The Dysbiosis of the Intestinal Microbiota in Individuals With Allergic Rhinitis (MICRORIN)

Inclusion Criteria Allergic Rhinitis population: 1. Men and women over 18 years of age. 2. Sign the informed consent. 3. Present, according to the ARIA classification (Allergic Rhinitis ans its impact on Asthma), two or more of the following symptoms for more than one hour a day: * Aqueous rhinorrhea. * Sneezing, especially paroxysmal. * Nasal obstruction. * Itching or nasal itch. * Conjunctivitis (itching, lacrimation or redness). 4. Individuals presenting Persistent or Perennial type of RA, in which signs are present: * More than four days a week. * And for more than four consecutive weeks. Exclusion Criteria Allergic Rhinitis population: 1. Purulent Rhinorrhea. 2. Being pregnant. 3. Be in breastfeeding period. 4. Having diabetes (glucose ≥ 126 mg/dL). 5. BMI values \> 30 kg/m\^2. 6. Present dyslipidemia (LDL cholesterol ≥ 189 mg/dL and/or triglycerides ≥ 350 mg/dL). 7. Systolic Blood Pressure ≥ 160 mmHg and/or Diastolic Blood Pressure ≥ 100 mmHg. 8. Have received treatment with antibiotics 30 days before the start of the study. 9. Have received treatment with corticosteroids 30 days before the start of the study. 10. Individuals who usually intake prebiotics and/or probiotics supplements 30 days before the start of the study. Inclusion Criteria Control population: 1. Men and women over 18 years of age. 2. Sign the informed consent. 3. Do not present any signs or symptoms of RA. Exclusion Criteria Control population: 1. Being pregnant. 2. Be in breastfeeding period. 3. Having diabetes (glucose ≥ 126 mg/dL). 4. BMI values \> 30 kg/m\^2. 5. Present dyslipidemia (LDL cholesterol ≥ 189 mg/dL and/or triglycerides ≥ 350 mg/dL). 6. Systolic Blood Pressure ≥ 160 mmHg and/or Diastolic Blood Pressure ≥ 100 mmHg. 7. Have received treatment with antibiotics 30 days before the start of the study. 8. Have received treatment with corticosteroids 30 days before the start of the study. 9. Individuals who usually intake prebiotics and/or probiotics supplements 30 days before the start of the study.