Testosterone and Metabolic Health: Why Men Struggle with Weight, Energy, and Blood Sugar

What Most Men Are Missing

By: Integrative Medicine Physician, Dr. Katie Takayasu

At Wellness Insights Integrative Medicine, we frequently see men experiencing a gradual shift in how they feel and function. Energy levels decline, body composition changes, focus becomes less consistent, and sleep is no longer as restorative.

Many assume these changes are a normal part of aging.

In reality, they are often driven by underlying cardiometabolic dysfunction, with the hormone testosterone serving as one of the clearest indicators.

John: A Patient Story

John is 44 years old year and came to us with complaints of fatigue and weight gain since becoming a dad. A previously active college athlete, he had gained weight while working long hours in a successful business in the context of being involved with his young children. 

We did initial labs with John which showed he was struggling with insulin resistance, high blood sugar, and high triglycerides with low HDL, in addition to Hashimoto’s hypothyroidism and low testosterone. He was burning the candle at both ends, often short-changing his sleep in favor of work. Early mornings and late nights meant he almost never exercised, getting as few as 3,000 steps per day. 

He agreed to address his inactivity first, and he hired a trainer 2-3x per week to build muscle and strength. We also started him on a modest dose of testosterone. Almost immediately, the combination of strength training, daily walks for 30 minutes (often with friends and colleagues!), and testosterone therapy started to help him feel better. 

Interestingly, his scale weight actually increased. This was because his strength workouts were causing him to put on skeletal muscle mass (SMM), but he wasn’t losing fat. He was dismayed at this, but recognized that he felt stronger and more energetic than before. 

Once he was settled in his workout routine, he began to focus on his diet. He opted to use a GLP-1 medication to help curb his appetite and make more strategic nutrition decisions. He focused on lean protein and fiber at every meal, and slowly over the course of 20 months has lost more than 30 pounds of fat, and decreased his percentage body fat (PBF) from a high >30% to a stellar 16%! As you can imagine, he is overjoyed with his success. 

As he became more metabolically healthy, John’s need for testosterone decreased dramatically. This is due to the bi-directional relationship between testosterone and cardiometabolic health. As men work to decrease their cholesterol, blood sugar, and inflammation, we are often able to decrease or even eliminate their testosterone dose. 

Testosterone Plays a Larger Role Than Most Men Realize 

Testosterone is often associated with muscle mass or libido, but its role extends far beyond those areas. It is deeply connected to metabolic health and influences how the body produces energy, stores fat, and responds to stress.

Testosterone supports insulin sensitivity, helps regulate fat distribution, contributes to muscle maintenance, and plays a role in inflammation and recovery. When levels begin to decline, the impact is rarely isolated to one system.

Testosterone also helps with energy and positive mood. Most of our patients who use testosterone therapy report they just feel more like themselves. 

Understanding the Testosterone-Cardiometabolic Connection

Declining testosterone is closely linked to changes in cardiometabolic health. Lower levels are often associated with increased abdominal fat, reduced insulin sensitivity, elevated triglycerides, and decreased HDL cholesterol.

These changes do not occur independently. They reinforce one another.

As insulin resistance increases, testosterone levels tend to decline. As testosterone declines, body composition shifts toward increased fat storage and reduced muscle mass. Over time, this creates a cycle that becomes more difficult to reverse without a structured approach.

This is exactly where a comprehensive cardiometabolic evaluation becomes essential.

Rather than looking at testosterone in isolation, we evaluate and address the full system driving these changes. By combining advanced lab analysis, body composition data, and real-time glucose insights, we are able to identify the patterns contributing to both metabolic dysfunction and hormonal shifts.

From there, we build a personalized plan that targets the root causes of these changes, supporting blood sugar regulation, improving body composition, increasing muscle mass, reducing inflammation, and creating the conditions where testosterone can stabilize and improve naturally.

This is how we move from reacting to symptoms to addressing the system that is driving them.

Why This Pattern Often Goes Unaddressed

Many men are told their lab results fall within a normal range. However, normal does not always mean optimal.

Testosterone is often evaluated without context. It is rarely considered alongside body composition, blood sugar regulation, sleep quality, nutrition, stress levels, and overall metabolic health.

Without this broader perspective, the underlying pattern remains unrecognized and untreated.

A Structured Approach to Improvement

At Wellness Insights Integrative Medicine, we evaluate testosterone within the context of overall cardiometabolic health.

We assess advanced biomarkers, body composition, thyroid function, hormone levels, and real-time glucose patterns to better understand how metabolism and hormone function influence one another. We then build structured strategies around nutrition, movement, sleep, stress management, and recovery.

This approach allows us to move beyond isolated lab values and focus on improving how the body functions as a whole.

What to Pay Attention To

If you are experiencing increased abdominal fat, lower energy, reduced focus, poor recovery, or disrupted sleep, these are not random changes.

They are signals that the underlying system may need support.

Testosterone is often part of that story, but it is rarely the only factor.

The Takeaway

Testosterone is not simply a number to monitor. It is a reflection of the intersection of hormone and cardiometabolic health. And it’s bi-directional relationship with metabolism is important to address, especially in midlife. 

When the underlying systems are supported, testosterone often improves alongside them.

The goal is not to chase a single lab value, but to restore balance across the body. This is where meaningful and sustainable change occurs.

This blog and website do not provide medical advice. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Always check with your own healthcare provider before taking a new supplement and before making any significant diet, lifestyle, exercise or other changes. Never ignore professional medical advice in seeking treatment because of something you have read on this site. If you think you may have a medical emergency, immediately call your doctor or dial 911.