Time-restricted Eating, Window Timing, Type 2 Diabetes Status and Sex on Glycemic Control

Inclusion Criteria: * Aged 40 years or older * Body mass index \<50 kg/m2 * Have access to an Apple or Android cellphone with Bluetooth. * Have type 2 diabetes or be at risk for type 2 diabetes (defined as self-report of pre-diabetes, a recent (within 12 months) measure of HbA1c between 5.7 and 6.4%, waist circumference (WC) that is BMI specific; for women: BMI \>= 18.5-24.9, WC \>= 80cm; BMI \>= 25-29.9, WC \>= 90cm; BMI \>= 30-34.9, WC \>= 105cm; BMI \>= 35+, WC \>= 115cm; for men: BMI \>= 18.5-24.9, WC \>= 90cm; BMI \>= 25-29.9, WC \>= 100cm; BMI \>= 30-34.9, WC \>= 110cm; BMI \>= 35+, WC \>= 125cm. Exclusion Criteria: * Individuals with type 2 diabetes will be excluded if: (1) currently on \>2 monotherapies for diabetes, (2) have had diabetes therapy medication or dosage changes \<3 months, (3) self-reported hemoglobin A1c \>9.0%, (4) taking exogenous insulin, or (5) taking sulfonylureas * The following exclusion criteria applies to all potential participants: 1. History of or referral for bariatric surgery 2. Weight loss \>3% in the last 3 months 3. Taking antiobesity (weight loss) medications 4. Body weight \>390lbs 5. Diagnosed with severe cognitive disorder that precludes them from giving consent 6. Inability or unwillingness to change their eating window to follow those prescribed in the study 7. Currently consistently eating during \<11.5 hour period . 8. Physician-diagnosed eating disorder 9. Having a pacemaker or receiving dialysis. 10. Not having access to a Lifelabs location.