This study is designed as a N to 1 randomized trial, where each participant will be randomized to consume or abstain from coffee each day of a 14 day monitoring period. Participants will wear an automatically recording electrocardiographic monitor (ZIO® XT Patch), continuous glucose monitor (Dexcom G6), and a fitness tracker (Fitbit INSPIRE) while utilizing Eureka-a mobile application. We will compare participant self-report of caffeine consumption, glucose monitoring, fitness levels, sleep health, and heart rhythm data in order to better understand the relationship between acute caffeine consumption and heart rhythm changes. Participants will also be genotyped for caffeine metabolism-related SNPs. A total of 100 participants will be enrolled at the UCSF study site.
