What are the signs of slow metabolism?
Short answer: Common signs of a slower-than-expected metabolism include unexplained weight gain or difficulty losing weight, persistent fatigue, feeling cold more often, dry skin and hair thinning, constipation, and slowed thinking or low mood. These symptoms often reflect a lower basal metabolic rate or hormonal causes such as hypothyroidism, but causes vary.
Explanation
Metabolism encompasses the chemical processes that convert food into energy and maintain body functions; basal metabolic rate (BMR) is the energy used at rest. A “slow metabolism” means lower energy expenditure and often shows as systemic slowing: reduced heat production (feeling cold), slower gastrointestinal transit (constipation), decreased cardiac output and exercise tolerance (fatigue, low endurance), and changes in skin and hair turnover. Hormonal factors (notably low thyroid hormone), reduced muscle mass, aging, some medications, and prolonged calorie restriction can lower BMR. Objective assessment includes measurements such as resting metabolic rate, basal body temperature trends, and blood tests (e.g., TSH, free T4) interpreted by a clinician.
Tips
- Get basic blood tests (TSH, free T4) if multiple symptoms suggest hypothyroidism.
- Increase lean muscle through resistance training to raise resting energy expenditure.
- Ensure adequate protein intake and avoid chronic very-low-calorie diets.
- Prioritize sleep and reduce chronic stress, which can dysregulate metabolism.
- Review medications with a clinician that may lower metabolic rate (e.g., some antidepressants, beta-blockers).
- Stay hydrated and maintain regular physical activity for overall metabolic health.
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