Fettzunahme verstehen: Mechanismen, beeinflussende Faktoren und Management

Adipose tissue stores energy as triglycerides. Fat gain occurs when energy intake consistently exceeds expenditure, creating a caloric surplus.

Key Drivers

1. Caloric Surplus: Excess calories from any source stored as fat. Ultra‑processed foods, sugary drinks, large portions promote overconsumption.
2. Physical Inactivity: Low NEAT (non‑exercise activity thermogenesis) and sedentary behavior reduce total energy expenditure.
3. Hormonal Regulation: Insulin promotes lipogenesis and inhibits lipolysis. Chronic hyperinsulinemia (from high glycemic load) favors fat storage. Cortisol (chronic stress) increases visceral adiposity.
4. Genetics & Epigenetics: Heritability of BMI ~40–70%. Variants in FTO, MC4R, etc., affect appetite, satiety, metabolic rate.
5. Medical Conditions: Hypothyroidism, Cushing’s, PCOS, insulin resistance, hypothalamic injury.
6. Medications: Glucocorticoids, antipsychotics, antidepressants, insulin, sulfonylureas, beta‑blockers.
7. Sleep Deprivation: Disrupts leptin/ghrelin, increases hunger, reduces insulin sensitivity.
8. Aging: Sarcopenia lowers basal metabolic rate; menopause shifts fat distribution viscerally.

Prevention & Management

• Modest caloric deficit (300–500 kcal/day) via diet + exercise.
• High protein, fiber‑rich whole foods for satiety and muscle preservation.
• Resistance training + aerobic activity (≥150 min/week moderate).
• Stress management, 7–9 hr sleep, limit alcohol.
• Treat underlying endocrine disorders; review obesogenic medications.

Sustainable lifestyle changes outperform restrictive diets long‑term.