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Why are the testosterone levels decreasing in men?

Low Testosterone Levels in Men

For years, there has been a noticeable decrease in testosterone levels among men. While it’s expected for testosterone to naturally decline with age, there has been a concerning trend of decreasing levels across generations since the 1970s. This means that on average, younger generations such as Gen Zers and Millennials have notably lower testosterone levels than previous generations. The question arises: what factors are contributing to this decline among the youth?

Understanding the generational decline in testosterone

Research indicates that the average testosterone levels in men have been steadily decreasing. For example, a study in Massachusetts found that the average testosterone level of a 60-year-old man in 1987 was around 17.5nmol/L, whereas a 60-year-old man in 2002 had a level closer to 15nmol/L. This suggests an annual decline of about 1% in testosterone levels among men.

Similar trends have been observed in other populations, such as in Finland, Denmark, and Israel, indicating that this decline is not limited to a specific region or population group. While it’s challenging to predict the exact testosterone levels of future generations, the current trajectory suggests that younger generations may indeed have lower testosterone levels as they age.

What is causing the low testosterone levels?

Several factors may be contributing to the decline in testosterone levels:

1. Obesity and Sedentary Lifestyles: 

Obesity rates are going up, and this might be one reason why testosterone levels are going down. Being overweight can mess up the body’s hormones and how it deals with insulin, which can lower testosterone. Some research shows that a higher BMI (how fat you are) can make your testosterone level look like someone older. 

These days, we tend to eat too much and not exercise enough, partly because we love technology so much. We can use our phones to order food and watch TV without ever leaving the house! This is different from how things used to be. Our jobs are also different. We use machines instead of doing hard work by hand, and many jobs don’t require us to move around much. This lack of activity can also lower testosterone. 

Even when you take obesity into account, studies still show that testosterone levels are going down. This means that there might be other reasons, too.

2. External Toxins: 

Did you know that the amount of plastic produced globally has increased from 50 million to 300 million tons since the 70s? Scientists have found a connection between this increase and changes to our hormone health. 

This is because many plastics contain chemicals that can interfere with our hormones, called endocrine-disrupting chemicals (EDCs). These chemicals can be natural or man-made and can be harmful over time, even in low doses.

EDCs are chemicals that you can find in everyday things like plastic bottles, food containers, and detergents. Studies have shown that these chemicals can affect your body in many ways. They may cause problems with attention, immunity, metabolism, puberty, and reproduction. Some of these chemicals can even lower the quality of semen and testosterone levels, which could be part of the reason why there are fewer people having babies these days.

3. Reduced Smoking Rates:

Did you know that some studies show that smoking may slightly increase testosterone levels? However, not all studies agree with this. Nicotine, which is found in cigarettes, is broken down by the body into cotinine, and it’s possible that this may prevent testosterone breakdown. 

Back in the 70s, half of men used to smoke, but now only around 15% of men in the UK smoke. This decrease in smoking may have contributed to falling testosterone levels. However, smoking is extremely harmful to the body and its dangers far outweigh any potential effect it may have on testosterone. Instead, there are safe and natural ways to boost testosterone levels. 

4. Mental Health and Stress:

When we experience stress, our testosterone levels may increase temporarily. 

However, if we experience long-term stress, both physical and psychological, our testosterone levels are likely to decrease. 

Some people believe that we are more stressed as a society than ever before, but this is up for debate. Although we face similar challenges to those of the past, our constant connectivity through technology can make it difficult to switch off and relax. 

Many children now own smartphones from a young age, which can lead to various difficulties, such as problems regulating emotions, addiction to social media, and reduced physical activity. 

However, some argue that digital communication can improve our relationships and provide us with new knowledge. The use of technology is still relatively new, and we are unsure of the long-term effects it may have on our lives.


There are many reasons why men’s testosterone levels might be decreasing. Some people think it’s because of things like wearing tight underwear or being in warm places too often.

Others believe that conditions like diabetes might play a role, but it’s not clear which one causes the other. 

Ultimately, it’s probably a combination of different things that are leading to this trend. Our lifestyles, environment, and behaviors are all changing, and that could be part of the reason why testosterone levels are declining.

Importance of Testosterone for Men

Testosterone is a hormone that creates and keeps male features such as body hair, muscle growth, and sperm production. If testosterone levels get too low, it can cause fatigue and lower sex drive. It’s important to keep testosterone levels at a good level for overall health and well-being. Some key points to remember are:

  • Testosterone is a hormone that’s important for male development and well-being.
  • It helps create and maintain features like muscle growth, body hair, and sperm production.
  • Low testosterone levels can cause symptoms like fatigue and reduced sex drive.
  • It’s important to maintain optimal testosterone levels for overall health and well-being.

Should You Be Concerned?

It has been observed that the levels of testosterone, which is a hormone that plays a vital role in men’s overall health and reproductive capabilities, have been decreasing over time. 

However, the current averages are still within the normal range, and not yet considered to be low enough to affect the overall population. 

Despite this, there are some concerns from an evolutionary and health perspective. As testosterone is an important hormone for men’s health and reproductive abilities, this decline raises questions about the future of men’s health and fertility. It is important to monitor this trend and take measures to ensure men’s health and well-being in the future.

Symptoms of Low Testosterone

Low testosterone levels can manifest in various symptoms, which can affect physical, mental, and sexual health. It is essential to recognize these symptoms early to seek appropriate treatment.

1. Physical Symptoms

Physical symptoms of low testosterone may include:

  • Reduced muscle mass and strength
  • Increased body fat, especially around the abdomen
  • Decreased bone density, leading to osteoporosis
  • Fatigue and decreased energy levels
  • Hair loss and thinning of the hair
  • Decreased facial and body hair growth
  • Gynecomastia (enlargement of breast tissue)

2. Mental Symptoms

Low testosterone levels can also affect mental health and cognitive function, leading to:

  • Mood swings and irritability
  • Depression and anxiety
  • Difficulty concentrating and memory problems

3. Sexual Symptoms

One of the most common symptoms of low testosterone is sexual dysfunction, which may include:

  • Decreased libido (sex drive)
  • Erectile dysfunction (difficulty achieving or maintaining an erection)
  • Reduced sperm count and infertility

Monitoring Testosterone Levels

You don’t need to check your testosterone levels often unless you have symptoms of low testosterone. It’s best to talk to a healthcare professional if you have any concerns. You can also use home testing kits if you want to check your testosterone levels at home.

To sum up, the decline in testosterone levels in men from one generation to the next is a complex issue that is affected by many different things. It’s important to understand these trends and what they mean so that we can help men stay healthy and happy in today’s world.


What causes a man’s testosterone levels to drop?

Testosterone levels can drop due to aging, certain medical conditions like hypogonadism, obesity, chronic illness, and some medications.

What are the causes of low testosterone?

Low testosterone can be caused by aging, obesity, certain medical conditions like diabetes, and lifestyle factors like stress and lack of exercise.

How can you prevent testosterone from decreasing?

To prevent testosterone from decreasing, maintain a healthy weight, exercise regularly, eat a balanced diet, manage stress, and get enough sleep.

What can a man do to address low testosterone?

A man with low testosterone can talk to a healthcare provider about treatment options, which may include hormone replacement therapy or other medications.

How can I increase my testosterone quickly?

To increase testosterone quickly, focus on healthy lifestyle habits like regular exercise, a balanced diet rich in protein and healthy fats, and managing stress.

At what age is testosterone highest?

Testosterone levels are typically highest in men during their late teens and early 20s, and then gradually decline with age.

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