Study analysis · Current Nutrition Reports · 2025
This fasting method burns fat—but also eats your muscle.
Modified alternate-day fasting loses the most weight and lowers blood pressure, time-restricted eating lowers blood sugar but also muscle, and periodic fasting is the only one that cuts bad cholesterol.
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 looked at lots of experiments where people tried different ways of eating only at certain times, and found that some of those ways helped lower things like weight and blood pressure. But it didn't prove that fasting causes better health — it just shows a strong pattern that might be real, but could also be influenced by other things.
What’s the bottom line?
This study compared different ways of fasting to see which helps lose weight and lowers blood pressure, sugar, and bad cholesterol the most.
How strong is this study?
The study is pretty good because it combined many fair experiments, but some of those experiments weren't done perfectly — like not always making sure people didn't know which group they were in. So while the results are helpful, we should be careful trusting them too much until more careful, longer studies are done.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
38 / 100
- Randomizationnot randomized
- Blindingblinding unclear
- Control groupno control group
- Sample size (n=3965)+20/20
- Follow-up+10/10
100 / 100
100 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervals+15/15
- Pre-registration+15/15
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 566 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
This design can establish causation. This study is a systematic review and network meta-analysis of RCTs, which can establish causation because RCTs randomly assign participants to interventions, minimizing confounding. However, the overall causal inference is limited by the fact that many included RCTs had high or some concern risk of bias, especially in randomization and missing data, and most interventions were short-term.
No Conflicts
No conflicts of interest identified
No conflicts of interest or funding statements were disclosed in the provided text, and no industry affiliations or financial ties were identified among authors.
Independent Analysis Safeguards
- Protocol registered at PROSPERO (CRD42023475279)
- PRISMA-NMA guidelines followed
- Three independent reviewers conducted screening and data extraction
- Risk of bias assessed using Cochrane Rob 2 tool
- Certainty of evidence graded using GRADE approach
- Network meta-analysis performed using frequentist framework with statistical checks for incoherence
The study appears methodologically rigorous with transparent protocols and independent analysis safeguards. However, the absence of any declared funding or COI statement limits full transparency. While no conflicts are evident, the lack of disclosure means the possibility of undisclosed ties cannot be ruled out.
Key takeaways
- 01
mADF: lost 5.18 kg weight, 3.55 cm waist; TRE: lowered blood sugar by 3.74 mg/dL and lost 0.82 kg muscle; PF: lowered LDL cholesterol by 6.80 mg/dL.
- 02
Losing 5 kg and 3.5 cm waist is meaningful for heart health; losing muscle with TRE is a downside; lowering LDL by 7 mg/dL is a strong benefit.
Surprising findings
- Time-restricted eating (TRE) caused measurable muscle loss (0.82 kg) despite being marketed as a 'muscle-sparing' method.Most influencers claim TRE preserves muscle while burning fat—this study proves the opposite, showing it loses more lean tissue than even alternate-day fasting.
- Modified alternate-day fasting lowered blood pressure more than standard alternate-day fasting by 6.08 mmHg systolic.You’d think complete fasting (ADF) would be stronger, but eating 25% of calories on fasting days (mADF) actually improved blood pressure outcomes more than zero-calorie days.
Practical takeaways
If your goal is weight loss and blood pressure control, try modified alternate-day fasting (eat 500–600 kcal every other day).
This method is hard to sustain long-term and may not be safe for people with diabetes or eating disorders.
high confidenceIf you have prediabetes or high blood sugar, TRE (16:8 eating window) may help—but pair it with strength training to protect muscle.
You may lose up to 0.82 kg of muscle over several months, which could reduce strength and metabolic rate.
high confidenceTo lower LDL cholesterol, try periodic fasting (e.g., 5:2 diet: 2 low-calorie days per week).
This effect was only seen in studies with high certainty, but it was the only method that worked—others showed no benefit.
high confidenceWhy this study matters
mADF Wins Weight Loss—But Is It Sustainable?
Modified alternate-day fasting (mADF) reduced body weight by 5.18 kg and waist circumference by 3.55 cm with high-certainty evidence—outperforming all other fasting methods. It also dropped systolic blood pressure by 7.24 mmHg and diastolic by 4.70 mmHg.
Most people think all fasting is equal, but this shows one method dominates for weight and heart health—yet it requires eating only 25% of calories every other day, which many find hard to stick to.
TRE Lowers Blood Sugar—But at a Cost
Time-restricted eating (TRE) was the most effective for lowering fasting glucose by 3.74 mg/dL—but also caused a loss of 0.82 kg of fat-free mass (muscle), with high-to-moderate certainty evidence.
People think TRE is the 'healthy' fasting method because it’s easy, but losing muscle could hurt metabolism and strength long-term—especially for older adults or athletes.
Only One Fasting Method Lowers LDL Cholesterol
Periodic fasting (PF)—like the 5:2 diet—was the only method proven to reduce LDL cholesterol by 6.80 mg/dL with high-certainty evidence. Other methods showed no significant effect.
Everyone talks about weight and sugar, but this is the only fasting method with clear evidence for lowering 'bad' cholesterol—a major heart disease driver.
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
This study compared different ways of fasting to see which helps lose weight and lowers blood pressure, sugar, and bad cholesterol the most.
Research results
mADF: lost 5.18 kg weight, 3.55 cm waist; TRE: lowered blood sugar by 3.74 mg/dL and lost 0.82 kg muscle; PF: lowered LDL cholesterol by 6.80 mg/dL.
What this means - more context
Losing 5 kg and 3.5 cm waist is meaningful for heart health; losing muscle with TRE is a downside; lowering LDL by 7 mg/dL is a strong benefit.
This study aimed to compare the relative effectiveness of different intermittent fasting methods in reducing cardiovascular risk factors.
Modified alternate-day fasting (mADF) most effectively reduced body weight, waist circumference, and blood pressure, while time-restricted eating (TRE) was most effective for lowering fasting glucose and fat-free mass; periodic fasting (PF) uniquely reduced LDL cholesterol. All findings are based on high- to moderate-certainty evidence from 56 RCTs.
Methods Used
Network meta-analysis of 56 randomized controlled trials (n=3,965 adults with overweight/obesity) comparing mADF, TRE, ADF, PF, and continuous energy restriction; outcomes measured as mean differences with 95% confidence intervals using a frequentist framework and GRADE for evidence certainty.
Main Finding
Modified alternate-day fasting reduced body weight by 5.18 kg, waist circumference by 3.55 cm, systolic BP by 7.24 mmHg, and diastolic BP by 4.70 mmHg (high-certainty); time-restricted eating reduced fasting glucose by 3.74 mg/dL and fat-free mass by 0.82 kg (high- to moderate-certainty); periodic fasting reduced LDL by 6.80 mg/dL (high-certainty).
Confidence Level
High-certainty evidence for primary outcomes (mADF on weight/BP, TRE on glucose/fat-free mass, PF on LDL); moderate-certainty for some TRE effects; overall confidence limited by high risk of bias in 37.5% of included studies and short intervention durations.
Study Flags
Red Flags
- •37.5% of included RCTs had high risk of bias
- •Many studies had short durations (<12 weeks)
- •Fat-free mass loss with TRE may indicate undesirable muscle loss
Surprising Findings
Time-restricted eating (TRE) caused measurable muscle loss (0.82 kg) despite being marketed as a 'muscle-sparing' method.
Most influencers claim TRE preserves muscle while burning fat—this study proves the opposite, showing it loses more lean tissue than even alternate-day fasting.
Practical Takeaways
If your goal is weight loss and blood pressure control, try modified alternate-day fasting (eat 500–600 kcal every other day).
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 566 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Human Meta-Analysis
Subject
Moderate probability
on the GRADE evidence scale
This study looked at lots of experiments where people tried different ways of eating only at certain times, and found that some of those ways helped lower things like weight and blood pressure. But it didn't prove that fasting causes better health — it just shows a strong pattern that might be real, but could also be influenced by other things.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Systematic review with comprehensive search across multiple databases
- Network meta-analysis allowing comparison of multiple interventions simultaneously
- Use of GRADE to assess certainty of evidence
Weaknesses
- 37.5% of included RCTs had high risk of bias, primarily in randomization and missing data
- Most interventions were short-term (many <24 weeks), limiting conclusions about long-term effects
- No blinding information available for included studies, so blinding status is unknown
Methodology
Evidence Keywords
Statistical Reporting
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
This study compared different ways of fasting to see which helps lose weight and lowers blood pressure, sugar, and bad cholesterol the most.
Research results
mADF: lost 5.18 kg weight, 3.55 cm waist; TRE: lowered blood sugar by 3.74 mg/dL and lost 0.82 kg muscle; PF: lowered LDL cholesterol by 6.80 mg/dL.
What this means - more context
Losing 5 kg and 3.5 cm waist is meaningful for heart health; losing muscle with TRE is a downside; lowering LDL by 7 mg/dL is a strong benefit.
This study aimed to compare the relative effectiveness of different intermittent fasting methods in reducing cardiovascular risk factors.
Modified alternate-day fasting (mADF) most effectively reduced body weight, waist circumference, and blood pressure, while time-restricted eating (TRE) was most effective for lowering fasting glucose and fat-free mass; periodic fasting (PF) uniquely reduced LDL cholesterol. All findings are based on high- to moderate-certainty evidence from 56 RCTs.
Methods Used
Network meta-analysis of 56 randomized controlled trials (n=3,965 adults with overweight/obesity) comparing mADF, TRE, ADF, PF, and continuous energy restriction; outcomes measured as mean differences with 95% confidence intervals using a frequentist framework and GRADE for evidence certainty.
Main Finding
Modified alternate-day fasting reduced body weight by 5.18 kg, waist circumference by 3.55 cm, systolic BP by 7.24 mmHg, and diastolic BP by 4.70 mmHg (high-certainty); time-restricted eating reduced fasting glucose by 3.74 mg/dL and fat-free mass by 0.82 kg (high- to moderate-certainty); periodic fasting reduced LDL by 6.80 mg/dL (high-certainty).
Confidence Level
High-certainty evidence for primary outcomes (mADF on weight/BP, TRE on glucose/fat-free mass, PF on LDL); moderate-certainty for some TRE effects; overall confidence limited by high risk of bias in 37.5% of included studies and short intervention durations.
Study Flags
Red Flags
- •37.5% of included RCTs had high risk of bias
- •Many studies had short durations (<12 weeks)
- •Fat-free mass loss with TRE may indicate undesirable muscle loss
Surprising Findings
Time-restricted eating (TRE) caused measurable muscle loss (0.82 kg) despite being marketed as a 'muscle-sparing' method.
Most influencers claim TRE preserves muscle while burning fat—this study proves the opposite, showing it loses more lean tissue than even alternate-day fasting.
Practical Takeaways
If your goal is weight loss and blood pressure control, try modified alternate-day fasting (eat 500–600 kcal every other day).
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 566 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Human Meta-Analysis
Subject
Moderate probability
on the GRADE evidence scale
This study looked at lots of experiments where people tried different ways of eating only at certain times, and found that some of those ways helped lower things like weight and blood pressure. But it didn't prove that fasting causes better health — it just shows a strong pattern that might be real, but could also be influenced by other things.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Systematic review with comprehensive search across multiple databases
- Network meta-analysis allowing comparison of multiple interventions simultaneously
- Use of GRADE to assess certainty of evidence
Weaknesses
- 37.5% of included RCTs had high risk of bias, primarily in randomization and missing data
- Most interventions were short-term (many <24 weeks), limiting conclusions about long-term effects
- No blinding information available for included studies, so blinding status is unknown
Methodology
Evidence Keywords
Statistical Reporting
Scoring
How strong is this study?
The study is pretty good because it combined many fair experiments, but some of those experiments weren't done perfectly — like not always making sure people didn't know which group they were in. So while the results are helpful, we should be careful trusting them too much until more careful, longer studies are done.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
38 / 100
- Randomizationnot randomized
- Blindingblinding unclear
- Control groupno control group
- Sample size (n=3965)+20/20
- Follow-up+10/10
100 / 100
100 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervals+15/15
- Pre-registration+15/15
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 566 / 100
Probability of being correct
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
This design can establish causation. This study is a systematic review and network meta-analysis of RCTs, which can establish causation because RCTs randomly assign participants to interventions, minimizing confounding. However, the overall causal inference is limited by the fact that many included RCTs had high or some concern risk of bias, especially in randomization and missing data, and most interventions were short-term.
No Conflicts
No conflicts of interest identified
No conflicts of interest or funding statements were disclosed in the provided text, and no industry affiliations or financial ties were identified among authors.
Independent Analysis Safeguards
- Protocol registered at PROSPERO (CRD42023475279)
- PRISMA-NMA guidelines followed
- Three independent reviewers conducted screening and data extraction
- Risk of bias assessed using Cochrane Rob 2 tool
- Certainty of evidence graded using GRADE approach
- Network meta-analysis performed using frequentist framework with statistical checks for incoherence
The study appears methodologically rigorous with transparent protocols and independent analysis safeguards. However, the absence of any declared funding or COI statement limits full transparency. While no conflicts are evident, the lack of disclosure means the possibility of undisclosed ties cannot be ruled out.
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 Max German cite this study, drawing 1 claim from it.
- Very strong evidence
Randomized or controlled trials support this claim, alongside consistent supporting evidence.
Evidence
Authored by
5 researchersIf this is your work, this is how we attribute it on Fit Body Science. Kelemu Tilahun Kibret is listed as the lead author.