Home

Incidence and prevalence of chronic disease

The last half century has seen a steady increase in the incidence and prevalence of chronic inflammatory diseases with further increases expected. According to the Marshall Pathogenesis, a number of factors are to blame:

  • misuse of antibiotics especially Beta-lactam antibiotics
  • vitamin supplementation including folic acid but especially vitamin D
  • novel vectors for sharing pathogens including blood donation
  • widespread adoption of compulsory mass vaccinations

Historical increases in the prevalence of certain chronic diseases

Manifestations of both arteriosclerosis1) 2) and cardiac disease3) can be observed in mummies of ancient Egypt. Ötzi the Neolithic Iceman who lived around 3300 BC was found to have arthritis.4) Yet, it is only recently that rates of certain chronic diseases have appeared to escalate.

At the beginning of the twentieth century, infectious diseases were the leading cause of death worldwide. In the United States, three diseases — tuberculosis, pneumonia, and diarrhoeal disease — caused 30% of deaths.5) By the end of the twentieth century, in most of the developed world, mortality from infectious diseases had been replaced by mortality from chronic illnesses such as heart disease, cancer and stroke.6)

While many researchers have argued7) 8) that most chronic diseases are not caused by infection, a broad array of evidence suggests otherwise.

25% of Americans have more than one chronic condition.

Current prevalence of chronic disease in the United States

In 2000, approximately 125 million Americans (45% of the population) had chronic conditions and 61 million (21% of the population) had multiple chronic conditions.9)

According to a 2004 report:

In 2004, almost half of all Americans, or 133 million people, live with a chronic condition. … People with chronic conditions account for 83 percent of health care spending and those with five or more chronic conditions have an average of almost fifteen physician visits and fill over 50 prescriptions in a year.

Partnership for Solutions National Program Office, Robert Wood Johnson Foundation

Projected increase in prevalence of chronic diseases

Chronic diseases are the largest cause of death in the world. In 2002, the leading chronic diseases—cardiovascular disease, cancer, chronic respiratory disease, and diabetes—caused 29 million deaths worldwide.10) Worldwide annual mortality due to chronic disease is expected to increase in real numbers as well as relative to deaths from injuries and diseases traditionally understood to be infectious such as polio, rubella, tuberculosis, etc.

In the United States, the number of people with chronic conditions is projected to increase steadily for the next 30 years.11) Partnership for Solutions National Program Office estimates that it will reach 157 million by 2010 while another estimate says that figure will be 140 million.

Specific diseases

Obesity

One team concluded in a recent meta-analysis that if Americans keep gaining weight at the current rate, 75 percent of U.S. adults will be overweight and 41 percent obese by the year 2015.

A progressive leftward shift in age of onset of the childhood disease has been and continues to be observed in the United Kingdom. This trend in a progressively earlier onset of diabetes is consistent with data from other countries. Source: Gale

Obesity is likely to continue to increase, and if nothing is done, it will soon become the leading preventable cause of death in the United States.

Youfa Wang, MD, PhD 12)

One 2002 paper concluded that “the prevalence of obesity is increasing globally, with nearly half a billion of the world’s population now considered to be overweight or obese.”13)

Diabetes

In a 2002 paper, Edwin Gale concluded that the incidence of childhood diabetes (type I diabetes) began to steadily increase at almost the same time – from the 1950s onwards.14) This increase had been identified in a range of developed countries including the United States, Sardinia, and Northern Europe.15)

According to a 2009 paper in Diabetes care, the number of people with diabetes in the United States is expected to double over the next 25 years. That would bring the total by 2034 to about 44.1 million people with the disease, up from 23.7 million today.

Low levels of 25-D as a proxy for disease

Members of societies that do not supplement their food chains with vitamin D have naturally low levels of 25-hydroxyvitamin D (25-D).16) 17) However when whole populations are given large amounts of vitamin D, the only members of that population who remain “deficient” are those whose immune systems are fighting disease by actively downregulating 25-D. In other words, the more rigorously vitamin D is added to milk, juice, snack bars, and breakfast cereals, the less likely it is that someone has low levels of vitamin D but no chronic disease.

For this reason, data which identifies vitamin D “deficiency” is actually pointing to incidence of disease. In a 2009 paper, Saintonge et al showed that the prevalence of low levels of 25-D - and therefore the rate of chronic disease - is between 2% and 14% among a cohort of 2,955 Americans 12 to 19 years of age.18)

Using data from the National Health and Nutrition Examination Survey III, Saintonge et al found that a significant proportion of American adolescents had low levels of 25-D.

According to Dr. Roger Bouillon of the University of Leuven, “over one billion” people worldwide have vitamin D “deficiency.”19)

The accuracy of this estimate is debatable. If this figure includes those populations that do not supplement with vitamin D, Dr. Bouillon's figure may be an overestimate: healthy people who do not supplement with vitamin D have naturally low levels of 25-D. However, it does seem likely that a large fraction of the world's population suffers from chronic disease of one kind or another.

A study published in 2008, controlling for age and other factors, found that Americans' serum levels of 25-D declined “5-9 nmol/L” in 1988-1994 as compared to 2000-2004 in most males, but not in most females.20)

Factors driving recent increases in chronic disease

While it has been widely hypothesized that lifestyle factors, including a poor diet and a lack of exercise, are driving what the World Health Organization has termed “an obesity epidemic,” even the most ambitious obesity intervention programs, which have gone to great lengths to increase rates of exercise and improve eating habits of a population, have been failures.21) 22)

Instead, there is growing evidence that chronic diseases are not due to predominantly lifestyle factors. A number of factors have contributed to the creation of an epidemic of Th1 inflammatory diseases.

Misuse of antibiotics

"Vitamin" supplementation

  • Vitamin D supplementation of baby food and also of the general food chain.
  • The rise of the sun-loving culture in the 50s. Prior to the bikini, it was not so fashionable for the young to sunbathe excessively
  • Supplementation with folic acid

Use of other immunomodulatory or immunosuppressive agents

  • Routine interference with immune reactions: anti-infammatories, anti-bacterials, corticosteroids, TNF-alpha drugs, etc.

Novel vectors for sharing pathogens

  • Widespread adoption of compulsory mass vaccinations – although evidence for this is still preliminary
  • Blood transfusions especially in elective surgery

War

War offers a number of circumstances which contribute to the incidence and prevalence of chronic disease as evidenced by epidemiological studies. Circumstances include:

  • Acquisition of new pathogens
  • Physical trauma and stress
  • Psychological stress

Perhaps it is more than coincidence that those diseases for which there is a demonstrated association with war – cancers, hypertension, obesity, and many of the other forms of cardiovascular disease – saw an increase in the aftermath of World War II, particularly in the United States. Given the discrepancy with which the genders have traditionally enlisted, it would be speculative to suggest that war plays a role in the onset of predominantly “male” chronic diseases, but that possibility may be worth further study.

Read more:

References

1) Azer SA Arterial disease in antiquity. Med J Aust. 1999;171:280.
2) Ackerknecht, E. H. (1955). A Short History of Medicine. New York: Ronald Press
3) Miller R, Callas DD, Kahn SE, Ricchiuti V, Apple FS Evidence of myocardial infarction in mummified human tissue. JAMA. 2000;284:831-2.
4) Dickson JH, Oeggl K, Handley LL The iceman reconsidered. Sci Am. 2003;288:70-9.
5) Centers for Disease Control and Prevention. 1994 Fact Book, 7 (CDC, Atlanta, 1994).
6) , 8) Cohen ML Changing patterns of infectious disease. Nature. 2000;406:762-7.
7) Sigerist, H. E. The Great Doctors 372 (Dover Publications, New York, 1971).
9) , 11) Anderson G, Horvath J The growing burden of chronic disease in America. Public Health Rep. 2004;119:263-70.
10) Yach D, Hawkes C, Gould CL, Hofman KJ The global burden of chronic diseases: overcoming impediments to prevention and control. JAMA. 2004;291:2616-22.
13) Rössner S Obesity: the disease of the twenty-first century. Int J Obes Relat Metab Disord. 2002;26 Suppl 4:S2-4.
15) Krolewski AS, Warram JH, Rand LI, Kahn CR Epidemiologic approach to the etiology of type I diabetes mellitus and its complications. N Engl J Med. 1987;317:1390-8.
16) González G, Alvarado JN, Rojas A, Navarrete C, Velásquez CG, Arteaga E High prevalence of vitamin D deficiency in Chilean healthy postmenopausal women with normal sun exposure: additional evidence for a worldwide concern. Menopause. 2007;14:455-61.
17) Islam MZ, Akhtaruzzaman M, Lamberg-Allardt C Hypovitaminosis D is common in both veiled and nonveiled Bangladeshi women. Asia Pac J Clin Nutr. 2006;15:81-7.
19) Boullion, R. (2006 April 2). Vitamin D analogues: pharmacology and therapeutic uses. European Congress of Endocrinology, Glasgow.
20) Looker AC, Pfeiffer CM, Lacher DA, Schleicher RL, Picciano MF, Yetley EA Serum 25-hydroxyvitamin D status of the US population: 1988-1994 compared with 2000-2004. Am J Clin Nutr. 2008;88:1519-27.
21) Caballero B, Clay T, Davis SM, Ethelbah B, Rock BH, Lohman T, Norman J, Story M, Stone EJ, Stephenson L, Stevens J Pathways: a school-based, randomized controlled trial for the prevention of obesity in American Indian schoolchildren. Am J Clin Nutr. 2003;78:1030-8.
22) Reilly JJ, Kelly L, Montgomery C, Williamson A, Fisher A, McColl JH, Lo Conte R, Paton JY, Grant S Physical activity to prevent obesity in young children: cluster randomised controlled trial. BMJ. 2006;333:1041.
home/pathogenesis/epidemiology.txt · Last modified: 01.29.2010 (external edit)
© 2010, Autoimmunity Research Foundation. All Rights Reserved.