Cardiovascular Effects of Purple-Fleshed Potatoes

Official title

Cardiovascular Biomarkers and Plasma Metabolites Variation Induced by Purple Fleshed Potatoes Consumption in Prehypertensive Men

Overview

This study is being done to evaluate the effect on cardiovascular biomarkers and anthocyanin-derived plasma metabolites of Peruvian native purple-fleshed potato consumed over a 4-week period by prehypertensive men ages 18-40 years old. Subjects will undergo blood pressure monitoring, anthropometric measurements, laboratory analysis, plasma metabolic profile assessments and microbiome metagenomic analysis before and after finishing the potato consumption period. Hypertension is a chronic disease that affects over 20% of Peruvians aged 15+, with higher prevalence in men. Previous studies on purple flesh varieties have shown reductions in blood pressure and improvements in vascular function. Potatoes are a major dietary staple and a source of many compounds beyond carbohydrates, including vitamins, minerals, and polyphenols. Anthocyanins are polyphenol compounds that give purple potatoes their color, and are known for its antioxidant, anti-inflammatory, and vasodilatory properties. Hence, this work aims to generate novel evidence on the cardiovascular benefits of Peruvian purple flesh potatoes that could lead to its inclusion on preventive dietary strategies and enhance the value of local agriculture. Moreover, as purple flesh potatoes have unique anthocyanins such as petunidin and peonidin whose metabolization has not yet been studied, understanding their metabolization and bioavailability will aid in a better understanding of their observed impact on health. The study is designed as a randomized, controlled, crossover nutritional intervention involving 30 male prehypertensive participants aged 18-40 (BMI \< 30 kg/m2, 120-139 mmHg SBP and/or 80-89 mmHg DBP), with an expected final sample of 21. Each participant will consume a daily portion over a four-week period of potato purée of either purple- or white-fleshed varieties according to the corresponding treatment, with a one-week washout period between treatments. The portion will consist of a rehydrated purée derived from freeze-dried steamed tubers equivalent to 400 grams of fresh weight. All measurements will be taken before each treatment period beginning and after its ending. Anthropometry measurements will include waist circumference, height and weight to calculate BMI. Blood pressure will be measured at fasting and postprandial state. Blood samples will be taken at fasten state for measuring biochemical markers glucose, lipid profile, creatinine, C-reactive protein, and antioxidant capacity. Saliva samples will be taken at fasten state for microbiome analysis. Blood samples for plasma metabolomic analysis will be taken at fasten state before the intervention as a basal measurement and after potato consumption (1 postprandial hour) on the treatment last day. Dietary intake and physical activity will be monitored using 24-hour recall and IPAQ short form questionnaires.

Interventions

• Other Purple flesh potato
  Dietary Intervention: Purple flesh potato pureé, rich in anthocyanins food Dietary Intervention: white flesh potato pureé, control
• Other White flesh potato
  Dietary Intervention: Purple flesh potato puree, rich in anthocyanins food Dietary Intervention: white flesh potato puree, control

Primary outcome measures

• Changes in blood pressure [Time frame: 8 weeks (4 weeks per treatment)]

Secondary outcome measures (4)

• Changes in lipid profile [Time frame: 8 weeks (4 weeks per treatment)]
• Changes in fasting glucose [Time frame: 8 weeks (4 weeks per treatment)]
• Changes in plasma antioxidant capacity [Time frame: 8 weeks (4 weeks per treatment)]
• Changes in CRP [Time frame: 8 weeks (4 weeks per treatment)]

Eligibility criteria

Inclusion criteria

• Men aged 18-40 years.
• BMI between 18.5 and 35 kg/m².
• Prehypertensive individuals with systolic blood pressure (SBP) of 120-139 mmHg and/or diastolic blood pressure (DBP) of 80-89 mmHg.
• Fasting glucose ≤125 mg/dL.
• Willing to attend the study center for 42 days for potato consumption and measurement procedures.
• Willing to consume the equivalent of 400 g of fresh potatoes daily during two 4-week periods, separated by a 7-day washout period.
• Individuals who agree to and sign the informed consent form.
• Not taking blood pressure-lowering and/or cholesterol-lowering medications. Smokers. Taking supplements containing antioxidants. Engaging in high-intensity physical activity according to the short version of the International Physical Activity Questionnaire (IPAQ).

Exclusion criteria

• Individuals with chronic gastrointestinal disorders, kidney disease, or diabetes, previously diagnosed or identified through screening via a questionnaire.
• Individuals currently taking antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs), blood pressure medications, and/or cholesterol-lowering medications.
• Participants who do not complete the study or who develop an acute health condition during the study period.
• Participants with C-reactive protein (CRP) levels > 10 mg/L. Smokers.
• Taking supplements containing antioxidants.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: Yes

Study design

Allocation

Randomized

Model

Crossover

Masking

Open label

Primary purpose

Prevention

Study locations

Center list to be confirmed — check the primary protocol.

Identifiers

NCT: NCT07734948 · 440-2026/CIEI-IIN

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗