhythm (beta blockers, melatonin)
- •Active smoking (may interfere with metabolism and Clinical Research Unit (CRU) activities)
- •Diabetes (type 1 or 2)
- •HbA1c point of care >= 6.5%
- •Kidney disease
- •Any known history of an inherited metabolic disorder
- •Pregnant or lactating female (pregnancy test will be required)
- •Professional or collegiate athlete
- •Travel across >1 time zone within a 3-month period before and during the protocol
- •DLMO > 24:00 will be excluded from the metabolic study visits
排除标准
- 未提供
研究组 & 干预措施
Early Dinner first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at an early dinner time (DLMO-3h) followed by a sleep study (DLMO+2h). This arm will cross-over to the other 2 arms in random order.
干预措施: Early dinner (Behavioral)
Early Dinner first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at an early dinner time (DLMO-3h) followed by a sleep study (DLMO+2h). This arm will cross-over to the other 2 arms in random order.
干预措施: Late Dinner (Behavioral)
Early Dinner first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at an early dinner time (DLMO-3h) followed by a sleep study (DLMO+2h). This arm will cross-over to the other 2 arms in random order.
干预措施: Late Dinner + Late Sleep (Behavioral)
Late Dinner first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at a late dinner time (DLMO+1h) followed by a sleep study (DLMO+2h). This arm will cross-over to the other 2 arms in random order.
干预措施: Early dinner (Behavioral)
Late Dinner first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at a late dinner time (DLMO+1h) followed by a sleep study (DLMO+2h). This arm will cross-over to the other 2 arms in random order.
干预措施: Late Dinner (Behavioral)
Late Dinner first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at a late dinner time (DLMO+1h) followed by a sleep study (DLMO+2h). This arm will cross-over to the other 2 arms in random order.
干预措施: Late Dinner + Late Sleep (Behavioral)
Late Dinner + Late Sleep first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at a late dinner time (DLMO+1h) followed by delayed bedtime (DLMO+6h). This arm will cross-over to the other 2 arms in random order.
干预措施: Early dinner (Behavioral)
Late Dinner + Late Sleep first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at a late dinner time (DLMO+1h) followed by delayed bedtime (DLMO+6h). This arm will cross-over to the other 2 arms in random order.
干预措施: Late Dinner (Behavioral)
Late Dinner + Late Sleep first
Participants will be served dinner and a stable isotope of palmitate to measure fat oxidation, at a late dinner time (DLMO+1h) followed by delayed bedtime (DLMO+6h). This arm will cross-over to the other 2 arms in random order.
干预措施: Late Dinner + Late Sleep (Behavioral)
结局指标
主要结局
Change in Glucose (mg/dl)
时间窗: Baseline, 4 weeks and 8 weeks
Serial blood samples taken during visit, 25 samples taken over 25 hours (One every hour) per visit.
次要结局
- Change in Free Fatty Acids (FFA, mmol/L)(Baseline, 4 weeks and 8 weeks)
- Change in Insulin (mcU/ml)(Baseline, 4 weeks and 8 weeks)
- Change in Triglycerides (mg/dl)(Baseline, 4 weeks and 8 weeks)
- Change in Oxidation of palmitate (percent of isotope enrichment)(Baseline, 4 weeks and 8 weeks)
- Change in melatonin [Dim light melatonin onset (DLMO)](At 2 weeks prior to baseline (samples drawn every 30 minutes, up to 7 hours))
- Sleep architecture(Baseline, 4 weeks and 8 weeks)