Inclusion Criteria:  Age 18 years or older Ability to speak and read English Previously enrolled in the protocol titled "COVID-19 CHAMPS study" (IRB-FY2020-215) (ClinicalTrials.gov: NCT04370821) Willing to be contacted about other studies (i.e., CHAMPS study participants who agreed to be contacted about future research opportunities) Works in the healthcare professions Elevated eating distress as indicated by Loss of Control Eating scores above the median of 2 in this cohort. Owns either an iPhone or Android smartphone for running the app involved in the intervention  Exclusion Criteria:  History of a heart transplant or a pacemaker. Uncontrolled kidney disease Uncontrolled diabetes Heart failure COPD (Chronic Obstructive Pulmonary Disease) Use of tricyclic antidepressant (e.g., nortriptyline, amitriptyline) above 75 mgs daily Use of illicit stimulants (e.g., cocaine) or narcotic drugs Inability to perform study protocol (self selected) Current use of HRV biofeedback training