Bioavailability and Beneficial Properties of Coffee and Cocoa Bioactive Compounds

Study Overview
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Brief Summary
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The aim of this study will be to define the bioavailability and the beneficial properties of coffee bioactive compounds. Moreover, the contribution of cocoa-based products containing coffee to the pool of circulating metabolites will be investigated with the aim of evaluating the effect of the combination of bioactives from different sources. To study the bioavailability of coffee/cocoa bioactive compounds and their effects in cardiometabolic health, the objectives will be: i) Assessing the bioavailability of the four main groups of phytochemicals in roasted coffee (methylxanthines, phenolic compounds, trigonelline, and diterpenes), its modulation by the level of consumption, and establishing the daily average concentration of coffee-derived plasma circulating metabolites; ii) Investigating the effect of different levels of coffee consumption on cardiometabolic risk factors; iii) Evaluating circulating metabolites and their putative bioactivity when substituting coffee consumption with the intake of cocoa-based products containing coffee. A 3-arm, crossover, randomized trial will be conducted. Twenty-one volunteers will be randomly assigned to consume three treatments in a random order for 1 month: 1 cup of espresso coffee/day, 3 cups of espresso coffee/day, 1 cup of espresso coffee at breakfast and 2 cocoa-based products containing coffee two times per day. The last day of the treatment subjects will refer to the ambulatory where blood and urine samples will be collected at specific time points up to 24 hours following the consumption of the testing coffee or of the cocoa-based products containing coffee. In addition to the bioavailability of the bioactive compounds, the effect of the coffee consumption on several cardiometabolic risk factors (blood pressure, anthropometric measures, inflammatory markers, nitric oxide, blood lipids, fasting indices of glucose/insulin metabolism, DNA damage, eicosanoids, nutri-metabolomics) will be investigated. At the end of the treatment, the same protocol will be repeated, switching the allocation group.

Detailed Description
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A human bioavailability study will be carried out to achieve the above-described goals. The human intervention study will consist of a short-term randomized cross-over trial, addressed at measuring the daily mean concentrations of each coffee/cocoa-derived circulating metabolite (CCDCM) for the four main groups of coffee/cocoa phytochemicals (methylxanthines, trigonelline, phenolics, diterpenes). On the basis of different patterns of consumption, this free-living study (although some minimal dietary restrictions will be provided two days before sampling times) will also take into consideration the effects of repeated doses on the bioavailability of coffee/cocoa bioactives. The study will follow a repeat-dose, 3-arm, cross-over design. This design has been chosen according to ILSI's guidelines for intervention trials with dietary products. Subjects were assigned to consume the following treatments in a random order for 1 month: 1 cup of espresso coffee/day (low consumers) at 9.00 A.M. 3 cups of espresso coffee/day (high consumers) at 9.00 A.M., 12.00 P.M.noon and 3.00 P.M. 1 cup of espresso coffee at breakfast 9.00 A.M. and 2 cocoa-based products containing coffee two times per day (at 12.00 P.M.noon and 3.00 P.M.). The group will be named medium consumers, considering the caffeine content of the cocoa-based products containing coffee. Minimal recommendations to avoid other sources of coffee/cocoa phytochemicals besides what introduced through the assigned treatment, and to standardise the time of coffee consumption, will be provided for the two days prior to each sampling day and on the sampling day. Dinner timing and composition will also be standardised the day before the sampling day. Only water could be drunk during the night. At the sampling day (i.e. the last day of each intervention period), the subjects will refer in the morning at the ambulatory where fasting baseline blood and urine samples will be collected. Then, low and high consumers will drink one or three cups of espresso coffee, respectively (without sugar, sweeteners, and milk for the first coffee; with 5 g of sugar for the last two coffees), while medium consumers will drink a cup of espresso coffee and 2 cocoa-based products containing coffee twice during the day, following the above-described timing. After ingestion of the first coffee together with a phytochemical-free breakfast (a pastry), blood and urine samples will be collected at selected time points along the following 24-h. Five hours after the consumption of the first coffee, participants will receive a standardised mixed meal (sandwich with ham and cheese) free of coffee/cocoa phytochemical-related compounds. Water will be available ad libitum. Twenty-four hours after receiving the treatment, blood and urine samples will also be taken in order to assess return to baseline. In addition, anthropometric characteristics and blood pressure (BP) will be measured. Socio-demographic variables will be assessed through a generic questionnaire filled at recruitment. The questionnaire will also contain questions useful to identify possible exclusion criteria (e.g. diagnosis for diseases, regular consumption of medication, food allergy). Dietary habits of volunteers will also be evaluated during the enrollment, through a semi-quantitative food frequency questionnaire (FFQ) for the assessment of dietary total antioxidant capacity. In addition, participants' food intakes and compliance with the study requirements will be assessed by means of 3-day dietary records, administered throughout each intervention period at two time points: i) in the middle of each intervention period during two weekdays and a weekend day, and ii) at the end of each intervention period, 2 days prior to the sampling day and the sampling day. The habitual physical activity level of each participant will be measured through a validated International Physical Activity Questionnaires. Blood sample collection will be carried out in the ambulatory unit of the Department of Medicine and Surgery. Blood collection will be carried out by a physician. A venous catheter will be inserted into the antecubital vein and blood samples from each subject will be collected in specific tubes over 24 hours. Blood sampling at time-point 24h after first coffee consumption will be done by venipuncture. Urine samples will be collected during different periods of time using urine collectors. Blood samples will be centrifuged and plasma, serum and peripheral blood mononuclear cells (PBMCs) will be collected, aliquoted, and stored at -80 °C for further processing. Urine samples will be aliquoted and stored at -80°C for further processing. The primary selected endpoint of the study is the quantification of the daily mean concentration of coffee-derived plasma circulating phenolic metabolites, whereas the study of the bioavailability of other coffee-derived circulating bioactives, the bioavailability of cocoa-derived circulating phytochemicals, and the assessment of cardiometabolic markers will be considered secondary endpoints.

Official Title
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Bioavailability and Beneficial Properties of Espresso Coffee and Confectionery Derived Coffee Bioactive Compounds

Conditions
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Diet Modification, Cardiovascular Risk Factor, Nutritional and Metabolic Diseases

Intervention / Treatment
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* Other: cup of espresso coffee
* Other: cocoa-based products containing coffee


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: adult both genders healthy normal weight (BMI 18-25) regular coffee consumers of 1-5 cups per day Exclusion Criteria: younger than 18 y.o. or older than 60 y.o. clinically diagnosis for metabolic, renal or digestive disorders regular consumption of medication antibiotic therapy taken within the last 3 months intense physical activity pregnancy or lactation underweight or overweight/obese no regular consumption of coffee or regular intake exceeding 5 coffees/day

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: low consumers<br>1 cup of espresso coffee/day at 9.00 A.M. for 1 month | Other: cup of espresso coffee<br>* Subjects will consume the assigned treatment for one month. Espresso coffee will be prepared by using coffee capsules. Serving size: approximately 45 mL. The last day of the intervention is the sampling day.<br>|
| Experimental: high consumers<br>3 cup of espresso coffee/day at 9.00 A.M. 12.00 P.M. and 3.00 P.M. for 1 month | Other: cup of espresso coffee<br>* Subjects will consume the assigned treatment for one month. Espresso coffee will be prepared by using coffee capsules. Serving size: approximately 45 mL. The last day of the intervention is the sampling day.<br>|
| Experimental: medium consumers<br>1 cup of espresso coffee at 9.00 A.M. + cocoa-based products containing coffee at 12.00 P.M. and 3.00 P.M. for 1 month | Other: cup of espresso coffee<br>* Subjects will consume the assigned treatment for one month. Espresso coffee will be prepared by using coffee capsules. Serving size: approximately 45 mL. The last day of the intervention is the sampling day.<br>Other: cocoa-based products containing coffee<br>* Subjects will consume the assigned treatment (2 products per serving) for one month. Serving size: approximately 37 g. The last day of the intervention is the sampling day.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Daily mean concentration of phenolic metabolites | Assessment of the daily mean concentration of coffee derived plasma circulating phenolic metabolites | 24 hours (0 -overnight fasting-, 30, 60, 120, 180, 240, 300, 360, 420, 480, 540, 1440 -overnight fasting- minutes) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Coffee-derived plasma circulating bioactives | Profile of metabolites coming from coffee phytochemicals (phenolic compounds, trigonelline, caffeine, and diterpenes) in plasma | 24 hours (0 -overnight fasting-, 30, 60, 120, 180, 240, 300, 360, 420, 480, 540, 1440 -overnight fasting- minutes) | 
| Coffee-derived bioactives in urine | Profile of metabolites coming from coffee phytochemicals (phenolic compounds, trigonelline, caffeine, and diterpenes) in urine | 24 hours (0 -overnight fasting-, 180, 360, 540, 1440 -overnight fasting- minutes) | 
| Cocoa-derived plasma circulating bioactives | Profile of metabolites coming from cocoa phytochemicals (phenolic compounds and theobromine) in plasma | 24 hours (0 -overnight fasting-, 30, 60, 120, 180, 240, 300, 360, 420, 480, 540, 1440 -overnight fasting- minutes) | 
| Cocoa-derived bioactives in urine | Profile of metabolites coming from cocoa phytochemicals (phenolic compounds and theobromine) in urine | 24 hours (0 -overnight fasting-, 180, 360, 540, 1440 -overnight fasting- minutes) | 
| Blood Pressure | Systolic and diastolic blood pressure | two time (0 -overnight fasting-, 1 month-fasting-) | 
| Body Mass Index (BMI) | Weight (in kg) and height (in m) will be combined to report BMI in kg/m2 | two time (0 -overnight fasting-, 1 month-fasting-) | 
| Waist circumference |  | two time (0 -overnight fasting-, 1 month-fasting-) | 
| Trimethyl-ammine-N-oxide (TMAO) in plasma |  | 24 hours (0 -overnight fasting-, 30, 60, 120, 180, 240, 300, 360, 420, 480, 540, 1440 -overnight fasting- minutes) | 
| Trimethyl-ammine-N-oxide (TMAO) in urine |  | 24 hours (0 -overnight fasting-, 180, 360, 540, 1440 -overnight fasting- minutes) | 
| Nitric oxide (NO) in plasma |  | 1440 -overnight fasting- minutes | 
| Blood lipids | Total cholesterol, HDL, LDL, triglycerides | 1440 -overnight fasting- minutes | 
| Glucose and Insulin | Fasting glucose and fasting insulin | 1440 -overnight fasting- minutes | 
| DNA damage | Assessed by using the Comet assay | 24 hours (0 -overnight fasting-, 60, 240, 420, 1440 -overnight fasting- minutes) | 
| DNA catabolites | Assessed by using LC-MS for individual detection and quantification | 24 hours (0 -overnight fasting-, 60, 240, 420, 1440 -overnight fasting- minutes) | 
| Nutri-metabolomics in plasma | Metabolomics will be carried out in fasting plasma to unravel the potential metabolic pathways of molecules present in the food matrix | 1440 -overnight fasting- minutes | 
| Nutri-metabolomics in urine | Metabolomics will be carried out in urine to unravel the potential metabolic pathways of molecules present in the food matrix | 24 hours (0 -overnight fasting-, 180, 360, 540, 1440 -overnight fasting- minutes) | 
| Eicosanoids in urine |  | 24 hours (0 -overnight fasting-, 180, 360, 540, 1440 -overnight fasting- minutes) | 
| Inflammatory markers in plasma | Main inflammatory markers associated with coffee consumption | 1440 -overnight fasting- minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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coffee, cocoa, bioavailability, pharmacokinetics, cardiometabolic risk factors, caffeoylquinic acids, flavan-3-ol, caffeine, trigonelline, diterpene