Weight Gain
Overview
Weight gain is a phenomenon that occurs when the body's energy balance is disrupted, resulting in calorie intake exceeding calorie expenditure. It can be caused by various factors such as an increase in adipose tissue, muscle mass gain, or fluid retention, and affects health both in the short and long term. Weight gain can be intentional (e.g., muscle gain in athletes) or unintentional (e.g., due to metabolic diseases or medication side effects), and in modern society, it is recognized as a major risk factor for chronic diseases related to obesity.
Main Content
Physiological Mechanisms of Weight Gain
Weight gain fundamentally arises from an imbalance in energy homeostasis. The human body expends energy through basal metabolic rate, physical activity, and the thermic effect of food. When calorie intake consistently exceeds expenditure, the excess energy is primarily stored as triglycerides in fat cells (adipocytes). Hormones (insulin, leptin, ghrelin, etc.) and the nervous system (hypothalamus) regulate this process, with genetic factors, gut microbiota, sleep patterns, and stress playing complex roles.
Causes of Weight Gain
1. Dietary Factors: Excessive intake of high-calorie, high-fat, high-sugar foods, reliance on processed foods, irregular eating patterns, late-night snacking habits.
2. Physical Inactivity: Sedentary lifestyle, lack of exercise, reduced activity at work.
3. Genetic Factors: FTO gene variants, family history, differences in metabolic rate.
4. Hormonal and Metabolic Diseases: Hypothyroidism, Cushing's syndrome, polycystic ovary syndrome (PCOS), insulin resistance.
5. Medication Side Effects: Antidepressants, steroids, antipsychotics, beta-blockers, etc.
6. Psychological Factors: Emotional eating due to stress, depression, anxiety.
7. Sleep Deprivation: Reduced sleep duration lowers leptin (appetite-suppressing hormone) and increases ghrelin (appetite-stimulating hormone).
8. Aging: Decreased muscle mass and lower basal metabolic rate.
Health Effects
- Cardiovascular System: Increased risk of hypertension, dyslipidemia, coronary artery disease, heart failure.
- Metabolic System: Type 2 diabetes, insulin resistance, metabolic syndrome.
- Musculoskeletal System: Arthritis (especially knees, hips), back pain, gout.
- Respiratory System: Sleep apnea, worsening of asthma.
- Digestive System: Fatty liver, gallstones, gastroesophageal reflux disease.
- Mental Health: Depression, anxiety, low self-esteem, social stigma.
- Cancer: Increased risk of certain cancers such as breast, colorectal, and pancreatic cancer.
Diagnosis and Assessment
Evaluation of weight gain includes medical history, physical examination, body mass index (BMI) measurement, and waist circumference measurement. If necessary, thyroid function tests, blood glucose, insulin, cortisol, and sex hormone tests may be performed. A BMI of 25 or higher is classified as overweight, and 30 or higher as obese, though exceptions exist for individuals with high muscle mass.
Management and Treatment
1. Lifestyle Modification: Balanced diet (low-calorie, high-protein, high-fiber), regular exercise (aerobic + resistance training), adequate sleep (7-9 hours), stress management.
2. Behavioral Therapy: Food diaries, cognitive behavioral therapy, goal setting.
3. Pharmacotherapy: Appetite suppressants (phentermine, bupropion-naltrexone), fat absorption inhibitors (orlistat), GLP-1 receptor agonists (semaglutide, liraglutide), etc.
4. Surgical Treatment: Bariatric surgery such as gastric bypass, gastric banding, sleeve gastrectomy is considered for BMI 35 or higher or with comorbidities.
5. Treatment of Underlying Diseases: Thyroid hormone replacement, steroid dose adjustment, PCOS management.
Latest Trends
As of 2024-2025, the use of GLP-1 receptor agonists (e.g., Ozempic, Wegovy) has surged in the field of weight gain and obesity management, ushering in an 'era of weight loss drugs.' These drugs induce weight loss by suppressing appetite and increasing satiety, and have also demonstrated cardiovascular disease prevention benefits. Additionally, digital health technologies (wearable devices, mobile apps, AI-based diet analysis) are being actively utilized in weight management. Research on the link between gut microbiota and weight regulation is actively ongoing, with personalized nutrition and gene-based approaches gaining attention. Socially, the 'body positive' movement and awareness campaigns to reduce obesity stigma are spreading. In South Korea, the National Health Insurance Service expanded obesity management programs in 2024, and discussions are underway to broaden health insurance coverage for obesity treatments.
Related Topics
- [[Obesity]]
- [[Energy metabolism]]
- [[Diet therapy]]
- [[Exercise physiology]]
- [[GLP-1 receptor agonist]]
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