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Lifestyle disease

Lifestyle disease is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lifestyle disease rather than just read about it. In short: Lifestyle diseases can be defined as the diseases linked to the manner in which a person lives their life. These diseases are non-communicable, and can be caused by lack of physical activity, unhealthy eating, alcohol, substance use disorders and smoking tobacco, which can lead to heart disease, stroke, obesity, type II diabetes and lung cancer.

Lifestyle disease — main illustration
Lifestyle disease — illustration

Key takeaways

  • Lifestyle disease belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Lifestyle disease to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Lifestyle disease from memory before moving on to harder problems.

Reference excerpt

Lifestyle diseases can be defined as the diseases linked to the manner in which a person lives their life. These diseases are non-communicable, and can be caused by lack of physical activity, unhealthy eating, alcohol, substance use disorders and smoking tobacco, which can lead to heart disease, stroke, obesity, type II diabetes and lung cancer. The diseases that appear to increase in frequency as countries become more industrialized and people live longer include Alzheimer's disease, arthritis, atherosclerosis, asthma, cancer, chronic liver disease or cirrhosis, chronic obstructive pulmonary disease, colitis, irritable bowel syndrome, type 2 diabetes, heart disease, hypertension, metabolic syndrome, chronic kidney failure, osteoporosis, PCOD, stroke, depression, obesity and vascular dementia. Concerns were raised in 2011 that lifestyle diseases could soon have an impact on the workforce and the cost of health care. Treating these non-communicable diseases can be expensive. It can be critical for the patient's health to receive primary prevention and identify early symptoms of these non-communicable diseases. These lifestyle diseases are expected to increase throughout the years if people do not improve their lifestyle choices. Some commenters maintain a distinction between diseases of longevity and diseases of civilization or diseases of affluence. Certain diseases, such as diabetes, dental caries and asthma, appear at greater rates in young populations living in the "western" way; their increased incidence is not related to age, so the terms cannot accurately be used interchangeably for all diseases.

Causes

Diet and lifestyle are major factors thought to influence susceptibility to many diseases. Substance use disorders, such as tobacco smoking, excessive consumption of alcohol, and a lack of or too much exercise may also increase the risk of developing certain diseases, especially later in life. In many Western countries, people began to consume more meat, dairy products, vegetable oils, tobacco, sugary foods, sugary beverages, and alcoholic beverages during the latter half of the 20th century. People also developed sedentary lifestyles and greater rates of obesity. Rates of colorectal, breast, prostate, endometrial and lung cancer started increasing after this dietary change. People in developing countries, whose diets still depend largely on low-sugar starchy foods with little meat or fat have lower rates of these cancers. Causes are not just from smoking tobacco and alcohol use; adults can develop lifestyle diseases through behavioral factors that impact them. Behavioral factors including unemployment, unsafe life, poor social environment, working conditions, stress and home life can increase their risk of developing one of these non-communicable diseases.

Death statistics in Australia Between 1995 and 2005, 813,000 Australians were hospitalized due to alcohol. In 2014, 11.2 million Australians were overweight or obese. In 2013, there were 147,678 deaths within Australia mostly from lifestyle diseases. Smoking tobacco, alcohol use and other substances, violence, and unhealthy weight have impacted the Australians' death rate. The leading cause of death of Australian males was heart disease with 11,016 deaths, followed by lung cancer with 4,995 deaths, and chronic pulmonary disease killing 3,572. All these conditions were mainly attributed to smoking, excessive alcohol use or an unhealthy lifestyle. In 2013, coronary heart disease was the leading cause of death in 8,750 women, mainly as a result of their lifestyle. Dementia and Alzheimer's disease came second, affecting 7,277 females and thirdly, cerebrovascular disease, killing 6,368. These top three causes of deaths could be minimized through lifestyle changes within the Australian population. The table shows the ages of people dying and the top five diseases for which they are dying.

Death statistics in the United States In 1900, the top three causes of death in the United States were pneumonia/influenza, tuberculosis, and diarrhea/enteritis. Communicable diseases accounted for about 60 percent of all deaths. In 1900, heart disease and cancer were ranked number four and eight, respectively. Since the 1940s, the majority of deaths in the United States have resulted from heart disease, cancer, and other degenerative diseases. By the late 1990s, degenerative diseases accounted for more than 60 percent of all deaths. Lifestyle diseases have their onset later in an individual's life; they appear to increase in frequency as countries become more industrialized and people live longer. This suggests that the life expectancy at birth of 49.24 years in 1900 was too short for degenerative diseases to occur, compared to a life expectancy at birth of 77.8 years in 2004. Also, survivorship to the age of 50 was 58.5% in 1900, and 93.7% in 2007.

Death statistics in India According to a report published by the Indian Council of Medical Research in 2017, 3 of the 5 leading individual causes of disease burden in India were non-communicable, with ischemic heart disease and chronic obstructive pulmonary disease as the top two causes and stroke as the fifth leading cause. The range of disease burden or DALY rate among the states in 2016 was 9-fold for ischemic heart disease, 4-fold for chronic obstructive pulmonary disease, 6-fold for stroke, and 4-fold for diabetes across India. Of the total deaths from major disease groups, 62% of all deaths were caused by non-communicable diseases.

… excerpt ends here. Continue reading the full article.

Illustrations

Lifestyle disease: Tobacco smoking can lead to lung cancer, considered a lifestyle disease.
Tobacco smoking can lead to lung cancer, considered a lifestyle disease.
Lifestyle disease: The 6 pillars of lifestyle medicine.
The 6 pillars of lifestyle medicine.

Worked examples

Example 1 — a first encounter with Lifestyle disease

Start with the simplest possible case. Write down what Lifestyle disease claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lifestyle disease before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lifestyle disease ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lifestyle disease

In research
Lifestyle disease appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Lifestyle disease in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Lifestyle disease is common in secondary-school and first-year university syllabi. It links to neighbouring topics Concepts in alternative medicine, Diseases and disorders, Human diseases and disorders, so understanding it makes those chapters shorter.
In everyday life
Look for Lifestyle disease outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Lifestyle disease in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Lifestyle disease means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Lifestyle disease out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lifestyle disease in simple terms?

Lifestyle diseases can be defined as the diseases linked to the manner in which a person lives their life. These diseases are non-communicable, and can be caused by lack of physical activity, unhealthy eating, alcohol, substance use disorders and smoking tobacco, which can lead to heart disease, st…

Why does Lifestyle disease matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lifestyle disease?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lifestyle disease.

Tags

  • Concepts in alternative medicine
  • Diseases and disorders
  • Human diseases and disorders
  • Lifestyle
  • Public health

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