Abstract The micronutrient adequacy of common fad diets is rarely assessed. We compared a high‐fiber diet [HF] with a low‐carbohydrate diet [LC] to assess their effects on body weight and micronutrient adequacy. One hundred and seventy‐three adult males and females with or without diabetes with a mean body mass index of 36 kg/m2 were randomized to either a HF or LC diet. Differences in anthropometrics, blood lipids, glucose, blood pressure, and micronutrient consumption between groups were assessed after 52 weeks. Differences between groups a priori were assessed using independent t tests and chi‐squared tests. Post hoc differences in nutrient consumption between groups while controlling for gender were assessed using factorial analysis of variance. After 52 weeks, LC dieters (n = 24) retained weight loss better than their HF counterparts (n = 30) (p = .06). LC dieters consumed more vitamin K (mcg) [HF = 124.0 ± 15.0; LC = 220.0 ± 39.1; p = .025] and vitamin B12 (mcg) [HF = 3.1 ± 0.3; LC = 4.1 ± 0.4; p = .026]. The HF group consumed more folate (mcg) [HF = 479.9 ± 34.0); LC = 333.8 ± 22.1; p
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