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).
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
More from this paper
- There is insufficient evidence to recommend low-carbohydrate diets for use longer than 90 days, for participants older than 50 years, or for diets providing 20 g/d or less of carbohydrates.Good
- Low-carbohydrate diets (≤60 g/d) do not have a significant adverse effect on serum lipid profiles, fasting serum glucose, fasting serum insulin levels, or blood pressure compared to higher-carbohydrate diets.Moderate
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