Obesity Surgery

, Volume 26, Issue 10, pp 2379–2383 | Cite as

Stability of Metabolic Factor Before and After Bariatric Surgery

  • Brandon DavisEmail author
  • Joseph Indelicato
Original Contributions



A new metric called metabolic factor (resting metabolic rate/weight) has previously been established that can differentiate between people who are obese, overweight, and of normal weight. Previous studies were re-analyzed and found that people who lost weight did not experience a change in their metabolic factor.

Materials and Methods

The current study measured the metabolic factor of 18 individuals before and after bariatric surgery.


As expected, individuals lost nearly 100 lb and therefore lowered their resting metabolic rate from 2614.3 to 1954.4 kcal (p < 0.05). However, the pre-operative metabolic factor of 8.1 (1.1) cal/lb did not change significantly as it slightly increased to 8.6 (0.88) after surgery (p = 0.19). Weight loss was not statistically significantly correlated with change in metabolic factor (r = 0.22). The follow-up metabolic factor negatively correlated with post-operative BMI, r = −0.48 (p < 0.05), indicating the higher the metabolic factor, the lower the post-operative BMI.


This study seems to establish the possibility that metabolic factor is not simply a function of one’s current weight, but instead might be a stable characteristic unique to each individual.


Metabolic factor Bariatric surgery Obesity 



The authors would like to thank Stephen Phillips for his consultation.

Compliance with Ethical Standards

Conflict of Interest

Funding for this study was obtained from the American Association of Bariatric Counselors. However, this funding had no impact on the results. Neither Dr. Davis nor Dr. Indelicato has any conflicts of interest.

Ethical Approval

All procedures performed in this study were in accordance with the ethical standards of Touro College and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.


  1. 1.
    Frankenfield D, Roth-Yousey L, Compher C. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc. 2005;105(5):775–89.CrossRefPubMedGoogle Scholar
  2. 2.
    Muller M, Bosy-Westphal A, Klaus S, et al. World Health Organization equations have shortcomings for predicting resting energy expenditure in persons from a modern, affluent population: generation of a new reference standard from a retrospective analysis of a German database of resting energy expenditure. Am J Clin Nutr. 2004;80:1379–90.PubMedGoogle Scholar
  3. 3.
    Davis B, Indelicato J, Joonas N, et al. Metabolic factor: a new clinical tool in obesity diagnosis and weight management. Arch Med Biomed Res. 2014;1(2):47–53.Google Scholar
  4. 4.
    Heshka S, Yang M, Wang J, et al. Weight loss and change in resting metabolic rate. Am J Clin Nutr. 1990;52:981–6.PubMedGoogle Scholar
  5. 5.
    Del Genio F, Alfonsi L, Marra M, et al. Metabolic and nutritional status changes after 10% weight loss in severely obese patients treated with laparoscopic surgery vs integrated medical treatment. Obes Surg. 2007;17:1592–8.CrossRefPubMedGoogle Scholar
  6. 6.
    Thomas A, Holden J, Chezem J. Body composition and energy expenditure changes during weight loss: an exploratory study. Food Nutr Sci. 2012;3:153–6.CrossRefGoogle Scholar
  7. 7.
    Ravussin E, Lillioja S, Knowler W, et al. Reduced rate of energy expenditure as a risk factor for body-weight gain. N Engl J Med. 1988;318(8):467–72.CrossRefPubMedGoogle Scholar
  8. 8.
    Compher C, Frankenfield D, Keim N, et al. Best practice methods to apply to measurement of resting metabolic rate in adults: a systematic review. J Am Diet Assoc. 2006;106(6):881–903.CrossRefPubMedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Davis Psychological Services, PCGrinnellUSA

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