Obesity is a chronic and complex disease characterised by excessive fat accumulation in the body. Recognised as a global epidemic by the World Health Organization, obesity is a leading cause of serious health problems such as cardiovascular disease, diabetes, hypertension and certain cancers. Its underlying causes are usually multifactorial and intertwined.
1. Genetic Factors and Family History
Research indicates that genetic predisposition may account for 40-70% of obesity development. Individuals with a family history of obesity are at higher risk than those without.
- Heredity: Specific genes, such as FTO (Fat Mass and Obesity-Associated), can affect appetite regulation, energy expenditure and fat storage.
- Metabolic Rate: Some individuals are genetically predisposed to a slower basal metabolic rate, burning fewer calories at rest.
- Fat Distribution: Genetics influence whether fat accumulates in the abdomen (apple shape) or the hips and thighs (pear shape). Abdominal fat is metabolically more risky.
Important Note: Genetic predisposition is not an inevitable fate; the risk can be largely managed through lifestyle changes.
2. Dietary Habits and Diet Quality
- High Energy Density: Fast food, processed foods, sugary drinks and snacks are high in calories but low in nutritional value. They do not adequately stimulate satiety, leading to overconsumption.
- Portion Sizes: Restaurant and takeaway portions have grown considerably, leading to unconscious higher calorie intake.
- Irregular Meal Patterns: Prolonged fasting followed by large meals causes blood sugar fluctuations and increases fat storage.
- Liquid Calories: Fruit juices, sodas and sweetened coffees contribute large amounts of unnoticed sugar.
3. Lack of Physical Activity and Sedentary Lifestyle
The energy balance is simple: calories in exceeding calories out results in weight gain.
- Desk Jobs: Sitting 8-10 hours a day reduces muscle mass and slows metabolism.
- Passive Transportation: Widespread car use has reduced walking and cycling.
- Digital Entertainment: Screen time replaces physical activity, and snacking tends to increase during it.
4. Psychological and Emotional Factors
- Emotional Eating: Stress, sadness, anxiety, boredom or loneliness can drive people towards high-carbohydrate, high-fat "comfort" foods.
- Depression and Anxiety: These conditions can disrupt weight balance through appetite changes and reduced motivation for activity.
- Low Self-Esteem: Can create a vicious cycle that reinforces emotional eating.
5. Hormonal Imbalances and Metabolic Diseases
- Hypothyroidism: An underactive thyroid lowers metabolic rate, causing weight gain, fatigue and weakness.
- Insulin Resistance and PCOS: Cells become insensitive to insulin; the pancreas produces more, and high insulin levels increase fat storage, particularly abdominal fat.
- Cushing's Syndrome: Excess cortisol causes fat to accumulate in the trunk.
- Certain Medications: Antidepressants, corticosteroids, and some diabetes and antipsychotic medications can cause weight gain.
6. Sleep Disorders and Poor Sleep Quality
- Effect on Hormones: Inadequate sleep raises appetite-stimulating ghrelin while lowering satiety-signalling leptin.
- Energy Balance: Sleep loss increases daytime fatigue, reducing activity and increasing cravings for high-calorie foods.
- Stress: Poor sleep raises cortisol, which can trigger abdominal fat accumulation.
7. Environmental and Socioeconomic Factors
These factors, beyond individual control, create an "obesogenic environment."
- Food Environment: Living where healthy food access is limited and fast food is abundant.
- Economic Constraints: Fresh produce and lean protein being relatively expensive while processed foods are cheap.
- Work and Family Life: Long working hours may leave little time or energy for meal preparation.
- Social Norms: Large portions being central to social events.
Conclusion and Recommendations
Obesity is a serious disease arising from the complex interaction of genetic, physiological, psychological and environmental components — beyond personal choice. The "eat less, move more" approach alone may be insufficient.
- Seek Professional Help: Treatment should involve a multidisciplinary team of a general surgeon or endocrinologist, a dietitian and a psychologist.
- Investigate Underlying Causes: Check whether a hormonal disorder (thyroid, insulin resistance) underlies the weight gain.
- Individualised Treatment: A personalised plan should account for genetics, lifestyle, comorbidities and psychological state.
- Surgical Options: For individuals with a BMI over 40, or 35-40 with comorbidities such as diabetes or hypertension, when diet and exercise have not succeeded, bariatric surgery may be considered. Sleeve gastrectomy and gastric bypass achieve weight loss through both mechanical restriction and hormonal change. Eligibility is decided after a detailed assessment.
This article is for informational purposes only. For diagnosis and treatment, please consult your physician.