There is rarely a single reason why this number climbs. Usually, it is a combination of several lifestyle and biological factors that influence how your body uses energy.
1. Low Muscle Mass
Muscle tissue is much more metabolically active than fat tissue. This means that muscle burns more calories even when you are sitting still or sleeping. If you have a low percentage of lean muscle, your body requires less energy to maintain itself. This lowers your BMR and raises your metabolic age.
Many people find that as they get older, they naturally lose muscle mass. This process is called sarcopenia. Without intentional strength training and adequate protein intake, this loss of muscle can cause the metabolic age to creep up year after year. Even if your weight stays the same, changing your body composition from muscle to fat will negatively impact your metabolic score.
2. High Body Fat Percentage
While muscle raises your BMR, excess body fat—particularly visceral fat—can have the opposite effect. Visceral fat is the fat stored deep within the abdominal cavity, surrounding your internal organs. It is more than just stored energy; it is biologically active tissue that can influence hormones and inflammatory pathways.
High levels of body fat can lead to a sluggish metabolism. This creates a cycle where the body becomes less efficient at processing energy, leading to further fat storage. When a scale calculates your metabolic age, it heavily weights the ratio of fat to lean mass. A high fat percentage is one of the most common reasons for a metabolic age that exceeds your actual years.
3. Poor Dietary Habits and Blood Sugar
What you eat directly affects how your cells produce energy. A diet high in processed sugars and refined carbohydrates can lead to frequent blood sugar spikes. Over time, this can impact insulin sensitivity. When your cells become less responsive to insulin, they struggle to take in glucose for energy.
This inefficiency at the cellular level can slow down your overall metabolism. Furthermore, a lack of essential micronutrients can hinder the chemical reactions required for energy production. If your body does not have the "tools" it needs to burn fuel, your BMR will remain low. Our Metabolic Health formula is designed to support healthy blood sugar levels and metabolic function, which may help improve how your body handles energy.
4. Chronic Stress and Cortisol
Stress is often overlooked as a metabolic factor. When you are chronically stressed, your body produces high levels of cortisol. Cortisol is a hormone designed for "fight or flight" situations. In the short term, it provides energy, but in the long term, it can be destructive to your metabolism.
High cortisol levels are associated with increased visceral fat storage and muscle breakdown. It can also interfere with your thyroid hormones, which act as the "thermostat" for your metabolism. If your thyroid slows down due to stress, your BMR will drop significantly, causing your metabolic age to soar.
5. Sleep Debt and Recovery
Sleep is the time when your body repairs tissue and balances hormones. Lack of sleep disrupts the hormones that control hunger and satiety, such as ghrelin and leptin. It also negatively impacts glucose metabolism. Even a few nights of poor sleep can make your body less efficient at processing energy.
If you are consistently sleeping less than seven hours a night, your body stays in a state of metabolic stress. This prevents you from building muscle and encourages the storage of fat. Many people find that improving their sleep hygiene is the fastest way to see a positive change in their metabolic data. If sleep and recovery are part of your routine goals, the Sleep & Stress collection offers a focused place to explore wellness support.
Key Takeaway: Metabolic age is primarily a reflection of your body composition and cellular efficiency. Increasing muscle mass and managing stress are two of the most effective ways to lower this number.
