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Scientific Publications

For more than 27 years, Dr. Hans Diehl's Complete Health Improvement Program (CHIP) (formerly Coronary Health Improvement Project) has helped more than 70,000 people to rediscover their health by preventing, arresting, and reversing their diseases. The CHIP program is an engaging, highly entertaining 32-hour scientific journey into the causes and consequences of our present "state of health" in Western societies.

Piloted in communities throughout North America, and with results published in more than 33+ scientific and medical journals, CHIP is making a difference. CHIP will not only show you why we need to make better lifestyle choices but also how to stop the "good life" from killing us. CHIP establishes the principle of health as an absolute necessity rather than a trendy option. It is not natural to be obese and hypertensive, have high cholesterol and triglycerides, and to suffer from diabetes, constipation, heartburn, angina, and heart disease.

Scroll down and click on the links below to download scientific publications and related articles about CHIP.

AOA_logoThe Journal of the American Osteopathic Association
May 2017, Vol. 117, 293-300.doi;10.7556/jaoa.2017.054
Cassady Remy, BA; Jay H. Shubrook, DO; Masato Nakazawa, PhD; David Drozek, DO

Employer-Funded Complete Health Improvement Program: Preliminary Results of Biomarker Changes
When funded by an employer, CHIP demonstrated short-term improvements in select metabolic and cardiovascular biomarkers. Future studies will analyze these data to determine whether these findings translate into subsequent decreased employee absenteeism and reduced beneficiary health claims.

AJMC logoThe American Journal of Managed Care
Volume 21, No. 9, 6 pages
Joseph Vogelgesang, BS; David Drozek, DO; Masato Nakazawa, PhD; Jay H. Shubrook, DO

Payer Source Influence on Effectiveness of 

Lifestyle Medicine Programs


Take-Away Points:
  • Participants that receive funding for the Complete Health Improvement Program (CHIP) through a third-party source (scholarship or employer) experience similar reduction in chronic disease risk factors as those that pay out of pocket.
  • Poverty-stricken regions like Appalachia have a greater burden of chronic diseases; thus, it is advantageous to provide funding for those in financial need to attend lifestyle intervention programs.
  • With healthcare costs escalating and assistance for the poor decreasing, there is a need for accessible, cost-effective programs that produce sustained health benefits.
  • The results from this study suggest that participants, regardless of their socioeconomic status, could potentially benefit from CHIP.

Full article (PDF file)

American Journal of Lifestyle Medicine

American Journal of Lifestyle Medicine
Apr 2014
     Darren Morton, Paul Rankin, Lillian Kent and Wayne Dysinger

“The Complete Health Improvement Program (CHIP): History, Evaluation, and Outcomes”

Advances in Preventive MedicineAdvances in Preventive Medicine
Volume 2014, Article ED798184, 7 pages
David Drozek, Hans Diehl, Masato Nakazawa, Tom Kostohryz, Darren Morton and Jay H. Shubrook

Short-Term Effectiveness of a Lifestyle Intervention Program for Reducing Selected Chronic Disease Risk Factors in Individuals Living in Rural Appalachia: A Pilot Cohort Study"

Full article (PDF file)

BMJ OpenBMJ Open (British Medical Journal)
2013;3:e003751 doi:10.1136/bmjopen-2013-003751
Lillian Kent, Darren Morton, Trevor Hurlow, Paul Rankin, Althea Hanna, Hans Diehl. 

Long-term effectiveness of the community-based Complete Health Improvement Program (CHIP) lifestyle intervention: a cohort study"

Paper is available at: http://bmjopen.bmj.com/cgi/content/full/bmjopen-2013-003751

Nutrition & Metabolism logoNutrition & Metabolism
Lillian Kent, Darren Morton, Paul Rankin, Ewan Ward, Ross Grant, John Gobble, and Hans Diehl. 

The effect of a low-fat, plant-based lifestyle intervention (CHIP) on serum HDL levels and the implications for metabolic syndrome status - a cohort study 

Paper is available at: http://www.nutritionandmetabolism.com/content/10/1/58

NZMA logo
The New Zealand Medical Journal

March 2013, Vol 126, No 1370, ISSN 11758716


Darren P Morton, Paul Rankin, Peter Morey, Lillian Kent, Trevor Hurlow, Esther Chang, Hans Diehl 

The effectiveness of the Complete Health Improvement Program (CHIP) in Australasia for reducing selected chronic disease risk factors: a feasibility study”

The American Journal of Managed CareJournal of Managed Care Medicine
Vol 15, No. 4, 2012
Dexter Shurney, MD, MBA, MPH; Sandra Hyde, MSPS; Kristina Hulsey, MSPS

“CHIP Lifestyle Program at Vanderbilt University Demonstrates an Early ROI for a Diabetic Cohort in a Workplace Setting: A Case Study”

IntechOpen logo
IntechOpen: Open Science, Open Minds
Oct 2012 
     Heike S. Englert, Hans A. Diehl, Roger L. Greenlaw, and Steve Aldana

“The Effects of Lifestyle Modification on Glycemic Levels and Medication Intake: The Rockford CHIP”

American Journal of Lifestyle MedicineAmerican Journal of Lifestyle Medicine
Dec 2011
     Kate Marsh, Carol Zeuschner, and Angela Saunders

“Health Implications of a Vegetarian Diet: A Review”

The American Journal of CardiologyAmerican Journal of Cardiology
Jan 2012
     Rankin P, Morton DP, Diehl HA, Gobble J, Morey P, Chang E.

“Effectiveness of a Volunteer-Delivered Lifestyle Modification Program for Reducing Cardiovascular Disease Risk Factors.”

Ammons Scientific logoPsychological Reports
2011, 109, 1, 338-352
     Thieszen CL, Merrill RM, Aldana SG, Diehl HA, Mahoney ML, Roger LG, Vermeersch DA, Englert H

"The Coronary Health Improvement Project (CHIP) for Lowering Weight and Improving Psychosocial Health"


The New York Academy of Medicine logoTrust for America's Health logo

September 2009 

"A Compendium of Proven Community-based Prevention Programs"

     Abstract (ROI of $5.60 for every $1 spent)
     Full article (PDF)

American Journal of Health Education logoAmerican Journal of Health Education
November/December 2008 • Volume 39, No. 6
     Merrill RM, Aldana SG, Greenlaw RL, Diehl HA

"The Coronary Health Improvement Projects Impact on Lowering Eating, Sleep, Stress, and Depressive Disorders"

     Full article (PDF)


CDC logoPreventing Chronic Disease
January 2008 • Volume 5, No.1
     Merrill RM, Aldana SG, Greenlaw RL, Diehl HA, Salberg A, Englert H

"Can Newly Acquired Healthy Behaviors Persist? An Analysis of Health Behavior Decay"

     Full article (PDF)

Preventive Medicine logoPreventive Medicine
2008; 46 (4): 425-430
     Merrill RM, Massey MT, Aldana SG, Greenlaw RL, Diehl HA, Salberg A

"C-reactive Protein Levels According to Physical Activity and Body Weight for Participants in the Coronary Health Improvement Project"

Preventive Medicine logoPreventive Medicine
June 2007; 44(6):513-9
     Englert A, Greenlaw RL, Diehl HA, Willich SN, Aldana SG

"The Effect of a Community-based Coronary Risk Reduction: the Rockford CHIP"

The Journal of Nutrition, Health and Aging logoJournal of Nutrition Health Aging
May 2007, 11(3):242-248
     Merrill RM, Aldana SG, Greenlaw RL, Diehl HA, Salberg A

"The Effects of an Intensive Lifestyle Modification Program on Sleep and Stress Disorders"

Health Education Research logoHealth Education Research
2008 February; 23(1):115-24. Epub 2007 Mar 8.
     Aldana S, Greenlaw RL, Diehl HA, Merrill RM, Salberg A, Englert H

"A Video-based Lifestyle Intervention and Changes in Coronary Risk"

     Abstract     Full Article
CDC logoPreventing Chronic Disease
January 2006 • Volume 3, No.1:A05-17
     Aldana SG, Greenlaw RL, Diehl HA, Salberg A, Merrill RM, Ohmine S, Thomas C

"The Behavioral and Clinical Effects of Therapeutic Lifestyle Change on Middle-aged Adults"

     Full article (PDF)
Journal of Occupational and Environmental Medicine logoJournal of Occupational & Environmental Medicine
June 2005 • Volume 47• Number 6:558-564
     Aldana SG, Greenlaw RL, Diehl HA, Salberg A, Merrill RM, Ohmine S

"The Effects of a Worksite Chronic Disease Prevention Program" 

     Full article (PDF)
Journal of the American Dietetic Association logoJournal of the American Dietetic Association
March 2005 • Volume 105 • Number 3:371-381
     Aldana SG, Greenlaw RL, Diehl HA, Salberg A, Merrill RM, Ohmine S, Thomas C

"Effects of an intensive diet and physical activity modification program on the health risks of adults"

     Full article (PDF)
     WORD document
Preventive Medicine logoPreventive Medicine
April 2004, 38:4, 432-441
     Englert H, Greenlaw RL, Diehl HA

"Rationale & Design of the Rockford CHIP, a community-based coronary risk reduction program: Results of a pilot phase"

     Full article (PDF)
Journal of Occupational and Environmental Medicine logoJournal of Occupational & Environmental Medicine
2002; 44:831-9)
     Steven Aldana, PhD, Roger Greenlaw, MD, Hans Diehl, DrHSc et al

"Impact of the Coronary Health Improvement Project (CHIP) on Several Employee Populations"

    Full article (PDF file)

The American Journal of CardiologyAmerican Journal of Cardiology
1998; 82:83-7T
     Hans Diehl, DrHSc

"Coronary Risk Reduction through Intensive Community-Based Lifestyle Intervention: The CHIP Experience"

     Full article (PDF file)
Nutrition Action logoNutrition Action
Center for Science in the Public Interest
Oct. 2005
       Michael F. Jacobson, PhD

"Saving 400 at a Time"

    Full article (PDF file)
     David Hunnicutt, PhD, Hans Diehl, DrHSc, Roger Greenlaw, MD, Peter Vedro, MAT (in a national health publication by WELCOA)

"The CHIP Prescription for Health"

     Full article (PDF file)
Evaluation of CHIP (May 2005) Conducted at Perth, Australia
The Perth Cohort
     Prepared by Heike Englert, PhD, MPH, with Hans Diehl, DrHSc, MPH

     Full article (PDF file)
     WORD document
Washington Business Group on Health
June 2003

"Best Practices and Strategies for Weight Management: A toolkit for Large Employers"

     Full article (PDF file)
Preventive Cardiology
2001, 171-7
     Caldwell Esseltyn, MD, Cleveland Clinic

"Eliminating Heart Disease"

     Full article (PDF file)
51:10, 2000; 817-26
     Richard Fleming, MD

"Effect of High-Protein Diets on Coronary Blood Flow"

     Summary (PDF file)
Nutrition & Health
2003; Vol 17, 55-60
     Allan Withnell, MD

"The Natural Cure of Coronary Heart Disease"

     Full article (PDF file)