Macro partitioning
Adopting a Healthy Low-Fat (HLF) diet results in significantly higher total dietary fiber intake compared to a Healthy Low-Carbohydrate (HLC) diet over a 12-month period.
If you follow a low-fat diet, you will naturally consume more fiber (around 23g/day) because you can eat more grains and legumes. If you follow a low-carb diet, your fiber intake will be lower (around 18g/day) because you restrict grains and fruits, but you can still get adequate fiber by focusing on non-starchy vegetables, nuts, seeds, and avocados. The difference is modest, so low-carb diets are not fiber-deficient if focused on whole plant foods.
Significantly more total dietary fiber was consumed by HLF at every post-randomization time point, and, at 12 m, was 23.04 ± 9.43 g vs. 18.61 ± 8.12 g for HLF vs. HLC, respectively, p < 0.0001.
Why this rating
Randomized Controlled Trial (DIETFITS) with large sample size (n=609) and high retention, though self-reported dietary assessment is a limitation.
Source
Changes in Quantity and Sources of Dietary Fiber from Adopting Healthy Low-Fat vs. Healthy Low-Carb Weight Loss Diets: Secondary Analysis of DIETFITS Weight Loss Diet Study
Lisa Offringa et al. · Nutrients · 2021
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