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Benefits of a Paleolithic diet with and without supervised exercise on fat mass, insulin sensitivity, and glycemic control: a randomized controlled trial in individuals with type 2 diabetes
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin. (Tommy Olsson)ORCID-id: 0000-0001-9016-1139
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Medicin.
Umeå universitet, Samhällsvetenskapliga fakulteten, Institutionen för kostvetenskap.ORCID-id: 0000-0001-9743-8567
Umeå universitet, Medicinska fakulteten, Institutionen för samhällsmedicin och rehabilitering, Idrottsmedicin.
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2017 (Engelska)Ingår i: Diabetes/Metabolism Research Reviews, ISSN 1520-7552, E-ISSN 1520-7560, Vol. 33, nr 1, artikel-id e2828Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background

Means to reduce future risk for cardiovascular disease in subjects with type 2 diabetes are urgently needed.

Methods

Thirty-two patients with type 2 diabetes (age 59 ± 8 years) followed a Paleolithic diet for 12 weeks. Participants were randomized to either standard care exercise recommendations (PD) or 1-h supervised exercise sessions (aerobic exercise and resistance training) three times per week (PD-EX).

Results

For the within group analyses, fat mass decreased by 5.7 kg (IQR: −6.6, −4.1; p < 0.001) in the PD group and by 6.7 kg (−8.2, −5.3; p < 0.001) in the PD-EX group. Insulin sensitivity (HOMA-IR) improved by 45% in the PD (p < 0.001) and PD-EX (p < 0.001) groups. HbA1c decreased by 0.9% (−1.2, −0.6; p < 0.001) in the PD group and 1.1% (−1.7, −0.7; p < 0.01) in the PD-EX group. Leptin decreased by 62% (p < 0.001) in the PD group and 42% (p < 0.001) in the PD-EX group. Maximum oxygen uptake increased by 0.2 L/min (0.0, 0.3) in the PD-EX group, and remained unchanged in the PD group (p < 0.01 for the difference between intervention groups). Male participants decreased lean mass by 2.6 kg (−3.6, −1.3) in the PD group and by 1.2 kg (−1.3, 1.0) in the PD-EX group (p < 0.05 for the difference between intervention groups).

Conclusions

A Paleolithic diet improves fat mass and metabolic balance including insulin sensitivity, glycemic control, and leptin in subjects with type 2 diabetes. Supervised exercise training may not enhance the effects on these outcomes, but preserves lean mass in men and increases cardiovascular fitness.

Ort, förlag, år, upplaga, sidor
2017. Vol. 33, nr 1, artikel-id e2828
Nyckelord [en]
type 2 diabetes, Paleolithic diet, diet intervention, exercise, glycosyl-ated haemoglobin A, insulin sensitivity, leptin
Nationell ämneskategori
Endokrinologi och diabetes
Identifikatorer
URN: urn:nbn:se:umu:diva-126188DOI: 10.1002/dmrr.2828ISI: 000397102800010OAI: oai:DiVA.org:umu-126188DiVA, id: diva2:1010242
Tillgänglig från: 2016-10-03 Skapad: 2016-10-03 Senast uppdaterad: 2019-03-14Bibliografiskt granskad
Ingår i avhandling
1. Effects of a Paleolithic diet and exercise on liver fat, muscle fat and insulin sensitivity
Öppna denna publikation i ny flik eller fönster >>Effects of a Paleolithic diet and exercise on liver fat, muscle fat and insulin sensitivity
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Finding ways to reduce risk for obesity-related disorders, including type 2 diabetes and cardiovascular disease, is important. Such approaches can include lifestyle interventions by diet and exercise. Our ancestors in the Paleolithic Era ate a diet based on vegetables, fruit, berries, lean meat, fish, seafood, nuts and eggs. Cereals, dairy products and legumes were not a significant part of the diet before the agricultural revolution, and neither were added sugar or salt. Furthermore, our ancestors were much more physically active compared to the average Western population.

Contemporary hunter-gatherers like the Kitava Islanders and the Greenlandic Inuit eat a diet similar to that of the Paleolithic Era and have a strikingly low frequency of cardiovascular events. Detailed studies of the metabolic effects of the Paleolithic diet, with and without exercise, are therefore warranted.

Impaired insulin sensitivity is a key factor in the development of type 2 diabetes and cardiovascular disease. In this thesis, insulin sensitivity was measured with the gold-standard examination – the hyperinsulinemic– euglycemic clamp – and also with fasting blood samples and the oral glucose tolerance test. We found the fasting index Revised QUICKI to be the best choice if the time-consuming gold-standard examination is not feasible. However, to distinguish insulin sensitivity of different tissues like skeletal muscle, liver and adipose tissue, the hyperinsulinemic–euglycemic clamp is preferred.

In our studies, the Paleolithic diet improved cardiovascular risk factors like overweight, insulin sensitivity, liver fat, triglycerides and blood pressure in obese, postmenopausal women. All study participants decreased liver fat when eating a Paleolithic diet. Six months of Paleolithic diet improved weight, liver fat and triglycerides significantly more than a conventional low-fat diet in obese, postmenopausal women. It was difficult for the women to remain adherent to the Paleolithic diet for 2 years, however, and most cardiovascular risk factors showed some degree of deterioration between 6 and 24 months. In individuals with type 2 diabetes, a Paleolithic diet for 12 weeks improved weight, insulin sensitivity, HbA1c, triglycerides and blood pressure. Exercise training did not improve these cardiovascular risk factors beyond the changes observed with the Paleolithic diet alone. The 12-week Paleolithic diet intervention also reduced muscle fat and liver fat, but exercise training reversed this effect.

A Paleolithic diet has strong effects on fat content in liver and muscle and on insulin sensitivity. Our present results indicate reduced metabolic flexibility in the fat content in liver and muscle tissue among patient with type 2 diabetes, which may improve through diet and exercise intervention. 

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2016. s. 73
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 1839
Nyckelord
type 2 diabetes, liver fat, Paleolithic diet, exercise training, insulin sensitivity, overweight, intramyocellular lipid content
Nationell ämneskategori
Endokrinologi och diabetes
Identifikatorer
urn:nbn:se:umu:diva-126189 (URN)978-91-7601-548-3 (ISBN)
Disputation
2016-10-28, Hörsal 933, trapphus B, Norrlands universitetssjukhus, Umeå, 09:00 (Svenska)
Opponent
Handledare
Tillgänglig från: 2016-10-07 Skapad: 2016-10-03 Senast uppdaterad: 2018-08-27Bibliografiskt granskad

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Otten, JuliaStomby, AndreasWaling, MariaIsaksson, AndreasTellström, AnnaLundin-Olsson, LillemorRyberg, MatsSvensson, MichaelOlsson, Tommy

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