In mice fed a high-fat diet, repeatedly losing and regaining weight did not change how much energy they used, what type of fuel they burned, or their overall energy balance by the end of the study.
See the scientific wording
In male C57BL/6J mice fed a fixed high-fat diet, weight cycling had no effect on energy expenditure, respiratory exchange ratio, or energy balance at the study endpoint.
Correlational — new studies may shift this
Randomized trialsOne low-scoring study links this claim to the outcome, but causation is not established.
What the research says
1 study reviewedSupporting (1)
Cohort StudyAnimal2017
Mice that kept losing and gaining weight on the same food burned the same amount of energy and stored fat just like mice that never dieted—no slowdown or extra fat storage happened because of the weight cycling.
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.
When mice repeatedly lose and regain weight on the same high-fat diet, they eat less food overall over time, so they don’t store extra fat or burn fewer calories — even after gaining weight back. This lower total food intake keeps their energy use and fat storage the same as mice that never dieted, as shown in the study with DOI 10.3390/nu9101149.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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In mice fed a high-fat diet, repeatedly losing and regaining weight did not change how much energy they used, what type of fuel they burned, or their overall energy balance by the end of the study.
Mechanism
1 studyWhen mice lose and regain weight repeatedly on the same high-fat diet, they simply eat less food overall over time — so even though they gain weight back, they don’t burn fewer calories or get better at storing fat. This is shown in the study with DOI 10.3390/nu9101149, where total food intake stayed lower in cycling mice, keeping their energy use and fat levels the same as mice that never dieted.
When mice repeatedly lose and regain weight on the same high-fat diet, they eat less food overall over time, so they don’t store extra fat or burn fewer calories — even after gaining weight back. This lower total food intake keeps their energy use and fat storage the same as mice that never dieted, as shown in the study with DOI 10.3390/nu9101149.
Repeated cycles of calorie restriction reduce daily food intake below maintenance levels during each restriction phase, leading to a sustained deficit in cumulative energy intake over the entire study period, as directly measured in mice on a fixed high-fat diet (10.3390/nu9101149).
Reduced cumulative energy intake drives a persistent negative energy balance during restriction phases, mobilizing stored lipids from white adipose tissue without altering lean mass, resulting in smaller adipocytes and lower fat mass (10.3390/nu9101149).
During re-feeding periods, food intake returns to baseline levels, but total cumulative intake remains lower in weight-cycled mice compared to controls, preventing full restoration of adipose tissue mass despite unchanged food efficiency (10.3390/nu9101149).
Energy expenditure and respiratory exchange ratio remain unchanged throughout the weight cycling protocol, indicating no metabolic adaptation such as reduced energy use or increased efficiency of weight gain occurs, as directly measured at endpoint (10.3390/nu9101149).
Evidence from Studies
Supporting (1)
Community contributions welcome
Mice that kept losing and gaining weight on the same food burned the same amount of energy and stored fat just like mice that never dieted—no slowdown or extra fat storage happened because of the weight cycling.
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 of Weight Cycling Effects on Energy Expenditure in Rodent Models on High-Fat Diets
Systematic review and meta-analysis of all peer-reviewed controlled studies in male C57BL/6J mice on fixed high-fat diets comparing weight-cycled groups to stable-weight controls, measuring energy expenditure, respiratory exchange ratio, and energy balance at endpoint.
Randomized Controlled Trial of Weight Cycling vs Stable Weight in Male C57BL/6J Mice on High-Fat Diet
Randomized assignment of male C57BL/6J mice on a fixed high-fat diet to either a weight cycling protocol (repeated cycles of weight loss and regain) or a stable weight control group, with blinded measurement of energy expenditure, respiratory exchange ratio, and energy balance at endpoint.
Prospective Cohort Study of Weight Cycling Trajectories and Metabolic Outcomes in Male C57BL/6J Mice on High-Fat Diet
Prospective observation of male C57BL/6J mice on a fixed high-fat diet, tracking individual weight trajectories over multiple cycles and measuring energy expenditure, respiratory exchange ratio, and energy balance at endpoint without experimental manipulation.
Single-Center Animal Study Measuring Metabolic Parameters After Weight Cycling in Male C57BL/6J Mice on High-Fat Diet
Single-group or control-group animal study in male C57BL/6J mice on a fixed high-fat diet, inducing weight cycling through controlled feeding regimens and measuring energy expenditure, respiratory exchange ratio, and energy balance at endpoint using indirect calorimetry.
In Vitro Assessment of Metabolic Rate and Substrate Utilization in Adipocytes and Myocytes After Simulated Weight Cycling in Male C57BL/6J Mouse Cells
Exposure of primary adipocytes and myocytes derived from male C57BL/6J mice to alternating high- and low-nutrient conditions mimicking weight cycling, measuring oxygen consumption rate, respiratory exchange ratio, and ATP production in vitro.