Dietary fiber and body weight.
Level 5 - mechanism / opinion, no new human data
Narrative literature review without systematic review methodology or meta-analysis.
PubMed 15797686 · doi:10.1016/j.nut.2004.08.018
What was done
The authors reviewed published human epidemiologic and intervention studies evaluating the relationship between dietary fiber and body weight or weight maintenance, calculated fiber content in selected low-carbohydrate diets, and summarized proposed physiological mechanisms.
What was found
The abstract reports no numerical effect sizes or statistical values. It states that epidemiologic evidence strongly shows an inverse relationship between dietary fiber intake and body weight, body fat, and body mass index across all levels of fat intake after adjusting for confounders. Intervention studies yielded mixed findings, though supplemental or dietary fiber generally reduced food intake and body weight. Average adult fiber intake in the United States was noted to be less than half of recommended levels, with even lower amounts in popular low-carbohydrate diets.
Why it matters
It consolidates evidence on dietary fiber as an accessible dietary component for weight control and identifies low-carbohydrate regimens as prone to fiber deficiency.
Limits
As a narrative review, it lacks a documented systematic search protocol, quality scoring, or meta-analytic quantification. No exact sample sizes, trial durations, fiber types, or quantitative outcome measures are provided in the abstract.
Cited by
- supports The recommended daily intake of dietary fiber is approximately 30 grams, but most people only consume around 12 to 15 grams per day.