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Personalized nutrition is one of the most up to date trends in human nutrition and gains much interest of general public and scientists as well. Although we have gained some knowledge on gene-trait associations, the real effectiveness and usefulness of genotype-based nutritional recommendations is unknown. Many personalized nutrition companies are on the market today, some of them use personalized nutrition based on genotype analysis. For this reason, scientific basis of this approach should be clarified. Moreover, the effect of using genotype information in dietary interventions aimed at decreasing caffeine intake has never been tested. Our project can thus increase knowledge which can be applied in dietary counseling practice. Although we focus on caffeine intake, the study is designed as a proof of concept.
Considering current knowledge and recognizing the existing gaps we hypothesize that providing genotype information may increase adherence to dietary recommendations.
The main aim of the project is thus testing the effectiveness of a genotype-based personalized dietary intervention targeted at decreasing caffeine intake.
Specific aims of the study include:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| study group | Experimental | group will receive dietary advice and genotype information |
|
| Control group | Active Comparator | group will receive dietary advice |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Intervention group with genotype information | Behavioral | Results of genotyping will be translated into personalised dietary recommendations. Subjects will be informed about their genotypes from the beginning of the study. The importance of personalised recommendations will be explained. |
| Measure | Description | Time Frame |
|---|---|---|
| Caffeine intake level from dietary sources | caffeine intake (mg/day) | baseline, 20 week |
| frequency of minor allel | genotyping for CYP1A2 polymorphism (rs762551); assessment of possible genotypes (AA, AC, CC) will be performed with the use of TaqMan probes | Baseline |
| Measure | Description | Time Frame |
|---|---|---|
| body mass(BM) | Changes in BM (kg) within groups and between groups | Baseline, 20 weeks |
| Fat Free Mass (FFM) | FFM changes within (kg) groups and between groups |
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Inclusion criteria:
Exclusion criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Ewa Bulczak, Msc | Poznan University of Life Science | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Poznan University of Life Sciences | Poznan | Poland |
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| ID | Term |
|---|---|
| D035061 | Control Groups |
| ID | Term |
|---|---|
| D015340 | Epidemiologic Research Design |
| D004812 | Epidemiologic Methods |
| D008919 | Investigative Techniques |
| D012107 | Research Design |
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eligible volunteers will be randomly assigned to one of the study groups which receive either dietary advice or dietary advice and genotype information
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|
| Control group without genotype information | Behavioral | Subjects will receive personalised dietary recommendations, but at the beginning they will not be informed about their genotypes and the meaning of personalisation. Information about their genotype will be given to the participants at the and of study. |
|
| Baseline, 20 weeks |
| Fat Mass% (FM%) | FM% changes within groups and between groups | Baseline, 20 weeks |
| Total cholesterol (TChol) | Changes in TChol (mg/dl) within groups and between groups | Baseline, 20 weeks |
| Blood HDL-cholesterol (HDL-C) | HDL-C (mg/dl) concentrations change within the group and between the groups | Baseline, 20 weeks |
| Blood LDL-cholesterol (LDL-C) | LDL-C (mg/dl) concentrations change within the group and between the groups | Baseline, 20 weeks |
| Blood triacylglycerol (TAG) | TAG (mg/dl) concentrations change within the group and between the groups | Baseline, 20 weeks |
| Blood glucose (GLU) | GLU (mg/dl) concentrations change within the group and between the groups | Baseline, 20 weeks |
| Insulin (INS) | INS (ulU/ml) concentrations change within the group and between the groups | Baseline, 20 week |
| Dietary intake | macro and micronutrient intake (g,mg,ug) | Baseline |
| aspartate aminotransferase (ASPAT) | ASPAT [U/l] Changes within groups and between groups | Baseline, 20 weeks |
| Alanine transaminase (ALAT) | ALAT [U/l] Changes within groups and between groups | Baseline, 20 weeks |
| waist circumference (WC) | WC (cm) Changes within groups and between groups | Baseline, 20 weeks |
| hips circumference (HC) | HC (cm) changes within groups and between groups | Baseline, 20 weeks |
| D008722 | Methods |