Home›Diabetes & Endocrinology› Intermittent fasting plus early time-restricted eating results in greater weight loss than standard care
Intermittent fasting plus early time-restricted eating results in greater weight loss than standard careIntermittent fasting and calorie restriction both help with weight loss
Clinical nutrition (Edinburgh, Scotland)Published July 2, 2026Study authors: Teong Xiao Tong, Liu Kai, Vincent Andrew D, Liu Bo, Wittert Gary A, Hutchison Amy T, Heilbronn Leoni…PubMed ↗NCT03689608 ↗DOI ↗Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease
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Key Takeaway
Note that both iTRE and calorie restriction effectively reduce weight but may utilize different behavioral pathways.
This study is an exploratory analysis of a randomized controlled trial involving 209 adults with obesity. The primary objective was to evaluate the efficacy and underlying behavioral mechanisms of intermittent fasting combined with early time-restricted eating (iTRE) compared to standard calorie restriction (CR) and standard care (SC). The study assessed outcomes at two follow-up intervals: 6 months and 18 months.
The intervention group received intermittent fasting plus early time-restricted eating (iTRE), while the comparator group received calorie restriction (CR) and standard care (SC). The primary outcome measured was weight loss. Secondary outcomes included assessments of eating behavior, mood, sleep, and quality of life.
Regarding the primary outcome, the study found greater weight loss in both the iTRE and CR groups compared to the SC group at month 2 and month 6. While the results indicate that both dietary strategies are effective for weight reduction relative to standard care, specific effect sizes or p-values were not reported for this comparison.
Secondary outcomes provided insight into the behavioral mechanisms of these interventions. The study found greater increases in dietary restraint in the CR group compared to both the iTRE and SC groups at month 2, 6, and 18. Conversely, there were greater reductions in disinhibition and feelings of hunger in the CR group compared to the iTRE and SC groups at month 6. A mediation analysis was conducted to determine how these behaviors influenced weight loss. The study found no detectable mediation effect of change in dietary restraint on weight loss across any group. However, disinhibition appeared to mediate the effect on weight loss specifically in the CR group, accounting for 15% of the total treatment effect.
Safety and tolerability data were not reported for this analysis, including specific rates for adverse events, serious adverse events, or study discontinuations. Because this is an exploratory analysis, the results should be interpreted with caution regarding their definitive impact on clinical guidelines.
These findings contribute to the understanding of dietary interventions for obesity by suggesting that while iTRE and CR both achieve weight loss, they may do so through different pathways. Specifically, the role of disinhibition appears more prominent in the calorie restriction pathway than in the iTRE pathway. This distinction is important for clinicians when counseling patients on the specific behavioral expectations of different dietary protocols.
Methodological limitations include the fact that this is an exploratory analysis of a randomized controlled trial, which may limit the generalizability or certainty of the findings. Additionally, the mediation effect of disinhibition in the CR group was relatively small, accounting for only 15% of the total treatment effect. Questions remain regarding the long-term sustainability of weight loss beyond the 18-month follow-up and whether these behavioral differences translate to different levels of patient adherence over time.
How this fits prior evidence
How this fits prior evidence
This finding addresses a gap in understanding the specific behavioral mechanisms underlying different dietary interventions for obesity. While previous coverage has identified risk factors for sarcopenic obesity, such as age, physical inactivity, diabetes, and hypertension, this study provides specific data on how iTRE and CR differ in their impact on dietary restraint and disinhibition.
Living with obesity can be a daily struggle that affects your physical health and your confidence. For many people, the hardest part is finding a sustainable way to manage weight without feeling like they are constantly fighting against their own habits. New research looks at two popular methods: intermittent fasting combined with early time-restricted eating (iTRE) and traditional calorie restriction (CR). Both methods aim to help people lose weight, but this study looked deeper into the mental behaviors that drive those results.
Researchers conducted a trial involving 209 adults living with obesity. They compared two different approaches: one group followed an intermittent fasting plan where they ate only during specific early hours of the day, and another group focused on limiting their total daily calories. A third group received standard care for comparison. The researchers tracked these participants for up to 18 months to see how much weight they lost and how their eating behaviors changed over time.
The results showed that both the intermittent fasting group and the calorie restriction group lost more weight than those receiving standard care at the 6-month mark. However, the study found that these two methods might work for different reasons in the brain. For example, people on the calorie restriction plan showed a much higher increase in dietary restraint—the ability to say no to certain foods—compared to those doing intermittent fasting. On the other hand, the calorie plans helped significantly reduce feelings of hunger and 'disinhibition,' which is that feeling of losing control over what you eat.
It is important to keep these findings in perspective. This specific study was an exploratory analysis, which means it was designed to look for patterns rather than provide a definitive rule. While the data suggests that calorie restriction helped reduce feelings of hunger, this only accounted for about 15% of the total weight loss effect. Because this was an exploratory look at the data, we cannot say for certain exactly how much each behavior contributes to success.
For people looking for a way to manage their weight today, these results suggest that both methods are effective tools. Whether you prefer timing your meals or counting your calories, both paths can lead to weight loss. The choice might depend on which mental approach feels more manageable for your personal lifestyle and goals.
What this means for you:
Both intermittent fasting and calorie restriction help with weight loss, but they may influence different habits.
BACKGROUND AND AIMS: Psychological and behavioural effects influence diet adherence and mediate the effectiveness of lifestyle interventions but are poorly studied with intermittent fasting approaches. Therefore, we compared the effects of intermittent fasting versus calorie restriction on eating behavior, mood, sleep, and quality of life after 6 months and 18 months.
METHODS: This is an exploratory analysis of a randomized controlled trial with 6-month intervention and 12-month follow-up. Adults (n = 209, 57% female; 58 ± 10 years, 34.8 ± 4.7 kg/m) with obesity were randomized to one of three groups (2:2:1): (i) intermittent fasting plus early time-restricted eating (iTRE, 30% energy requirements between 8am and 12pm followed by 20-h fasting three non-consecutive days, non-restricted on other days), (ii) calorie restriction (CR, 70% energy requirements), (iii) standard care (SC). Both iTRE and CR groups received nutritional support biweekly, whereas SC was provided healthy guidelines at baseline only. Eating behaviors, mood, sleep, mood and quality of life were assessed using validated questionnaires at month 0, 2, 6, 18. Mediation analysis was performed to examine the relationship between eating behavior and weight loss at 2 and 6 months.
RESULTS: Greater weight loss was observed in iTRE and CR versus SC at month 2 and 6. However, greater increases in dietary restraint were observed in CR versus iTRE and SC at month 2, 6 and 18. Greater reductions in disinhibition and feelings of hunger were also observed in CR versus iTRE and SC at month 6. There was no detectable mediation effect of change in dietary restraint on weight loss, but disinhibition appeared to mediate the effect on weight loss in CR, accounting for 15% of the total treatment effect.
CONCLUSION: Both intermittent fasting and CR effectively induce weight loss, but they potentially act through distinct behavioural pathways, with disinhibition playing a more prominent role in CR.
CLINICALTRIALS: gov identifier, NCT03689608.
