Inclusion Criteria:  Age 18 or older Body mass index > 30 kg/m2 Systolic blood pressure > 150 mmHg Owns a smartphone or tablet operating the iOS or Android operating system  Exclusion Criteria:  Unable or unwilling to provide informed consent, including but not limited to cognitive or language barriers (reading or comprehension) Type 1 diabetes Use of insulin or insulin secretagogues (sulfonylureas, metaglinides) Use of medications that require food intake Ongoing use of pharmacologic therapy for weight loss Self-reported eating disorder Other medical condition that could be harmed by intermittent fasting as judged by study physician Anticipated life expectancy less than 6 months Any other reason why it is not feasible to complete the entire 6-month study