Feature Post
Back to Blog Page

Slow metabolism causes

Scroll For More Info

Originally published February 22, 2022. Last updated March 25, 2026.

Slow metabolism causes

If you are experiencing unexplained weight gain or persistent fatigue, a slow metabolism might be the reason. The good news is that once you identify the cause, you can take specific steps to reignite your metabolic fire.

Contact Us for a Weight Loss Consultation

The science of metabolism

Metabolism is the chemical process your body uses to convert the food and drink you consume into energy. The number of calories your body uses at rest for basic functions like breathing and cell repair is known as your basal metabolic rate (BMR). Metabolic processes differ based on metabolic rate factors such as body size, gender and muscle mass. For example, muscle tissue burns more calories at rest than fat tissue does.

You can diagnose a slow metabolism through:

  • Comprehensive hormone and metabolic marker blood panels.
  • Indirect calorimetry.
  • Body composition analysis.

Slow metabolism myths and misconceptions

Below is the truth behind common myths and misconceptions:

  • Metabolism is 100% genetic: Genetics can determine your baseline metabolism, but your lifestyle, muscle mass and hormonal health also affect your metabolic rate.
  • Spicy food and green tea fix a slow metabolism: Although certain foods may temporarily increase metabolic rate post-meal, they cannot boost metabolism in the long term.
  • Weight gain is inevitable with age: While weight gain becomes easier, it’s not inevitable. Preserving muscle mass through strength training can counteract age-related metabolic slowing.

Causes of a slow metabolism

Slow metabolism causes are often associated with:

Hormonal metabolism issues

Your hormones act as the body’s internal control system, sending chemical messages that dictate how efficiently your metabolism converts food into fuel. When this delicate network is disrupted, whether by menopause, hypothyroidism, stress or polycystic ovary syndrome (PCOS), your metabolism slows down.

Hormonal issues that cause slow metabolism include leptin resistance, high ghrelin, low testosterone, elevated androgens in women and fluctuating or dominating estrogen. Other causes are:

  • Low thyroid T3 and T4 hormones: The underactive thyroid condition called hypothyroidism significantly slows calorie burning. Signs include cold feet, fatigue, dry skin and thinning hair.
  • High cortisol: Chronic stress raises cortisol levels, which can signal the body to store fat and slow down calorie burn. Besides slow metabolism symptoms, you may experience belly fat, anxiety and a rounded face.
  • Insulin resistance: When cells become resistant to insulin, the body remains in a fat-storage mode rather than a fat-burning one. Look out for intense sugar cravings, fatigue after meals and brain fog.

The aging process

As you age, your metabolic rate often dips due to sarcopenia, the gradual loss of muscle mass. Since muscle is metabolically active, having less of it means your BMR drops, and you burn fewer calories throughout the day.

Signs your metabolism has slowed down because of aging include:

  • Gradual weight gain despite no change in diet.
  • Loss of strength.
  • Decreased stamina.

Lifestyle factors

Daily habits influence metabolic speed. Sedentary behavior, sleep deprivation, medications and chronic dieting could downregulate energy expenditure. If lifestyle is the cause, you may notice signs like stiffness, low energy, afternoon fatigue and rapid weight regain despite no change in your diet.

How to boost your metabolism

Once the diagnosis is confirmed, the goal is to boost metabolism through targeted intervention. Different approaches include:

  • Exercise physiology: Treatment plans should prioritize resistance training over excessive cardio. Building muscle mass is a method for increasing metabolism.
  • Nutritional strategies: Focus on macronutrient balance. Increasing protein intake is essential to trigger the thermic effect of food (TEF) and support muscle protein synthesis. Other strategies include avoiding late-night snacks and portioning meals.
  • Bioidentical hormone replacement therapy (BHRT): This intervention optimizes estrogen, testosterone or progesterone levels to improve bodily functions.
  • Lifestyle optimization: Get enough sleep to regulate hunger hormones, practice stress reduction techniques and stay hydrated to support cellular function.

Take control of your metabolic health with Synergy Wellness

Navigating metabolic health can be complex, and general advice is rarely sufficient. At Synergy Wellness, we assist you with weight and energy concerns through comprehensive weight loss programs, medical aesthetic services and BHRT to manage the underlying causes. From a spa-like environment to personalized services that treat each client with respect and dignity, we’re committed to helping you take control of your health and happiness.

When you’re ready, call 661-878-9100 or reach out to us online to speak to a wellness expert.

Take control of your metabolic health with Synergy Wellness

Picture of Dr. Jan Trobisch

About the Author:

President, Medical Director: Jan Trobisch, MD

Dr. Jan Trobisch is a physician with formal training in Internal Medicine. He graduated from Freie Universität Berlin in 1999 and completed his internal medicine residency at Kern Medical Center in Bakersfield, California, in 2004. After residency, he provided inpatient medical care as a hospitalist and served as an attending physician involved in resident education and clinical supervision. In 2009, he established Synergy Wellness Center to deliver individualized care with an emphasis on evidence-informed decision-making and sustainable health outcomes.

Read MoreLess
Learn More About The Author

Message Us Now!

Text or call us at 661-336-2555, or ask a question below.

    [tel* phonenumber id="msg-phonenumber" placeholder "Enter your CELL phone number"]

    **You will receive a text message from us that you can reply to on your phone. Texting, emailing and Facebook may not be 100% secure based on your carrier, phone type and email service you use. By submitting this form you consent to these types of communication.


    This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.