The short answer
Before an RMR test, have nothing but water for at least 4 hours, avoid caffeine, nicotine and other stimulants, skip exercise until after your test, and arrive relaxed and rested.
- Fast for 4+ hours: water only—no food, coffee, tea, sugar-free gum, mints or energy drinks.
- No stimulants: caffeine, nicotine and pre-workout supplements raise your metabolic rate.
- No exercise beforehand: working out after your test is fine.
- Arrive rested: stress, poor sleep and illness can change your result.
Planning to repeat the test?
Use the same preparation each time—same time of day and same fasting window—so changes reflect your metabolism, not your morning. If you forget to fast, call us at (303) 758-9552 and we will help you reschedule.
Related questions
Body Fat USA offers $85 DEXA body composition scans and $100 RMR metabolic tests in Denver (both for $175), with reports emailed in about 5 minutes. See all FAQs
