Weight Reduction – Methods, Causes and Tips

What Is Weight Reduction?

Weight reduction is the deliberate process of decreasing body weight, primarily by reducing excess body fat. It is medically recommended when a person is classified as overweight (BMI 25–29.9) or obese (BMI ≥ 30). The goal is to improve overall health, lower the risk of chronic diseases, and enhance quality of life.

Causes of Overweight

Excess body weight results from a prolonged imbalance between calorie intake and energy expenditure. Common contributing factors include:

• High-calorie, low-fiber diets
• Physical inactivity and sedentary lifestyle
• Genetic predisposition
• Hormonal disorders (e.g., hypothyroidism, Cushing syndrome)
• Psychological factors such as stress or emotional eating
• Certain medications (e.g., corticosteroids, antidepressants)
• Insufficient sleep and disrupted circadian rhythm

Health Significance

Sustained excess body weight significantly increases the risk of various conditions, including:

• Type 2 diabetes mellitus
• Cardiovascular diseases (e.g., hypertension, heart attack)
• Dyslipidemia (abnormal blood fat levels)
• Musculoskeletal disorders (e.g., osteoarthritis)
• Sleep apnea
• Certain types of cancer

Even a modest weight loss of 5–10% of initial body weight can substantially reduce these health risks.

Methods of Weight Reduction

Dietary Changes

A balanced, calorie-reduced diet forms the foundation of sustainable weight loss. Key recommendations include:

• Increasing intake of vegetables, legumes, and whole grains
• Reducing sugar, saturated fats, and highly processed foods
• Adequate protein intake to preserve muscle mass
• Regular meals to help regulate hunger and appetite

Physical Activity

Regular exercise increases energy expenditure and supports fat loss. The WHO recommends at least 150–300 minutes of moderate aerobic activity per week (e.g., brisk walking, cycling, swimming) along with muscle-strengthening activities on at least two days per week for adults.

Behavioral and Psychological Support

Behavioral therapy and psychological counseling help individuals change unhealthy eating and activity patterns in the long term. Techniques such as self-monitoring, stress management, and motivational interviewing play an important role in successful weight management.

Pharmacological Treatment

In certain cases, medication may be a useful addition to lifestyle changes. Approved weight-loss medications (e.g., GLP-1 receptor agonists such as semaglutide) are typically prescribed only for obesity or overweight with comorbidities, and must be used under medical supervision.

Surgical Interventions

For severe obesity (BMI ≥ 40, or BMI ≥ 35 with serious comorbidities), bariatric surgery (e.g., gastric bypass, sleeve gastrectomy) may be considered when other treatments have been unsuccessful.

Recommendations and Goals

A realistic and health-promoting rate of weight loss is approximately 0.5–1 kg per week. Rapid weight loss through very low-calorie diets can lead to muscle loss, nutritional deficiencies, and the so-called yo-yo effect (weight regain). Sustainable lifestyle changes are more effective in the long term than short-term diets.

When to Seek Medical Advice

Medical consultation is recommended in the following situations:

• Obesity or overweight accompanied by related health conditions
• Inability to lose weight despite consistent lifestyle changes
• Unexplained, unintentional weight loss
• Eating disorders or psychological distress related to body weight

References

1. World Health Organization (WHO): Obesity and overweight. Fact sheet. Geneva, 2024. Available at: https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight
2. Deutsche Adipositas-Gesellschaft (DAG): S3 Guideline Obesity – Prevention and Treatment. AWMF Register No. 050-001, updated edition.
3. Wadden TA, Tronieri JS, Butryn ML: Lifestyle modification approaches for the treatment of obesity in adults. American Psychologist, 2020; 75(2): 235–251.