Research

Energy balance

Low-carbohydrate diets (≤60 g/d) produce greater short-term weight loss than higher-carbohydrate diets, but this effect is driven by reduced caloric intake and longer diet duration rather than carbohydrate restriction itself.

If you choose a low-carbohydrate diet (under 60g carbs/day), expect significant weight loss, but understand it is likely because you are eating fewer calories overall, not because of the carb restriction itself. The diet is not superior to other diets if calorie intake and duration are matched. Be aware that evidence for long-term use (>90 days) or in older adults (>50 years) is insufficient.

ModerateQualifiesMEDIUM confidence
Among obese patients, weight loss was associated with longer diet duration (P=.002), restriction of calorie intake (P=.03), but not with reduced carbohydrate content (P=.90).
Dena M Bravata et al. · JAMA · 2003

Why this rating

Meta-analysis of heterogeneous studies; significant heterogeneity noted.

Source

Efficacy and Safety of Low-Carbohydrate Diets

Dena M Bravata et al. · JAMA · 2003

DOI 10.1001/jama.289.14.1837

Meta-analysis · 94 studiesCited 563×
Read the paper
DOI resolved against Crossref · corpus check 2026-06-10

This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →