Plain English Summary
Background and study aims
Regular intake of nuts, naturally rich in monounsaturated fats (MUFA) or other polyunsaturated (PUFA) sources may reduce the risk of developing cardiovascular disease (CVD) and also improve lipid profile (fats and cholesterol in the blood). People with a high level of serum lipids (that is, a lot of fat in the blood) seem to be more susceptible to oxidative stress (damage caused by free radicals) and CVD. They may therefore benefit from an increased nut or MUFA and PUFA intake. The aim of this study is to investigate the effect of hazelnuts eaten as snack or source of polyunsaturated fats (e.g. alpha-linolenic acid) on markers of oxidative stress (that is, substances that show the presence of oxidative stress), inflammation, lipid profile, dietary markers and intestinal microflora (microbiota) composition in children and adolescents with dyslipidemia (abnormal amounts of fat in the blood)
Who can participate?
Children aged 5-17 with dyslipidemia
What does the study involve?
At the beginning of the study, all participants are given dietary guidelines and are randomly allocated to one of three groups. One group eat a daily portion of hazelnuts with skin (15-30 g/Kg, based on body weight), one group eat the same amount of hazelnuts without skin and a control group receive only the dietary guidelines and are not given nuts to eat or a diet otherwise enriched with other sources of unsaturated fats. Blood samples are taken for all participants from all groups at the start of the study and then 8 weeks later for analysis.
What are the possible benefits and risks of participating?
The intake of hazelnuts as a snack is expected to improve the lipid profile and reduce the levels of oxidative stress in children and adolescents with dyslipidemia. There is are expected risks associated with the eating of the hazelnuts.
Where is the study run from?
The University of Turin and University of Milan (Italy)
When is the study starting and how long is it expected to run for?
January 2015 to December 2016
Who is funding the study?
The European Regional Development Fund
Who is the main contact?
1. Prof. Patrizia Riso (scientific)
patrizia.riso@unimi.it
2. Prof. Ornella Guardamagna (scientific)
ornella.guardamagna@unito.it
Trial website
Contact information
Type
Scientific
Primary contact
Prof Patrizia Riso
ORCID ID
http://orcid.org/0000-0002-9204-7257
Contact details
Università degli Studi di Milano
Via Celoria 2
Milano
20133
Italy
+39 (0)250 316 726
patrizia.riso@unimi.it
Type
Scientific
Additional contact
Prof Ornella Guardamagna
ORCID ID
Contact details
Università degli Studi di Torino
Piazza Polonia 94
Torino
10126
Italy
+39 (0)113 135 243
ornella.guardamagna@unito.it
Additional identifiers
EudraCT number
ClinicalTrials.gov number
Protocol/serial number
Protocol number: EC:CS377
Study information
Scientific title
Effect of hazelnut or polyunsaturated fat intake on oxidative stress related markers and lipid profile in children and adolescents with primary dyslipidemia
Acronym
NO-OX Stress
Study hypothesis
Dyslipidemia is a major risk factor for cardiovascular disease development and it is closely associated with a decrease of antioxidant defense mechanisms. Nuts are rich sources of bioactives such as monounsaturated and polyunsaturated fatty acids, vitamins, phytosterols and polyphenols. We hypothesized that regular consumption of hazelnuts or other polyunsaturated sources (e.g. alpha-linolenic acid) could have a beneficial effect on dyslipidemia improving lipid profile and cell protection against oxidative DNA damage. Moreover, dietary interventions with polyunsaturated fats could also affect microbiota composition and inflammatory conditions eventually associated to dyslipidemia.
Ethics approval
Ethics Committee of the City of Health and Science University Hospital of Turin, 22/01/2015, ref: EC:CS377
Study design
8-week randomized controlled parallel single-blind dietary intervention study
Primary study design
Interventional
Secondary study design
Randomised controlled trial
Trial setting
Hospitals
Trial type
Quality of life
Patient information sheet
Not available in web format, please use the contact details to request a patient information sheet
Condition
Familiar dyslipidemia
Intervention
The study is an 8-week randomized, controlled, parallel, single-blind dietary intervention study. Subjects receive dietary guidelines and individually randomized to the following three parallel groups of 20 subjects each:
Group 1: Children consuming hazelnuts with skin as snack (between 15-30 g per day, based on body weight)
Group 2: Children consuming hazelnuts without skin as snack (between 15-30 g per day, based on body weight)
Group 3: Children who do not consume nuts (or children consuming other sources of unsaturated fats)
At the beginning and at the end of the intervention (t= 8 weeks), blood and stool samples are collected and used to evaluate the oxidative stress related markers (e.g. DNA damage, oxidized LDL, PON-1 concentration, etc.), the serum lipid profile and erythrocyte membrane phospholipids composition. In addition, dietary and metabolic markers (e.g. microbiota composition, inflammatory related markers, etc.) are analysed.
Intervention type
Other
Phase
Drug names
Primary outcome measure
Endogenous oxidized DNA bases (using enzyme formamidopyrimidine-DNA glycosylase) measured by Comet assay in peripheral blood mononuclear cells at baseline (t=0) and at the end of intervention (t=8 weeks)
Secondary outcome measures
1. Changes in serum lipid profile triglycerides, total cholesterol, high density lipoprotein (HDL)-cholesterol, low density lipoprotein (LDL)-cholesterol
2. Changes in erythrocyte phospholipids composition
3. Changes in anthropometric characteristics (age, weight, height, body mass index)
4. Changes in blood pressure (diastolic and systolic blood pressure)
5. Changes in oxidized LDL and paraoxonase 1 (PON-1)
6. Changes in markers of inflammation
7. Changes in microbiota composition
All assessed at baseline and at the end of intervention (8 weeks)
Overall trial start date
01/01/2015
Overall trial end date
31/12/2016
Reason abandoned (if study stopped)
Eligibility
Participant inclusion criteria
1. Children aged 5-17 years affected by primary dyslipidemia (familiar hypercholesterolemia, familiar combined hyperlipidemia and undefined hypercholesterolemia),
2. Total cholesterol and/or triglycerides value higher than their age- and sex-specific 90th percentile
3. Body mass index (BMI) <95th percentile
Participant type
Patient
Age group
Child
Gender
Both
Target number of participants
60 children/adolescents
Participant exclusion criteria
1. Secondary dyslipidemias, overweight or obesity (BMI ≥ 85th and ≥ 95th percentile, age and sex matched, respectively)
2. Children under lipid-lowering treatment (including functional foods) from the 3 months before the beginning of the study
3. History of renal, endocrine, liver disorders, or chronic diseases (i.e., immunologic, neurologic, or oncohematologic disorders)
4. Smokers
5. Use of any drugs, supplements, specific prebiotics or probiotics or medications at least one month before the beginning of the experiment.
6. Subjects with specific aversion or allergies to food under study
Recruitment start date
01/01/2015
Recruitment end date
31/05/2016
Locations
Countries of recruitment
Italy
Trial participating centre
University of Turin (Università degli Studi di Torino)
Department of Health, Sciences and Pediatric
Piazza Polonia 94
Torino
10126
Italy
Trial participating centre
University of Milan (Università degli Studi di Milano)
Department of Food, Environmental and Nutritional Sciences Division of Human Nutrition
Via Celoria 2
Milano
20133
Italy
Sponsor information
Organisation
Regione Piemonte
Sponsor details
Piazza Castello 165
Torino
10123
Italy
Sponsor type
Other
Website
Funders
Funder type
Not defined
Funder name
European Regional Development Fund
Alternative name(s)
Europski Fond za Regionalni Razvoj, Den Europæiske Fond for Regionaludvikling, Europees Fonds voor Regionale Ontwikkeling, Euroopa Regionaalarengu Fond, Fonds Européen de Développement Régional, Europäische Fonds für regionale Entwicklung 3, Európai Regionális Fejlesztési Alap, Fondo Europeo di Sviluppo Regionale, Eiropas Regionālās Attīstības Fonda, Europos Regionines Pletros Fondas, Europejski Fundusz Rozwoju Regionalnego, Fundo Europeu de Desenvolvimento Regional, Fondul European de Dezvoltare Regională, Európsky Fond Regionálneho Rozvoja, Fondo Europeo de Desarrollo Regional, FEDER, ERDF
Funding Body Type
government organisation
Funding Body Subtype
federal/national government
Location
Results and Publications
Publication and dissemination plan
Intention to publish date
31/12/2017
Participant level data
Other
Basic results (scientific)
Publication list
2017 results in: https://www.ncbi.nlm.nih.gov/pubmed/28606702
2018 results in: https://www.ncbi.nlm.nih.gov/pubmed/29753234