The Claim

A network meta-analysis of 24 randomized trials found that alternate day fasting has a 57% probability of being the most effective intermittent fasting regimen for weight loss, followed by calorie restriction at 38% and time-restricted eating at 8%, with no statistically significant direct comparisons between these regimens.

Source: A meta‐analysis comparing the effectiveness of alternate day fasting, the 5:2 diet, and time‐restricted eating for weight loss

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
67score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

Among three popular intermittent fasting methods, alternate day fasting was ranked most likely to lead to weight loss based on a statistical analysis of 24 trials, followed by calorie restriction and then time-restricted eating, though no two methods were directly compared with statistically significant results.

See the scientific wording

Network meta-analysis of 24 randomized trials suggests alternate day fasting has the highest probability (57%) of ranking as the most effective intermittent fasting regimen for weight loss, followed by calorie restriction (38%) and time-restricted eating (8%), though no direct comparisons between these regimens reached statistical significance.

Why this might work

When a person alternates between eating and not eating, the body switches from storing food as fat to burning fat for energy. During fasting, stored fat is broken down and used to make fuel, which reduces overall fat levels in the body and leads to weight loss.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: A meta‐analysis comparing the effectiveness of alternate day fasting, the 5:2 diet, and time‐restricted eating for weight loss

    This study looked at different ways people try to lose weight by eating less, and found that skipping meals every other day (alternate day fasting) seemed to work best on average—but since no one directly compared them head-to-head, we can’t say for sure it’s the best. The numbers match what the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.