In overweight men with prediabetes, five weeks of eating only during a 6-hour early window likely curbed evening appetite and boosted fullness without more hunger versus a 12-hour window.
See the scientific wording
In overweight or obese men with prediabetes, five weeks of early time-restricted feeding (a 6-hour daily eating window ending by mid-afternoon, with an 18-hour daily fast) likely reduces evening desire to eat and capacity to eat and increases evening fullness, without increasing hunger, compared with a 12-hour eating window, even when calories are matched and weight is stable. No numeric effect size, absolute risk, or relative risk was reported.
Indication only — weak evidence
Randomized trialsOne low-scoring study points this way, but the evidence is still early.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2018
This randomized crossover controlled feeding trial found that eTRF reduced evening desire to eat and capacity to eat and increased evening fullness, without a significant increase in hunger, even though participants fasted about 18 hours daily. The controlled design supports a causal effect of meal timing on appetite in this small sample.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
Scores reflect study quality, not just count.
Eating all meals in a 6-hour window that ends by mid-afternoon shifts food intake to the time of day when the body's internal clock is set to handle food best. This early eating keeps insulin levels low and helps the brain's fullness signals work properly. The long overnight fast then allows the stomach to empty and satiety hormones to stay active, so by evening the body feels full and does not signal hunger.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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In overweight men with prediabetes, five weeks of eating only during a 6-hour early window likely curbed evening appetite and boosted fullness without more hunger versus a 12-hour window.
Mechanism
1 studyEating all meals early in the day sets the body's internal clock to use food better and keeps insulin low. This helps the brain's fullness signals stay strong, so in the evening the body feels full and does not want to eat more. The long fast also changes how the body uses fat, which helps keep hunger away.
Eating all meals in a 6-hour window that ends by mid-afternoon shifts food intake to the time of day when the body's internal clock is set to handle food best. This early eating keeps insulin levels low and helps the brain's fullness signals work properly. The long overnight fast then allows the stomach to empty and satiety hormones to stay active, so by evening the body feels full and does not signal hunger.
All daily nutrient intake is compressed into a 6-hour window ending by mid-afternoon, so feeding occurs earlier in the biological day.
Earlier feeding aligns with the circadian system's upregulation of glucose, lipid, and energy metabolism, increasing insulin sensitivity and β-cell responsiveness and reducing circulating insulin levels.
Reduced insulin and improved insulin sensitivity restore hypothalamic leptin and insulin signaling, which increases satiety and reduces the drive to eat.
Circadian alignment of gut hormone secretion (GLP-1, PYY) and gastric emptying to earlier in the day produces earlier and stronger satiety signals that persist into the evening, increasing fullness and reducing capacity to eat.
The 18-hour daily fast extends from mid-afternoon to the next morning, increasing lipolysis and free fatty acid release; this metabolic shift, together with reduced oxidative stress and lower blood pressure, maintains a stable internal milieu that does not trigger compensatory hunger.
Evidence from Studies
Supporting (1)
Community contributions welcome
Early Time-Restricted Feeding Improves Insulin Sensitivity, Blood Pressure, and Oxidative Stress Even Without Weight Loss in Men with Prediabetes
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review and Meta-Analysis of Early Time-Restricted Feeding and Evening Appetite in Prediabetes
Systematic review and meta-analysis of randomized controlled trials in overweight or obese men with prediabetes comparing a 6-hour early eating window ending by mid-afternoon with an 18-hour fast versus a 12-hour eating window, with matched calories and stable weight, lasting at least 5 weeks, and measuring evening appetite ratings.
Randomized Crossover Trial of 5-Week Early TRF vs 12-Hour Window on Evening Appetite
Randomized crossover or parallel-group trial in overweight or obese men with prediabetes; intervention: 6-hour daily eating window ending by mid-afternoon with 18-hour daily fast for 5 weeks; comparator: 12-hour eating window; calories matched and weight stable; outcomes: evening desire to eat, capacity to eat, fullness, and hunger.
Prospective Cohort of Early vs Later Eating Windows and Evening Appetite in Prediabetes
Prospective cohort of overweight or obese men with prediabetes followed for at least 5 weeks, comparing those habitually using a 6-hour early eating window versus a 12-hour eating window, with repeated measures of evening desire to eat, capacity to eat, fullness, and hunger while accounting for calories and weight stability.
Cross-Sectional Survey of Eating Window Timing and Evening Appetite in Men with Prediabetes
Cross-sectional study measuring self-reported eating window timing/duration and evening desire to eat, capacity to eat, fullness, and hunger in overweight or obese men with prediabetes, with adjustment for calories and weight.
Expert Opinion on Early Time-Restricted Feeding for Evening Appetite Control in Prediabetes
Expert consensus statement or narrative review discussing early time-restricted feeding, evening appetite, and prediabetes, based on mechanistic reasoning and existing literature.