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The investigators will conduct an open label, experimental medicine study exploring the diurnal patterns of hepatic lipid metabolism in NAFLD and non-NAFLD participants (determined by Transient elastography (TE) with controlled attenuation parameter (CAP)). We will also determine whether the diurnal patterns of lipid metabolism in NAFLD participants can be modified using lifestyle and weight loss intervention. Fourteen participants without NAFLD will have morning and evening metabolic investigations (visit 1M & 1E) to assess for changes in lipid flux pathways across the course of the day. After morning and evening investigations their involvement in the clinical study will then end. Seventeen NAFLD participants will also have identical baseline morning and evening investigation after which they will be enrolled into a 12-week lifestyle and weight loss programme. After 12-weeks, all 17 participants with NAFLD will have a follow up CAP, and morning and evening metabolic investigations (visit 2M & 2E).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| NAFLD |
| ||
| Controls (non-NAFLD) |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Lifestyle and weight loss advice | Behavioral | Commercially available lifestyle and weight loss intervention |
|
| Measure | Description | Time Frame |
|---|---|---|
| Change in hepatic fatty acid synthesis as measured by incorporation of 2H2 palmitate from 2H2O into very low density lipoprotein triglyceride (VLDL-TG) between morning and evening | 12 hours |
| Measure | Description | Time Frame |
|---|---|---|
| Difference in morning and evening glucose production and disposal (of a labelled stable isotope tracer) during a two-step hyperinsulinaemic-euglycaemic clamp | 12 hours | |
| Difference in morning and evening glucose oxidation measured by incorporation of 13C in breath CO2 across a 2-step hyperinsulinemia euglycaemic clamp |
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Inclusion Criteria:
Exclusion Criteria:
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NAFLD participants Confirmed by transient elastography (TE) with controlled attenuation parameter (CAP) ≥306 dB/m
Non-NAFLD Confirmed by transient elastography (TE) with controlled attenuation parameter (CAP) ≤215 dB/m
| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Jeremy Tomlinson | Contact | 01865 857359 | jeremy.tomlinson@ocdem.ox.ac.uk |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Oxford | Recruiting | Oxford | United Kingdom |
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| ID | Term |
|---|---|
| D065626 | Non-alcoholic Fatty Liver Disease |
| ID | Term |
|---|---|
| D005234 | Fatty Liver |
| D008107 | Liver Diseases |
| D004066 | Digestive System Diseases |
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Adipose and skeletal muscle tissue, urine, serum/plasma
| 12 hours |
| Changes in diurnal patterns of hepatic fatty acid synthesis after weight loss programme (measured by incorporation of 2H2 palmitate from 2H2O into very low density lipoprotein triglyceride (VLDL-TG) | 12 weeks |