About this trial
The overall objective of this multi-center study is to use metabolic response data from different dietary challenges to develop personalized dietary advice. Effectiveness of this personalized dietary advice compared to a general healthy diet based on national dietary guidelines on markers of cardio-metabolic health will be tested.
A total of 120 men and women who meet all inclusion criteria and none of the exclusion criteria will be invited to participate. The study will be conducted at three sites: Chalmers University of Technology (Sweden), University of Wageningen (Netherlands), and University of Oslo (Norway), with 40 participants per site.The study is conducted in two parts. The first part, the characterization phase, is a three-way randomized, controlled cross-over design, featuring one-day meal tests with isocaloric meals containing different carbohydrate, fat and protein quantity as well as quality. Based on the metabolic response to the meal tests a personalized diet will be constructed. In the second part, the main intervention, effectiveness of this personalized dietary advice compared to a general healthy diet will be tested in a six week parallel group intervention study.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
Men and women
Age 40 to 70 years
Body mass index (BMI) 27-35 kg/m2
Signed informed consent
Disqualifiers
History of diagnosed cardiovascular disease (e.g. stroke, heart disease)
Diagnosed type 1 or type 2 diabetes
Finger prick glucose test at screening indicating diabetes (fasting >6.9 mmol/L; non-fasting >11.0 mmol/L)
Antibiotic use in the last 3 months
Trial design
Parallel
Treatments tested in this trial
General healthy diet
Other interventionGeneral healthy diet based on national health dietary guidelines.
Personalized diet
Other interventionPersonalized diet will be based on an algorithm considering the individuals' postprandial glucose, triglycerides and inflammation markers to each of the three study meals in the characterization phase (Phase I) matched with established knowledge about the effects of specific foods on such metabolic parameters.
Treatment groups
Trial outcomes
Primary outcomes
Glucose postprandial
Difference between groups in postprandial glucose in response to a mixed meal tolerance test.
Triglycerides postprandial
Difference between groups in postprandial triglycerides in response to a mixed meal tolerance test.
Interleukin-6 postprandial
Difference between groups in postprandial interleukin-6 in response to a mixed meal tolerance test.
Secondary outcomes
Inflammatory markers in blood
Differences in immunological responses (such as cytokines, lipopolysaccharides, GlycA) between test meals in the characterization phase of the study.
Appetite
Differences in self-reported appetite measured using a visual analogue scale between test meals in the characterization phase of the study.
Gut microbiome
Differences in fecal microbiome between test meals in the characterization phase of the study.
Metabolome
Differences in metabolome (plasma, urine and feces) between test meals in the characterization phase of the study.
Other outcomes
Dietary biomarkers
Exploratory analysis of blood, urine and feces to find potential biomarkers reflecting dietary intake in the characterization and intervention phase of the study.
Responsivness to diet
Exploration of underlying mechanisms behind response/non-response to personalized and general healthy diet using data from both the characterization phase (meal test) and the primary 6-week intervention.
Gastric emptying
Gastric emptying will be assessed by breath test at one of the test meals in a sub-group of participants (Swedish and Norwegian site).
Gastric passage time
Gastric passage time will be assessed using the blue dye method.
Sponsors and contacts
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Chalmers University of Technology
Lead sponsor
University of Oslo
Collaborator
Wageningen University
Collaborator
Polish Academy of Sciences
Collaborator
Maastricht University
Collaborator
German Cancer Research Center
Collaborator
University of Copenhagen
Collaborator
University of Oulu
Collaborator
University College Dublin
Collaborator