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A Palaeolithic-type diet causes strong tissue-specific effects on ectopic fat deposition in obese postmenopausal women
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin.
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Yrkes- och miljömedicin.
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin.
Visa övriga samt affilieringar
2013 (Engelska)Ingår i: Journal of Internal Medicine, ISSN 0954-6820, E-ISSN 1365-2796, Vol. 274, nr 1, s. 67-76Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

OBJECTIVES: Ectopic fat accumulation in liver and skeletal muscle may be an essential link between abdominal obesity, insulin resistance and increased risk of cardiovascular disease after menopause. We hypothesized that a diet containing a relatively high content of protein and unsaturated fat [mainly monounsaturated fatty acids (MUFAs)] but limited carbohydrates and saturated fat would reduce lipid content in liver and muscle and increase insulin sensitivity in postmenopausal women.

SUBJECTS: Ten healthy, nonsmoking postmenopausal women with a body mass index (BMI) >27 (28-35) kg m-2 were included in the study.

INTERVENTIONS: Participants were instructed to consume an ad libitum Palaeolithic-type diet intended to provide approximately 30 energy percentage (E%) protein, 40 E% fat (mainly MUFAs) and 30 E% carbohydrate. Intramyocellular lipid (IMCL) levels in calf muscles and liver triglyceride levels were quantified using proton magnetic resonance spectroscopy (1 H-MRS) before and 5 weeks after dietary intervention. Insulin sensitivity was estimated by homoeostasis model assessment (HOMA) indices and the euglycaemic hyperinsulinaemic clamp technique.

RESULTS: Mean energy intake decreased by 25% with a weight loss of 4.5 kg. BMI, waist and hip circumference, waist/hip ratio and abdominal sagittal diameter also decreased significantly, as did diastolic blood pressure (mean -7 mmHg), levels of fasting serum glucose, cholesterol, triglycerides, LDL/HDL cholesterol, apolipoprotein B (ApoB) and apolipoprotein A1 (ApoA1), urinary C-peptide and HOMA indices. Whole-body insulin sensitivity did not change. Liver triglyceride levels decreased by 49%, whereas IMCL levels in skeletal muscle were not significantly altered.

CONCLUSIONS: A modified Palaeolithic-type diet has strong and tissue-specific effects on ectopic lipid deposition in postmenopausal women.

Ort, förlag, år, upplaga, sidor
Wiley-Blackwell, 2013. Vol. 274, nr 1, s. 67-76
Nyckelord [en]
adipose tissue, diet, fatty liver, insulin resistance, postmenopausal, weight
Nationell ämneskategori
Arbetsmedicin och miljömedicin Näringslära
Forskningsämne
Kostvetenskap
Identifikatorer
URN: urn:nbn:se:umu:diva-67135DOI: 10.1111/joim.12048ISI: 000320279000005PubMedID: 23414424OAI: oai:DiVA.org:umu-67135DiVA, id: diva2:611039
Tillgänglig från: 2013-03-14 Skapad: 2013-03-14 Senast uppdaterad: 2018-06-08Bibliografiskt granskad
Ingår i avhandling
1. Effects of diet intervention on body composition and ectopic fat accumulation in obese postmenopausal women
Öppna denna publikation i ny flik eller fönster >>Effects of diet intervention on body composition and ectopic fat accumulation in obese postmenopausal women
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Background Obesity is increasing worldwide and is a major contributor to morbidity and mortality. Notably, abdominal (central) obesity carries a high risk of obesity-related diseases, while peripheral fat accumulation can act in a protective manner. A redistribution of fat from peripheral to central depots is seen after the menopause and is associated with an increasing prevalence of diabetes and cardiovascular disease. A key mediator may be ectopic fat accumulation in the liver. Our hypothesis was that a Palaeolithic-type diet (PD) consumed ad libitum improves body composition and metabolic risk markers, including liver fat and insulin sensitivity, in obese postmenopausal women.

Methods In study I the study subjects (n=10) used a PD during 5 weeks. In study II and III (n=70) the effect of a Palaeolithic-type diet (PD) was compared to a diet according to the Nordic Nutrition Recommendations diet (NNR) during a 2-year randomized clinical trial (RCT). Food records and nitrogen excretion in urine validated food intake. Anthropometric measurements were performed in a standardized manner. Body composition was calculated using Dual Energy X-ray Absorptiometry (DXA). Total energy expenditure was calculated by accelerometry (Actiheart®) in combination with indirect calorimetry. Liver and muscle fat content was estimated by magnet resonance spectroscopy (1H-MRS). Insulin sensitivity was measured either with hyperinsulinemic euglycemic clamps (paper I) or oral glucose tolerance tests (OGTTs) (paper III).

Results In study I a significant weight loss, linked to improved lipid and blood pressure levels, was associated with a 49% decrease in liver fat. Concomitantly, hepatic insulin sensitivity improved, while peripheral insulin sensitivity (and muscle fat) was unaltered. In study II/III both groups had a significant and sustained weight loss after 2 years. The PD was more effective than the NNR diet regarding loss of weight and fat mass after 6 months, but not after 24 months. Serum triglyceride levels were significantly lower at 24 months in the PD group. Liver fat decreased throughout the study in both groups. Hepatic insulin sensitivity improved during the first 6 months of the study, while peripheral insulin sensitivity did not change. Hepatic insulin sensitivity was associated with liver fat at baseline, but not during the diet intervention. Energy expenditure did not change in any of the study groups.

Conclusion Ad libitum diets can have sustained beneficial effects on weight and body composition in obese postmenopausal women, a PD being more effective on short-term than a diet according to the NNR. This is associated with a reduction in liver fat that may reduce the risk of future diabetes and cardiovascular disease. Further studies are needed in order to explore the association between liver fat and metabolic dysfunction, including insulin sensitivity.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå universitet, 2014. s. 45
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 1682
Nyckelord
obesity, diet intervention, postmenopausal, ectopic fat
Nationell ämneskategori
Klinisk medicin
Forskningsämne
medicin
Identifikatorer
urn:nbn:se:umu:diva-95161 (URN)978-91-7601-159-1 (ISBN)
Disputation
2014-11-14, Hörsal B, byggnad 1D, Umeå universitet, Umeå, 13:00 (Svenska)
Opponent
Handledare
Tillgänglig från: 2014-10-24 Skapad: 2014-10-23 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Ryberg, MatsSandberg, SusanneMellberg, CarolineLindahl, BerntLarsson, ChristelHauksson, JonOlsson, Tommy

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