LSD QP ANSWER AM-2025

 

APR/MAY 2025

OBT356 – LIFESTYLE DISEASES

PART A-(10 x 2=20 marks) answers

1. Define lifestyle diseases:
   Lifestyle diseases are health conditions primarily caused by unhealthy habits and behaviors, such as poor diet, lack of physical activity, smoking, and excessive alcohol consumption.
2. List any two risk factors for obesity:
   Two risk factors for obesity include poor dietary habits (e.g., high calorie intake) and lack of physical activity.
3. What is the main cause of skin cancer?
   The main cause of skin cancer is prolonged exposure to ultraviolet (UV) radiation from the sun or tanning beds.
4. Name two biomarkers used in cancer diagnosis:
   Two biomarkers used in cancer diagnosis are Carcinoembryonic Antigen (CEA) and Prostate-Specific Antigen (PSA).
5. What is coronary artery disease?
   Coronary artery disease (CAD) is a condition where the coronary arteries become narrowed or blocked due to the build-up of fatty deposits, reducing blood flow to the heart.
6. Mention two causes of atherosclerosis:
   Two causes of atherosclerosis are high cholesterol levels and smoking.
7. What are the complications of diabetes mellitus?
   Complications of diabetes mellitus include heart disease, kidney failure, nerve damage, and poor wound healing.
8. How is BMI used to assess obesity?
   BMI (Body Mass Index) is used to assess obesity by calculating an individual's weight in relation to their height, with a BMI of 30 or above indicating obesity.
9. What is pulmonary function testing?
   Pulmonary function testing is a set of tests used to measure the function of the lungs, assessing airflow and the volume of air a person can inhale and exhale.
10. List two causes of chronic lung disease:
    Two causes of chronic lung disease include smoking and exposure to air pollutants.

11. (a) Relate the role of diet and exercise in preventing lifestyle diseases.

Lifestyle diseases such as obesity, type 2 diabetes, cardiovascular diseases, hypertension, and certain cancers are primarily caused by poor lifestyle habits like unhealthy eating, physical inactivity, smoking, and excessive alcohol use. Among these factors, diet and exercise play a crucial role in both prevention and management of such conditions.

1. Role of Diet in Preventing Lifestyle Diseases:

A balanced and nutritious diet provides the body with essential nutrients and maintains healthy body functions. Proper dietary habits help in the following ways:

• Maintains healthy weight: Consuming a diet rich in whole grains, fruits, vegetables, lean proteins, and healthy fats helps prevent obesity, a major risk factor for lifestyle diseases.
• Controls blood sugar levels: Low glycemic index foods and complex carbohydrates help regulate blood glucose levels, reducing the risk of type 2 diabetes.
• Reduces cholesterol and blood pressure: Diets low in saturated fats, trans fats, and sodium help lower the risk of hypertension and cardiovascular diseases.
• Provides antioxidants: Fruits and vegetables contain antioxidants that protect against cell damage, reducing the risk of certain cancers and inflammatory diseases.
• Improves digestion and gut health: A diet high in fiber aids in digestion and supports a healthy gut microbiome.

2. Role of Exercise in Preventing Lifestyle Diseases:

Regular physical activity enhances overall health and lowers the risk of chronic conditions. Benefits include:

• Improved cardiovascular health: Exercise strengthens the heart and improves circulation, reducing the risk of heart disease.
• Weight management: Physical activity burns calories and boosts metabolism, helping to prevent obesity.
• Enhanced insulin sensitivity: Exercise improves the body’s ability to use insulin, reducing the risk of diabetes.
• Stronger muscles and bones: Weight-bearing and resistance exercises improve musculoskeletal health, preventing conditions like osteoporosis.
• Mental well-being: Physical activity reduces stress, anxiety, and depression, which are often linked to lifestyle disorders.
• Boosts immunity: Regular exercise helps in maintaining a healthy immune system, making the body more resistant to illnesses.

11 (b): Examine the impact of smoking on cardiovascular health.

Smoking has a significant and harmful impact on cardiovascular health, and is one of the leading preventable causes of heart disease and stroke. The chemicals in tobacco smoke damage the heart, blood vessels, and blood cells, increasing the risk of various cardiovascular conditions.

1. Effects on Blood Vessels and Heart Function:

·         Atherosclerosis: Smoking damages the inner lining of arteries, promoting the build-up of fatty deposits (plaque), which leads to narrowing and hardening of arteries (atherosclerosis).

·         Increased Blood Pressure and Heart Rate: Nicotine in cigarettes stimulates the nervous system, causing a rise in heart rate and blood pressure, which increases the workload on the heart.

·         Reduced Oxygen Supply: Carbon monoxide in smoke binds with hemoglobin more readily than oxygen, reducing oxygen delivery to heart muscles and tissues.

2. Increased Risk of Cardiovascular Diseases:

·         Coronary Artery Disease (CAD): Smokers are 2 to 4 times more likely to develop CAD, which can lead to chest pain, heart attacks, and even sudden cardiac death.

·         Stroke: Smoking contributes to the formation of blood clots and increases the risk of ischemic and hemorrhagic stroke.

·         Peripheral Arterial Disease (PAD): Reduced blood flow to the limbs due to narrowed arteries causes pain, ulcers, and in severe cases, gangrene.

·         Aneurysms: Smoking weakens the walls of blood vessels, increasing the risk of aneurysm (e.g., abdominal aortic aneurysm).

3. Other Cardiovascular Impacts:

·         Increased blood clotting tendency: Smoking promotes platelet aggregation, which can lead to clot formation and blocked arteries.

·         Adverse lipid profile: It reduces good HDL cholesterol and increases bad LDL cholesterol levels.

 

12 (a): Determine the causes and diagnosis of cervical cancer.

Cervical cancer is a malignant tumor of the cervix, the lower part of the uterus. It is one of the most common cancers affecting women, especially in low- and middle-income countries.

1. Causes of Cervical Cancer:

·         Human Papillomavirus (HPV) Infection: The most significant cause, particularly high-risk types like HPV-16 and HPV-18, which are responsible for about 70% of cervical cancer cases.

·         Early sexual activity and multiple partners: Increases the risk of HPV transmission.

·         Smoking: Tobacco use increases the risk of cervical cancer by affecting the immune system and damaging cervical cells.

·         Weakened immune system: Conditions like HIV/AIDS lower the body’s ability to fight HPV infections.

·         Long-term use of oral contraceptives: Studies suggest a slight increase in risk with prolonged use.

·         Poor genital hygiene and lack of screening: Increase risk due to undetected precancerous changes.

2. Diagnosis of Cervical Cancer:

·         Pap Smear (Pap Test): A screening test that detects precancerous and cancerous cells in the cervix. It is recommended regularly for women aged 21–65.

·         HPV DNA Test: Detects the presence of high-risk HPV strains in cervical cells.

·         Colposcopy: A visual examination of the cervix using a colposcope when Pap results are abnormal.

·         Biopsy: Tissue samples are taken from the cervix for microscopic examination to confirm the presence of cancer.

·         Imaging Tests (MRI, CT, PET): Used to determine the stage of cancer and detect its spread to other organs.

3. Conclusion:

Early detection through regular screening and HPV vaccination plays a vital role in the prevention and control of cervical cancer. Public awareness and access to healthcare services are essential to reduce incidence and mortality.

 

12 (b): Classify the types of lung cancer and their causes.

Lung cancer is a type of cancer that originates in the lungs. It is one of the leading causes of cancer-related deaths worldwide. Lung cancer is broadly classified into two main types based on the microscopic appearance of tumor cells.

1. Types of Lung Cancer:

(i) Non-Small Cell Lung Cancer (NSCLC) – ~85% of cases

·         Adenocarcinoma: Most common form; often found in non-smokers and younger people. Begins in mucus-producing cells.

·         Squamous Cell Carcinoma: Arises in the central bronchi; strongly associated with smoking.

·         Large Cell Carcinoma: Grows and spreads quickly; can appear in any part of the lung.

(ii) Small Cell Lung Cancer (SCLC) – ~15% of cases

·         More aggressive and spreads rapidly.

·         Strongly associated with smoking.

·         Usually diagnosed at a later stage due to its rapid progression.

2. Causes of Lung Cancer:

·         Tobacco Smoking: The leading cause; responsible for about 85–90% of all lung cancer cases. Cigarette smoke contains carcinogens like benzene, formaldehyde, and arsenic.

·         Secondhand Smoke: Increases risk even in non-smokers.

·         Exposure to Radon Gas: A naturally occurring radioactive gas that can accumulate in buildings.

·         Occupational Exposure: Asbestos, arsenic, and other industrial substances increase risk.

·         Air Pollution: Long-term exposure to polluted air contributes to lung cancer, particularly in urban areas.

·         Genetic Factors: A family history of lung cancer can increase susceptibility.

·         Pre-existing Lung Diseases: Such as chronic obstructive pulmonary disease (COPD) or pulmonary fibrosis.

 

13. (a) Interpret the Causes and Diagnosis of Coronary Artery Disease (CAD)

Causes of Coronary Artery Disease (CAD):

1.      Atherosclerosis:
The primary cause of CAD. It involves the buildup of plaques (fatty deposits) in the coronary arteries, narrowing them and reducing blood flow to the heart.

2.      Dyslipidemia:
Elevated LDL (bad cholesterol) and low HDL (good cholesterol) levels promote plaque formation.

3.      Hypertension:
High blood pressure damages arterial walls, making them more susceptible to plaque buildup.

4.      Smoking:
Cigarette smoke accelerates atherosclerosis and promotes blood clotting.

5.      Diabetes Mellitus:
High blood sugar levels damage blood vessels and increase risk of plaque buildup.

6.      Obesity and Sedentary Lifestyle:
Increase risk of insulin resistance, hypertension, and dyslipidemia.

7.      Genetic Factors:
Family history of heart disease increases risk.

8.      Stress:
Chronic stress may lead to unhealthy behaviors and physiological changes contributing to CAD.

Diagnosis of CAD:

1.      Clinical Symptoms:

o    Chest pain (angina)

o    Shortness of breath

o    Fatigue

o    Palpitations

2.      Electrocardiogram (ECG):
Detects abnormal heart rhythms or past myocardial infarctions.

3.      Echocardiogram:
Visualizes heart function and identifies areas of poor blood flow.

4.      Stress Test:
Evaluates heart function during physical exertion or medication-induced stress.

5.      Coronary Angiography:
Gold standard; uses contrast dye and X-rays to visualize blockages in coronary arteries.

6.      Blood Tests:

o    Cardiac enzymes (e.g., troponin) to assess heart muscle damage

o    Lipid profile to detect risk factors

 

 

 

13. (b) Recall the Role of Lipids in the Development of Atherosclerosis

Introduction:
Lipids, especially cholesterol and triglycerides, play a central role in the pathogenesis of atherosclerosis, the underlying cause of coronary artery disease, stroke, and peripheral arterial disease.

Role of Lipids:

1.      LDL Cholesterol (Low-Density Lipoprotein):

o    Known as “bad cholesterol”

o    Excess LDL penetrates the arterial wall and becomes oxidized

o    Triggers inflammation and attracts macrophages

2.      Foam Cell Formation:

o    Macrophages engulf oxidized LDL, turning into foam cells

o    Foam cells accumulate and form fatty streaks – the earliest lesion of atherosclerosis

3.      Plaque Development:

o    Smooth muscle cells migrate and form a fibrous cap over the fatty core

o    This leads to the development of a mature atherosclerotic plaque

4.      HDL Cholesterol (High-Density Lipoprotein):

o    Known as “good cholesterol”

o    Helps remove excess cholesterol from the bloodstream and plaques

5.      Triglycerides:

o    High levels are associated with small, dense LDL particles

o    Contribute to endothelial dysfunction and inflammation

Other Contributing Factors:

·         Dietary fats (e.g., saturated and trans fats) increase LDL

·         Genetic conditions like familial hypercholesterolemia accelerate lipid accumulation

14. (a) Outline the Process of Blood Glucose Regulation in Diabetes Mellitus

Normal Blood Glucose Regulation:

1.      Insulin Secretion (Post-Meal):

o    Secreted by β-cells of the pancreas

o    Promotes glucose uptake by muscle and adipose tissue

o    Inhibits glucose production in the liver

2.      Glucagon Secretion (Fasting State):

o    Secreted by α-cells of the pancreas

o    Stimulates liver to release stored glucose (glycogenolysis)

o    Promotes gluconeogenesis

Pathophysiology in Diabetes Mellitus:

1.      Type 1 Diabetes:

o    Autoimmune destruction of β-cells

o    Absolute insulin deficiency

o    Leads to hyperglycemia and ketoacidosis

2.      Type 2 Diabetes:

o    Insulin resistance in peripheral tissues

o    Relative insulin deficiency

o    Liver produces excess glucose despite high blood sugar

Hormonal Imbalance:

·         Increased glucagon, cortisol, growth hormone, and catecholamines can worsen hyperglycemia.

Clinical Implications:

·         Elevated blood glucose leads to:

o    Glycosuria

o    Polyuria, polydipsia, and polyphagia

o    Long-term complications: nephropathy, neuropathy, retinopathy, and cardiovascular diseases

14. (b) Discuss the Management of Adolescent Obesity

Introduction:
Adolescent obesity is a growing health concern associated with increased risk of diabetes, hypertension, and psychological issues.

Causes:

·         Poor dietary habits (high-calorie, processed foods)

·         Sedentary lifestyle (screen time, lack of exercise)

·         Genetic predisposition

·         Hormonal imbalances (e.g., hypothyroidism)

·         Psychological factors (stress eating, depression)

Management Strategies:

1.      Dietary Modifications:

o    Reduce intake of sugars and unhealthy fats

o    Increase fruits, vegetables, whole grains

o    Encourage home-cooked meals and portion control

2.      Physical Activity:

o    At least 60 minutes/day of moderate to vigorous activity

o    Limit screen time to <2 hours/day

3.      Behavioral Therapy:

o    Goal setting and self-monitoring

o    Family-based interventions

o    Address body image and self-esteem issues

4.      Medical Management:

o    Only in severe cases or when comorbidities are present

o    May include pharmacotherapy (e.g., orlistat) under supervision

5.      Multidisciplinary Approach:

o    Involves pediatrician, dietitian, psychologist, and family

o    Long-term follow-up and motivation

6.      School and Community Support:

o    Healthy school meals

o    Physical education programs

o    Public health campaigns

 

15. (a) Summarize the Causes and Treatment Options for Asthma

Causes of Asthma:

1.      Genetic Predisposition:
Family history of asthma or allergies increases risk.

2.      Environmental Triggers:

o    Allergens (dust mites, pollen, pet dander)

o    Pollution, smoke, and occupational exposures

3.      Infections:

o    Respiratory viral infections in early childhood

4.      Exercise and Cold Air:

o    Exercise-induced bronchoconstriction

o    Cold, dry air can trigger symptoms

5.      Medications:

o    NSAIDs, beta-blockers can provoke attacks in susceptible individuals

Symptoms:

·         Wheezing

·         Shortness of breath

·         Chest tightness

·         Coughing, especially at night or early morning

Treatment Options:

1.      Quick-Relief Medications (Rescue):

o    Short-acting beta-agonists (SABA): e.g., salbutamol

o    Used for immediate symptom relief

2.      Long-Term Control Medications:

o    Inhaled corticosteroids (ICS): Reduce airway inflammation

o    Long-acting beta-agonists (LABA): Used with ICS for persistent asthma

o    Leukotriene modifiers (e.g., montelukast)

3.      Biologic Therapy:

o    Monoclonal antibodies (e.g., omalizumab) for severe allergic asthma

4.      Allergen Avoidance and Environmental Control:

o    Reduce exposure to known triggers

5.      Patient Education:

o    Proper inhaler technique

o    Asthma action plan

 

15. (b) Elaborate the Impact of Smoking on the Development of COPD

Introduction:
Chronic Obstructive Pulmonary Disease (COPD) is a progressive lung condition characterized by airflow limitation. Smoking is the most significant risk factor.

Impact of Smoking on COPD Development:

1.      Airway Inflammation:

o    Tobacco smoke irritates and inflames the bronchi

o    Increases production of mucus and inflammatory cells

2.      Ciliary Dysfunction:

o    Smoking damages the cilia lining the respiratory tract

o    Impairs clearance of mucus and pathogens

3.      Alveolar Damage:

o    Causes destruction of alveolar walls (emphysema)

o    Reduces surface area for gas exchange

4.      Oxidative Stress:

o    Cigarette smoke contains free radicals

o    Promotes tissue damage and inflammation

5.      Impaired Immune Defense:

o    Smokers are more prone to respiratory infections

o    Infections exacerbate COPD progression

6.      Accelerated Lung Function Decline:

o    Smokers experience faster decline in FEV1 (Forced Expiratory Volume)

7.      Dose-Dependent Effect:

o    Risk increases with number of cigarettes and duration of smoking

Long-Term Consequences:

·         Chronic cough and sputum production

·         Breathlessness and exercise intolerance

·         Frequent exacerbations

·         Increased hospitalization and mortality

 

16.(a) Analyze the relationship between stress and the development of lifestyle diseases.

Chronic stress significantly increases the risk of developing lifestyle diseases by disrupting the body's normal physiological functions. While short-term stress responses (the "fight-or-flight" response) are adaptive, prolonged exposure to stress hormones like cortisol and adrenaline can lead to a state of chronic low-grade inflammation and metabolic dysregulation, which are key drivers of these diseases.

• Cardiovascular Diseases (CVD): Chronic stress elevates cortisol and adrenaline levels, leading to increased heart rate and blood pressure. Over time, this constant strain can damage blood vessels, promoting the buildup of plaque in the arteries (atherosclerosis), which can lead to heart attacks and strokes. Additionally, stress hormones can increase blood cholesterol and triglycerides, further raising CVD risk.
• Diabetes: Cortisol's primary role is to increase the availability of glucose (sugar) in the bloodstream to fuel the body's response to a threat. When stress is chronic, this persistent elevation of blood sugar can lead to insulin resistance, where the body's cells no longer respond effectively to insulin. This forces the pancreas to produce more insulin, eventually leading to type 2 diabetes.
• Obesity: Stress is directly linked to weight gain, particularly in the abdominal area. High cortisol levels can increase appetite and promote cravings for high-calorie, high-sugar foods. This hormonal effect, combined with stress-induced behaviors like emotional eating and reduced physical activity, contributes to obesity and its associated health risks, such as metabolic syndrome.
• Indirect Effects: Beyond these direct physiological mechanisms, chronic stress often leads to unhealthy coping behaviors. People under constant stress may be more likely to smoke, drink alcohol, eat a poor diet, and get insufficient sleep, all of which are independent risk factors for a variety of lifestyle diseases.

 (b) Explain the role of genetics and lifestyle in the development of obesity in children and adolescents.

Suggest interventions for preventing and managing this condition.

            Childhood and adolescent obesity is a complex condition driven by a combination of genetic predispositions and lifestyle factors.

1. The Role of Genetics

Genetics can influence a child's susceptibility to obesity by affecting their metabolism, appetite, and how their body stores fat. While no single "obesity gene" is responsible, several genes can increase a child's likelihood of gaining weight. For example, some genetic variations can make a person more prone to overeating or can affect their body's ability to regulate hormones that control hunger and satiety. However, a genetic predisposition doesn't guarantee a child will become obese; it simply makes them more vulnerable to the effects of an obesogenic environment.

2. The Role of Lifestyle

Lifestyle factors are the most significant and modifiable contributors to childhood obesity. These include:

·         Dietary Habits: A diet high in processed foods, sugary drinks, and unhealthy fats, coupled with large portion sizes and frequent snacking, is a primary driver of excess calorie intake.

·         Physical Inactivity: A sedentary lifestyle, often characterized by excessive screen time (TV, video games, smartphones), replaces active play and exercise, leading to an energy imbalance where calories consumed exceed calories burned.

·         Family and Social Environment: A child's home environment and family behaviors play a crucial role. Children of obese parents are more likely to be obese themselves, not only due to genetics but also because of shared eating and activity habits.

Interventions for Prevention and Management

Preventing and managing childhood obesity requires a comprehensive, family-based approach that focuses on sustainable lifestyle changes rather than restrictive dieting.

1.      Promote Healthy Eating Habits:

o    Family Meals: Encourage regular family meals at the table to model healthy eating and discourage "mindless" eating in front of screens.

o    Nutrient-Rich Foods: Make fruits, vegetables, and whole grains readily available and appealing. Limit access to sugary drinks, fast food, and high-fat snacks.

o    Portion Control: Educate children and parents on appropriate portion sizes.

2.      Increase Physical Activity:

o    Active Play: Encourage at least 60 minutes of moderate to vigorous physical activity per day. This can be unstructured play like riding bikes, playing tag, or dancing.

o    Family Activities: Make physical activity a fun, family affair, such as hiking, swimming, or playing sports together.

o    Limit Screen Time: Set clear limits on recreational screen time (e.g., no more than two hours per day) to free up time for active pursuits.

3.      Encourage Positive Behavioral Changes:

o    Role Modeling: Parents should lead by example by adopting a healthy lifestyle themselves.

o    Positive Reinforcement: Focus on praising healthy behaviors and efforts, not on weight or body image. Never shame or criticize a child about their weight.

o    Adequate Sleep: Ensure children get enough sleep, as insufficient sleep is linked to an increased risk of obesity.

o    Professional Guidance: Consult a pediatrician, registered dietitian, or mental health professional to develop a personalized plan and address any underlying emotional or psychological issues.