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A Low-Carbohydrate as Compared with a Low-Fat Diet in Severe Obesity
Open accessAbstract
BACKGROUND: The effects of a carbohydrate-restricted diet on weight loss and risk factors for atherosclerosis have been incompletely assessed. METHODS: We randomly assigned 132 severely obese subjects (including 77 blacks and 23 women) with a mean body-mass index of 43 and a high prevalence of diabetes (39 percent) or the metabolic syndrome (43 percent) to a carbohydrate-restricted (low-carbohydrate) diet or a calorie- and fat-restricted (low-fat) diet. RESULTS: Seventy-nine subjects completed the six-month study. An analysis including all subjects, with the last observation carried forward for those who dropped out, showed that subjects on the low-carbohydrate diet lost more weight than those on the low-fat diet (mean [+/-SD], -5.8+/-8.6 kg vs. -1.9+/-4.2 kg; P=0.002) and had greater decreases in triglyceride levels (mean, -20+/-43 percent vs. -4+/-31 percent; P=0.001), irrespective of the use or nonuse of hypoglycemic or lipid-lowering medications. Insulin sensitivity, measured only in subjects without diabetes, also improved more among subjects on the low-carbohydrate diet (6+/-9 percent vs. -3+/-8 percent, P=0.01). The amount of weight lost (P<0.001) and assignment to the low-carbohydrate diet (P=0.01) were independent predictors of improvement in triglyceride levels and insulin sensitivity. CONCLUSIONS: Severely obese subjects with a high prevalence of diabetes or the metabolic syndrome lost more weight during six months on a carbohydrate-restricted diet than on a calorie- and fat-restricted diet, with a relative improvement in insulin sensitivity and triglyceride levels, even after adjustment for the amount of weight lost. This finding should be interpreted with caution, given the small magnitude of overall and between-group differences in weight loss in these markedly obese subjects and the short duration of the study. Future studies evaluating long-term cardiovascular outcomes are needed before a carbohydrate-restricted diet can be endorsed.
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In the citing paper
“We did not confirm previous findings that low-carbohydrate or high-protein diets caused increased weight loss at 6 months3–12 and that the advantage of these diets usually eroded by 12 months, with weight loss that was nearly or fully equivalent to that with low-fat diets6,11,18 or other diets.12”
From Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates (2009) · cites this paper as [7]
Experimental — accuracy not yet measuredThe cited source says what the claim attributes to it.
In the citing paper
“Nevertheless, low-carbohydrate, high-fat diets may lead to spontaneous reduction in calorie reduction and increased weight loss, especially over the short term50–52.”
From Maintenance of Lost Weight and Long-Term Management of Obesity (2018) · cites this paper as [52]
Experimental — accuracy not yet measuredThe cited source says what the claim attributes to it.
In the citing paper
“Several trials showed that low-carbohydrate, high-protein diets resulted in more weight loss over the course of 3 to 6 months than conventional high-carbohydrate, low-fat diets,4–12 but other studies did not show this effect.13–17”
From Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates (2009) · cites this paper as [7]
In the citing paper
“Significant reductions in fat mass including truncal fat, which is a marker for visceral obesity, have been demonstrated in many studies [9,11,26,29].”
From The case for low carbohydrate diets in diabetes management (2005) · cites this paper as [11]
In the citing paper
“It is interesting that despite advocating ad libitum fat and protein intake, a LoCHO diet may be hypocaloric either by design or by spontaneous reduction of intake [8-12].”
From The case for low carbohydrate diets in diabetes management (2005) · cites this paper as [11]
In the citing paper
“There are several other reports indicating metabolic advantage in low carbohydrate diets over short term (3–6 months) [8,10,11,26-28].”
From The case for low carbohydrate diets in diabetes management (2005) · cites this paper as [11]
In the citing paper
“Conversely, LoCHO diets have been consistently demonstrated to lower triglycerides and increase HDL [8-11,26-28].”
From The case for low carbohydrate diets in diabetes management (2005) · cites this paper as [11]
In the citing paper
“LoCHO diets have been reported to reduce fat mass including truncal fat over long term in many studies [11,21,26,29].”
From The case for low carbohydrate diets in diabetes management (2005) · cites this paper as [11]
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Cites
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Flagged first, then by citations
1 of the 20 references couldn’t be matched to a known paper.
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- Westman EC, 1999, J Clin Outcomes Manage, 6, 36
- 10.1210/jc.85.7.2402 · DOI · Paper page
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Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates
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“1 mo 501 (308-686)† 198 (154-317)‡ 184 (134-237)† 82 (18-324)† .”
Mente, A., de Koning, L., Shannon, H. S., & Anand, S. S. (2009) · Archives of Internal Medicine · doi:10.1001/archinternmed.2009.38 · Cited by 1,267
Metadata
- Authors
- Samaha, F. F., Iqbal, N., Seshadri, P., Chicano, K. L., Daily, D. A., McGrory, J., Williams, T., Williams, M., Gracely, E. J., & Stern, L.
- Affiliations
- Veterans Health Administration (US)
- University of Pennsylvania (US)
- Drexel University (US)
- ORCID
- Gracely, Edward J.
- Venue
- New England Journal of Medicine
- Publisher
- Massachusetts Medical Society
- Published
- 2003-05-22
- Volume
- 348
- Issue
- 21
- Pages
- 2074-2081
- ISSN
- 0028-4793 (ISSN-L)
- 1533-4406
- OpenAlex
- W2154184102
- Semantic Scholar
- b42feb4332c5988f5d769f116b2b96ffdfc37bd4
- Cited by
- 1,267
- References
- 20
- Citations by year
- 2026: 9 · 2025: 17 · 2024: 26 · 2023: 24 · 2022: 39 · 2021: 38 · 2020: 58 · 2019: 33 · 2018: 36 · 2017: 36 · 2016: 43 · 2015: 28 · 2014: 37 · 2013: 46 · 2012: 62
- FWCI
- 70.68
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- New England Journal of Medicine (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology (medical) › Diet and metabolism studies
- Health Sciences › Medicine › Physiology (medical) › Dietary Effects on Health
- Health Sciences › Medicine › Surgery › Bariatric Surgery and Outcomes
- Keywords
- low-carbohydrate diet, low-fat diet, morbid obesity, weight loss, triglycerides, insulin sensitivity, diabetes mellitus, metabolic syndrome, atherosclerosis risk factors, dietary intervention
- MeSH terms
- Arteriosclerosis, Blood Glucose, Diabetes Mellitus, Diet, Reducing, Dietary Carbohydrates, Female, Humans, Insulin Resistance, Lipids, Male, Middle Aged, Obesity, Risk Factors, Triglycerides, Weight Loss, Body Mass Index, Diet, Fat-Restricted, Metabolic Syndrome
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