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Jeff on the Radio

Recorded Conference Call
with Jeff Boris


How FIT are your body’s natural systems
of detoxification for today’s world?

Click Here To Play or Right Click and Save As To Download. 

With the #1 focus of New Year’s Resolutions on Fitness and Fat Loss here’s some helpful information to ensure you are gauging progress for more effective feedback and motivational goal setting. The most common approach to monitoring changes in body composition is using either a scale or hand-held device based on bio-electrical impedance analysis (BIA). See more detailed explanation in my article “What You Need to Know about BIA for Measuring Body Composition: A Thorough Review” which is available for download through my website.

For years, when I first used BIA under “standard” and “controlled” conditions I thought I was getting a relatively accurate measurement. However, what is “standard” and to what degree can we “control” influencing variables? When I was first helping clients achieve a typical fat loss of only 1-3lbs per week and muscle gain of 1-2lbs per week through more conventional approaches to exercise and nutrition BIA seemed to tell me what I needed to know. However, with the introduction of more advanced training techniques and nutrition protocols complemented by total body cleansing the limitations of BIA became much more apparent as my clients consistently began releasing 7-15lbs of body fat per week while gaining 2-4lbs of muscle.

Visibly, while they became dramatically leaner and stronger with correlated girth measurements, their BIA measurements of changes in body composition were not making any sense! It was only after repeating numerous measurements with professional quality skinfold calipers using a variety of sites and formulas that I discovered what was happening and found the research to back it up. BIA is NOT suitable for:

  • Measuring significant fat loss or muscle gain that occurs rapidly.
  • Non-conventional weight loss methods and innovative nutritional approaches which may result in rapid fat loss/muscle gain and affect electrolyte balances, total body water and body temperature.
  • Monitoring changes in body composition produced through cleansing or detoxification programs.

Among the research I have collected and reviewed in my article is:
Indirect estimates of body composition are useful for groups but unreliable in individuals
Int J Obes Relat Metab Disord. 2000 Sep; 24(9):1145-52.

Validity of bioelectrical-impedance analysis in measuring changes in lean body mass during weight reduction.
Am J Clin Nutr. 1991 Dec;54(6):970-5.

Changes in fat-free mass in obese subjects after weight loss: a comparison of body composition measures.
Int J Obes Relat Metab Disord. 1992 Sep; 16(9):675-83.

Accuracy of bioelectrical impedance spectroscopy in measuring changes in body composition during severe weight loss. JPEN J Parenter Enteral Nutr. 2002 Mar-Apr;26(2):120-7.

Skin temperature and skin blood flow affect bioelectric impedance study of female fat-free mass.
Med Sci Sports Exerc. 2000 Jan;32(1):221-7.

Impact of total body water fluctuations on estimation of body fat from body density.
Med Sci Sports Exerc. 1989 Feb;21(1):96-100.

Bioelectrical Impedance Analysis in Body Composition Measurement
National Institutes of Health, Technology Assessment Conference, December 1994


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