Could a Heart-Healthy diet tame uncontrolled asthma?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age 18 years or older at study enrollment * Diagnosis of asthma with currently prescribed controller therapy (i.e., Step 2 or above) according to the 2020 asthma guideline update (EPR4) * Uncontrolled asthma on study screening based on Asthma Control Test (ACT) scores \<20 * Being able and willing to provide written informed consent and HIPAA authorization Exclusion Criteria: * Inability to speak, read or understand English sufficiently to provide valid informed consent * Primary diagnosis of COPD (emphysema or chronic bronchitis) * Previous cardiovascular disease: coronary heart disease (myocardial infarction, angina pectoris, percutaneous coronary intervention, coronary artery bypass graft surgery), cerebrovascular disease (stroke, transient ischemic attack), peripheral vascular disease, heart failure, or aortic aneurysm * Diabetes (other than during pregnancy) * Diagnosis of cancer (other than non-melanoma skin cancer) within the past year and/or actively receiving cancer treatment * Inflammatory bowel disease, colostomy, malabsorption, or major gastrointestinal resection * Diagnosis of bipolar or psychotic disorder * Hospitalization for psychological or emotional problems within the last 2 years * Cognitive impairment based on the Callahan 6-item screener67 * Terminal illness or in hospice or long-term care * Current diet of good quality (DASH concordance index ≥6 out of 9 total) * Current/planned participation in another structured program that overtly focuses on diet and nutrition * On special diet that precludes changes adherent to the DASH dietary pattern or otherwise unwillingness to modify current diet * Current use of prescription or non-prescription weight-loss products and unwillingness to stop taking them for the duration of the study * Underweight per body mass index (BMI) below 18.5 kg/m2 based on measured height and weight at study enrollment * Actively attempting to lose weight or weight change \>15 lbs during prior 3 months * Active alcohol or substance use disorder (including prescription drugs) based on the CAGE Questionnaire Adapted to Include Drugs (CAGE-AID)68 * Current within the past 6-months or former smoker (more than 20-packs of cigarettes in the lifetime, or current smoker) * Current or planned pregnancy or currently lactating * Planning to move out of the area during the study period * Participation in another clinical trial or investigational treatment study * Family/household member of an already enrolled participant or of a study team member * Investigator discretion for clinical safety or protocol adherence reasons