Frequently Asked Questions


  1. How can I achieve the most accurate reading?
    Answer: For the most consistent and accurate readings, users should do the following when scanning body composition:
    • Stand with feet shoulder-width apart.
    • Grasp the BC3 firmly without squeezing hard (i.e., light "golf club" grip, no white knuckles). Hands and thumbs should be touching the metal bars. Thumbs should be pointing up.
    • The user's back should be straight and arms extended forward with elbows locked, but not hyperextended.
    • Make sure hands and fingers are not touching.
    • Hold the BC3 until the multicolored bar on the computer screen extends completely to the right.
  2. What is essential fat?
    Answer: This is the amount of fat you need to be healthy and for your body to function properly. Having less than this amount of fat can be dangerous to your health. Generally speaking, a female's essential fat is 10-12% and a male's is 2-4%. You can use this chart as a general guideline:

    General Adult Body Fat Percentages

    Classification: Women: Men:
    Essential Fat 10 - 13.99% 2 - 5.99%
    Athletes 14 - 20.99% 6 - 13.99%
    Fitness 21 - 24.99% 14 - 17.99%
    Acceptable 25 - 31.99% 18 - 24.99%
    At Risk 32% plus 25% plus
  3. Can I sit down and hold the BC3?
    Answer: It's best to stand, but the most important thing is to be consistent in your position every time you take a reading, as results may vary slightly from standing to seated positions.
  4. How does the BC3 Body Composition Analyzer work?
    Answer: The BC3 Body Composition Analyzer uses bio-impedance technology, a state-of-the art, very accurate method of determining body mass. The device sends a mild electrical current through your body, measuring both the strength and speed of the return current. From these readings, the software calculates your body mass. The device is safe, but you should not use it if you are pregnant or have an implanted electrical medical device such as a pacemaker.
  5. Will it hurt?
    Answer: No, the electrical current generated is extremely low power.
  6. How does it know how much body fat/water I have?
    Answer: The device sends a small number of electrical currents into your body. Because certain body tissues conduct electricity better than others, the device can measure the current leaving your body and estimate your body composition, based on very sophisticated algorithms developed over years of clinical testing.
  7. How often should I test my body fat?
    Answer: It is not a good idea to put much emphasis on back-to-back readings whether 1 day apart or 1 week apart. Looking for trends over a series of readings will give you much more help in reaching and maintaining your desired body composition.
  8. How accurate is this device?
    Answer: Based on recent studies the accuracy of scan results show no appreciable difference between hydrostatic weighing and DXA scans.
  9. If I just ate, drank, or worked out will it affect my results?
    Answer: In most instances it won't, but we recommend you adopt a routine of capturing your reading in the morning before you begin your daily activity.
  10. Why do other bio-impedance devices tell me I have really high body fat?
    Answer: With normal bio-impedance devices, your hydration status can affect the results. For example, the devices see that you don't have much body water, and since your body water is all contained within your lean body mass, the devices think you do not have very much lean tissue. And if you don't have very much lean tissue, the devices assume the rest must be fat.

Body Composition

  1. What is lean body mass?
    Answer: Lean body mass is everything in your body except body fat - muscles, bones, organs, blood, etc.
  2. Is there any way to know your true body composition?
    Answer: The only way to measure your body composition with 100% accuracy is to do an autopsy. Even a full body scan is not exact. Once you introduce estimation into the mix via an equation (which all methods do) it's impossible to be exact. The trick is to eliminate as much variability and error as possible given the tool you're using. Stayhealthy has spent over a decade refining its measurement algorithms to be as accurate as possible.
  3. Why do women have more body fat?
    Answer: In addition to the basic essential fat we all need, women have an additional 9-12% fat primarily to provide protection for child-bearing and to account for additional breast tissue.
  4. What should my lean body mass be?
    Answer: Your lean body mass is just the inverse of your body fat percentage, or in other words, everything but fat is lean body mass. By decreasing body fat and increasing lean body mass simultaneously, you improve the ratio, which is what you want to do, as long as you don't go below your essential body fat percentage. You can use this chart as a general guideline:

    General Adult Body Fat Percentages

    Classification: Women: Men:
    Essential Fat 10 - 13.99% 2 - 5.99%
    Athletes 14 - 20.99% 6 - 13.99%
    Fitness 21 - 24.99% 14 - 17.99%
    Acceptable 25 - 31.99% 18 - 24.99%
    At Risk 32% plus 25% plus
  5. How is the Stayhealthy Hydration Index measured?
    Answer: This question has been investigated through many research projects and clinical trials. At Stayhealthy we reviewed a number of published works on the subject and even conducted our own clinical trial. We have developed the Stayhealthy Hydration Index (SHI), which calculates on an individual basis, your specific hydration status based on broad population averages and studies.

    On the graph showing your hydration results is a line marked with zero. This represents the threshold for acceptable hydration, and should be considered the minimum level of hydration your body needs. A measurement above zero is desirable.

    Each person's zero point is calculated by determining the hydration of their lean mass (everything except fat), plus the water contained in their body fat. Just as physical makeup varies from person to person, so does the zero point.


  1. My CT1 Calorie Tracker shows I'm burning calories but I'm not losing any weight. What do I need to do?
    Answer: How many calories you're burning is only part of what you need to know to plan an effective weight loss program. Also important is how many calories you're consuming. If you're consuming as many or more than you're burning, then you won't lose weight. Don't reduce your calorie intake too much, though, or your metabolism will slow down, reducing your body's calorie-burning capabilities and your ability to lose weight.
  2. I got my CT1 Calorie Tracker wet and now it doesn't work. What should I do?
    Answer: Unfortunately the CT1 calorie tracker isn't completely waterproof. If the circuitry got wet it may be ruined for good. You can try letting is sit for a week or so to see if it dries out and starts to work. If not, you'll need to order another one – sorry!
  3. What do I do when I'm wearing clothing that doesn't have a waistband?
    Answer: While we suggest you wear your CT1 Calorie Tracker as often as you can, and to accurately track your calories burned it needs to be worn near your waist (your center of gravity), we understand that sometimes it's just not possible, and that's okay. If you can't wear it for a time (like when you're sleeping) it will still continue to count the calories your body is burning. It will just make the assumption that you're sleeping or lying down when you're not wearing it. So, just recognize that, if you're not wearing it and you're very active, the calories burned number will be less than you actually burned on that day. Remember, this is a marathon, not a sprint, and sometimes life will get in the way and throw up obstacles and roadblocks to your progress. Give yourself a break and do the best you can – just don't give up!
  4. I changed my battery on my CT1 and now it's not working any more. What's wrong?
    Answer: You need to re-initialize the unit each time your CT1's battery is changed. Once it loses power, it "forgets" who you are. Insert your CT1 into the docking station as you would to upload and log in. Once logged in, select your CT1 from the list box and click "initialize" on the right hand side, then simply follow the instructions. It should start working as before.
  5. My unit doesn't seem to be working right. What do I do?
    Answer: First, check the troubleshooting section of your user manual. If you're still having problems, contact your system administrator.
  6. Can someone else use my CT1?
    Answer: Only if they have an account and have re-initialized the unit to match their profile. Otherwise, the unit will probably not read their caloric burn accurately. You can purchase additional units for your friends and family. There is no limit to the number of units you can buy or use with a single docking station.
  7. How accurate is my CT1?
    Answer: For activities that involve "whole body movement" (such as running, walking, aerobic exercise, etc.) the CT1 is very accurate - the technology it's based on is used in major universities around the world to study physiology. For "specific area movement" (such as bicycling or weight lifting) it is not quite as accurate. We are currently in the process of modifying our algorithms to account for these circumstances. When completed, you won't have to do anything, the changes will be made automatically when you dock your device and upload your information.

Tracking Calories

  1. What does my calorie burn information mean?
    Answer: If you are using an activity monitor, every time you upload your activity data your information in the calorie burn section will automatically be updated. The large numeric and color coded value on your dashboard reflects your total calorie burn for the most recent 24 hour period for which you uploaded data. If the number is green then you are within ten percent of your daily calorie burn goal. Yellow indicates that you are between 10 and 20 percent below your goal, and red indicates that you are more than 20 percent below your goal.

General Questions

  1. Where can I get download the drivers I need to load my device (e.g. BC3 or CT1)?
    Answer: Each of our devices comes with specific directions. Please review the directions and download the software as needed. Should you have any further questions, please contact us at
  2. How do I order devices to use?
    Answer: Contact your system administrator.
  3. What is BMR and why is it important?
    Answer: Your body is constantly burning calories throughout the day, even when you're not being physically active. This is your Basal Metabolic Rate (BMR) and it is the minimum amount of calories your body needs to perform its day to day functions, such as digesting foods, maintain your normal heart rate and blood pressure, etc. Knowing your BMR number let's you understand and determine the amount of calories you need to manipulate to lose body fat.
  4. Can I change part of my profile?
    Answer: The fields in your Profile are editable at any time. You may change any of the information listed by simply selecting the Edit button associated with the field.
  5. What do the different colors mean?
    Answer: Stayhealthy uses colors to help you track your progress as you work at staying healthy. Numbers represented in the green color mean you are in the Healthy range; numbers represented in yellow mean you are in the Acceptable range and numbers represented in red mean you are in the At Risk range.
  6. Who do I contact if I think a device isn't working?
    Answer: You may contact us via email at should you be experiencing issues with one of our devices.

Goal Setting

  1. How do I set up a goal?
    Answer: The Stayhealthy Goal Setter will walk you step by step through creating your fat loss goal. It is important to remember that changing your body composition takes time. Reducing your body fat percentage 2-4% per month is a realistic goal. You can always return to the goal setter to set a new goal after you attain the one you set now. You can access to Goal Setter within the Goals area of the dashboard.
  2. May I revise a goal I have already created?
    Answer: You may revise your goal at any time by selecting the Goal Setter and changing your goal or the date by which you wish to achieve your goal. You can access the Goal Setter within the Goals area of the dashboard.