Cited by 284Diet and metabolism studiesDietary Effects on HealthNutritional Studies and Diet

Long-term effects of a very-low-carbohydrate weight loss diet compared with an isocaloric low-fat diet after 12 mo

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Brinkworth, Grant D, Noakes, Manny, Buckley, Jonathan D, Keogh, Jennifer B, Clifton, Peter M·2009·The American Journal of Clinical Nutrition

Abstract

BACKGROUND: Long-term weight loss and cardiometabolic effects of a very-low-carbohydrate, high-saturated-fat diet (LC) and a high-carbohydrate, low-fat diet (LF) have not been evaluated under isocaloric conditions. OBJECTIVE: The objective was to compare an energy-controlled LC diet with an LF diet at 1 y. DESIGN: Men and women (n = 118) with abdominal obesity and at least one additional metabolic syndrome risk factor were randomly assigned to either an energy-restricted (approximately 6-7 MJ) LC diet (4%, 35%, and 61% of energy as carbohydrate, protein, and fat, respectively) or an isocaloric LF diet (46%, 24%, and 30% of energy as carbohydrate, protein, and fat, respectively) for 1 y. Weight, body composition, and cardiometabolic risk markers were assessed. RESULTS: Sixty-nine participants (59%) completed the trial: 33 in the LC group and 36 in the LF group. Both groups lost similar amounts of weight (LC: -14.5 +/- 1.7 kg; LF: -11.5 +/- 1.2 kg; P = 0.14, time x diet) and body fat (LC: -11.3 +/- 1.5 kg; LF: -9.4 +/- 1.2 kg; P = 0.30). Blood pressure, fasting glucose, insulin, insulin resistance, and C-reactive protein decreased independently of diet composition. Compared with the LF group, the LC group had greater decreases in triglycerides (-0.36 +/- 0.15 mmol/L; 95% CI: -0.67, -0.05 mmol/L; P = 0.011), increases in HDL cholesterol (0.23 +/- 0.09 mmol/L; 95% CI: 0.06, 0.40 mmol/L; P = 0.018) and LDL cholesterol (0.6 +/- 0.2 mmol/L; 95% CI: 0.2, 1.0 mmol/L; P = 0.001), and a greater but nonsignificant increase in apolipoprotein B (0.08 +/- 0.04 g/L; 95% CI: -0.004, 0.171 g/L; P = 0.17). CONCLUSIONS: Under planned isoenergetic conditions, as expected, both dietary patterns resulted in similar weight loss and changes in body composition. The LC diet may offer clinical benefits to obese persons with insulin resistance. However, the increase in LDL cholesterol with the LC diet suggests that this measure should be monitored. This trial was registered with the Australian New Zealand Clinical Trials Registry at (http://www.anzctr.org.au) as ACTR 12606000203550.

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Authors
Brinkworth, G. D., Noakes, M., Buckley, J. D., Keogh, J. B., & Clifton, P. M.
Affiliations
  • Commonwealth Scientific and Industrial Research Organisation (AU)
  • University of South Australia (AU)
Corresponding author
Brinkworth, Grant D
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2009-07
Volume
90
Issue
1
Pages
23-32
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2142213167
Cited by
284
References
48
Citations by year
2026: 10 · 2025: 13 · 2024: 17 · 2023: 16 · 2022: 22 · 2021: 19 · 2020: 18 · 2019: 16 · 2018: 12 · 2017: 14 · 2016: 16 · 2015: 16 · 2014: 18 · 2013: 21 · 2012: 12
FWCI
12.41
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion, other-oa)
  • PubMed (publishedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
Funders
  • National Heart Foundation of Australia
  • University of South Australia
  • Medical Research Council
  • National Health and Medical Research Council
Topics
  • Health Sciences › Medicine › Physiology › Diet and metabolism studies
  • Health Sciences › Medicine › Physiology › Dietary Effects on Health
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutritional Studies and Diet
Keywords
very low carbohydrate diet, low-fat diet, weight loss, abdominal obesity, metabolic syndrome, cardiometabolic risk, body composition, insulin resistance, triglycerides, HDL cholesterol, LDL cholesterol, apolipoprotein B, C-reactive protein, blood pressure, fasting blood glucose, saturated fat, dietary fat composition
MeSH terms
Apolipoproteins B, Blood Pressure, Body Composition, Body Weight, C-Reactive Protein, Energy Intake, Female, Follow-Up Studies, Humans, Insulin, Lipids, Male, Obesity, Morbid, Patient Compliance, Surveys and Questionnaires, Weight Loss, Absorptiometry, Photon, Patient Selection, Diet, Fat-Restricted, Diet, Carbohydrate-Restricted

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