Study analysis · Clinical nutrition ESPEN · 2016
What if eating MORE and exercising MORE after weight loss actually helps you keep the weight off?
After losing weight, people who exercise 500 calories a day and eat more burned 79 extra calories at rest and felt less hungry than those who stayed sedentary and ate less.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
In simple terms
This study tried two different ways of eating and exercising for a few days and saw that one way made people feel less hungry and burn more calories. But it only tested six people, so we can't say it will work the same for everyone.
What’s the bottom line?
After losing weight, your body tries to make you hungrier and burn fewer calories. This study tested if being very active and eating more could trick your body into not doing that.
How strong is this study?
The study did a good job by making each person try both ways and switching randomly, which helps avoid bias. But because only six people were tested and it lasted just five days, we can't trust the results to be strong or lasting — it's like testing a new snack on your two best friends and saying everyone will love it.
0 / 100
- COI disclosureconflicts of interest not disclosed
- Data availabilitydata not shared
- Code availabilitycode not shared
57 / 100
- Randomization+20/20
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=6)+0.6/20
- Follow-up+10/10
100 / 100
23 / 100
- P-values+15/15
- Effect sizeno effect size reported
- Confidence intervalsno confidence intervals
- Pre-registrationnot pre-registered
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 546 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
This design can establish causation. Although this is a randomized controlled trial, the extremely small sample size (n=6) and short duration (5-day conditions) limit the strength of causal inference. Randomization supports causality, but the findings may not be generalizable or robust due to low statistical power.
Key takeaways
- 01
People who exercised about 500 calories a day and ate more burned 79 extra calories at rest and felt less hungry and more full during the day.
- 02
Yes — burning 79 more calories daily and feeling less hungry could make it easier to avoid regaining weight, even if it doesn't change how your body processes food after meals.
Surprising findings
- Hunger and fullness improved without changes in insulin or glucose.Common nutrition advice says blood sugar control = appetite control. This study shows appetite can be regulated independently — suggesting physical activity may directly influence brain hunger signals.
- A 5-day intervention produced a measurable metabolic boost.Most metabolic adaptations take weeks or months to reverse — yet this study saw a 4.3% increase in RMR in just 5 days with high energy flux.
Practical takeaways
After losing weight, add 500 kcal/day of exercise and increase daily food intake by ~20-30% to potentially boost metabolism and reduce hunger.
This was tested on only 6 people for 5 days — long-term effects and sustainability are unknown. Don’t use this as permission to binge.
low confidenceWhy this study matters
79 Extra Calories at Rest
After weight loss, participants in the high-energy-flux state burned 79 kcal/day more at rest compared to the low-flux state — even though both groups consumed the same total calories over time. This was measured daily over 5 days with RMR testing.
Most people think metabolism slows down permanently after weight loss, but this suggests a simple behavioral tweak — more movement and more food — might partially reverse that slowdown.
Hunger Down, Fullness Up — Without Blood Sugar Changes
Participants reported 3% lower hunger and 2% higher fullness during the high-flux phase, even though post-meal glucose and insulin levels didn’t change at all — meaning appetite regulation wasn’t tied to blood sugar.
This challenges the idea that controlling blood sugar is the key to curbing hunger — suggesting physical activity and energy balance alone can influence appetite signals.
It’s Not About Thermic Effect
Despite eating more and moving more, the study found NO difference in the thermic effect of a meal — meaning the body didn’t burn extra calories digesting the food, just by being more active.
People think eating more = more calories burned digesting it. This study proves that’s not the mechanism — the metabolic boost came from elsewhere, likely muscle or hormonal adaptation.
Want the whole report?
Detailed mode opens the full scientific breakdown — every score component, the methodology, conflicts of interest, the evidence analysis behind each claim, and the raw study data.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
After losing weight, your body tries to make you hungrier and burn fewer calories. This study tested if being very active and eating more could trick your body into not doing that.
Research results
People who exercised about 500 calories a day and ate more burned 79 extra calories at rest and felt less hungry and more full during the day.
What this means - more context
Yes — burning 79 more calories daily and feeling less hungry could make it easier to avoid regaining weight, even if it doesn't change how your body processes food after meals.
This study tested whether a high-energy-flux state (high physical activity + high energy intake) could counteract the metabolic and appetite adaptations that promote weight regain after weight loss in obese adults.
After weight loss, a short-term high-energy-flux state increased resting metabolic rate by 79 kcal/day and reduced perceived hunger while increasing fullness compared to a low-energy-flux state, with no significant changes in postprandial glucose, insulin, or thermic effect of a meal.
Methods Used
Six obese adults completed two randomized 5-day conditions: Low Flux (sedentary, 1.35× RMR intake) and High Flux (∼500 kcal/day exercise + 1.7× RMR intake). RMR, hunger, fullness, postprandial glucose, insulin, and thermic effect of a meal were measured.
Main Finding
High-energy-flux increased resting metabolic rate by 79 kcal/day (P < 0.05) and significantly reduced perceived hunger (P < 0.03) while increasing fullness (P < 0.02), without altering postprandial glucose, insulin, or thermic effect of a meal.
Confidence Level
Low confidence due to very small sample size (n=6), short duration (5 days), and lack of confidence intervals or effect sizes beyond P-values.
Study Flags
Red Flags
- •Extremely small sample size (n=6)
- •Short intervention duration (5 days)
- •No reporting of effect sizes or confidence intervals
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Surprising Findings
Hunger and fullness improved without changes in insulin or glucose.
Common nutrition advice says blood sugar control = appetite control. This study shows appetite can be regulated independently — suggesting physical activity may directly influence brain hunger signals.
Practical Takeaways
After losing weight, add 500 kcal/day of exercise and increase daily food intake by ~20-30% to potentially boost metabolism and reduce hunger.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 546 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Human RCT
Subject
Moderate probability
on the GRADE evidence scale
This study tried two different ways of eating and exercising for a few days and saw that one way made people feel less hungry and burn more calories. But it only tested six people, so we can't say it will work the same for everyone.
Strengths
- Randomized crossover design reduces individual variability
- Controlled experimental conditions for both high and low flux states
- Direct measurement of RMR and hunger/fullness using standardized protocols
Weaknesses
- Extremely small sample size (n=6)
- Blinding status unknown, risking performance and detection bias
- Short duration of interventions (5 days) limits relevance to long-term weight maintenance
Methodology
Evidence Keywords
Statistical Reporting
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
After losing weight, your body tries to make you hungrier and burn fewer calories. This study tested if being very active and eating more could trick your body into not doing that.
Research results
People who exercised about 500 calories a day and ate more burned 79 extra calories at rest and felt less hungry and more full during the day.
What this means - more context
Yes — burning 79 more calories daily and feeling less hungry could make it easier to avoid regaining weight, even if it doesn't change how your body processes food after meals.
This study tested whether a high-energy-flux state (high physical activity + high energy intake) could counteract the metabolic and appetite adaptations that promote weight regain after weight loss in obese adults.
After weight loss, a short-term high-energy-flux state increased resting metabolic rate by 79 kcal/day and reduced perceived hunger while increasing fullness compared to a low-energy-flux state, with no significant changes in postprandial glucose, insulin, or thermic effect of a meal.
Methods Used
Six obese adults completed two randomized 5-day conditions: Low Flux (sedentary, 1.35× RMR intake) and High Flux (∼500 kcal/day exercise + 1.7× RMR intake). RMR, hunger, fullness, postprandial glucose, insulin, and thermic effect of a meal were measured.
Main Finding
High-energy-flux increased resting metabolic rate by 79 kcal/day (P < 0.05) and significantly reduced perceived hunger (P < 0.03) while increasing fullness (P < 0.02), without altering postprandial glucose, insulin, or thermic effect of a meal.
Confidence Level
Low confidence due to very small sample size (n=6), short duration (5 days), and lack of confidence intervals or effect sizes beyond P-values.
Study Flags
Red Flags
- •Extremely small sample size (n=6)
- •Short intervention duration (5 days)
- •No reporting of effect sizes or confidence intervals
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Surprising Findings
Hunger and fullness improved without changes in insulin or glucose.
Common nutrition advice says blood sugar control = appetite control. This study shows appetite can be regulated independently — suggesting physical activity may directly influence brain hunger signals.
Practical Takeaways
After losing weight, add 500 kcal/day of exercise and increase daily food intake by ~20-30% to potentially boost metabolism and reduce hunger.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 546 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Human RCT
Subject
Moderate probability
on the GRADE evidence scale
This study tried two different ways of eating and exercising for a few days and saw that one way made people feel less hungry and burn more calories. But it only tested six people, so we can't say it will work the same for everyone.
Strengths
- Randomized crossover design reduces individual variability
- Controlled experimental conditions for both high and low flux states
- Direct measurement of RMR and hunger/fullness using standardized protocols
Weaknesses
- Extremely small sample size (n=6)
- Blinding status unknown, risking performance and detection bias
- Short duration of interventions (5 days) limits relevance to long-term weight maintenance
Methodology
Evidence Keywords
Statistical Reporting
Scoring
How strong is this study?
The study did a good job by making each person try both ways and switching randomly, which helps avoid bias. But because only six people were tested and it lasted just five days, we can't trust the results to be strong or lasting — it's like testing a new snack on your two best friends and saying everyone will love it.
0 / 100
- COI disclosureconflicts of interest not disclosed
- Data availabilitydata not shared
- Code availabilitycode not shared
57 / 100
- Randomization+20/20
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=6)+0.6/20
- Follow-up+10/10
100 / 100
23 / 100
- P-values+15/15
- Effect sizeno effect size reported
- Confidence intervalsno confidence intervals
- Pre-registrationnot pre-registered
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 546 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
This design can establish causation. Although this is a randomized controlled trial, the extremely small sample size (n=6) and short duration (5-day conditions) limit the strength of causal inference. Randomization supports causality, but the findings may not be generalizable or robust due to low statistical power.
Standing
Who’s using this study?
The videos and claims on this site that lean on this study, and the researchers who wrote it.
1 video from Thomas DeLauer cite this study, drawing 2 claims from it.