Why do men after 30 years old often have reduced testosterone?

Medical evidence shows that after the age of 30, testosterone levels in men typically decline by about 1% per year. This decline can be accelerated by other factors such as weight gain, illness or an unhealthy lifestyle.

Testosterone levels in men typically peak between the ages of 20 and 30. After this stage, levels of the hormone begin to decline. The decline is slow but continuous, according to the UK health website Medical News Today .

Reduced testosterone will make men feel tired often

PHOTO: AI

After the age of 30 - 35, many men find their bodies more easily tired, their libido decreases, and their muscles gradually lose strength. The reasons are due to the following mechanisms:

Natural aging

One of the most basic factors that causes testosterone to decrease with age is the decline in function of the male reproductive organs, especially the testicles. The Leydig cells, which produce testosterone, in the testicles gradually lose quantity and quality over time.

For some people, as they enter middle age, their testosterone levels can drop to about 20-50% lower than when they were younger, depending on their physical condition and other conditions.

Hormonal changes

In addition to reduced Leydig cell function, there are also some endocrine changes that contribute to reduced testosterone. Specifically, in the body there are protein molecules called SHBG. They bind tightly to sex hormones such as testosterone, helping to transport this hormone in the blood. Testosterone when bound to SHBG will not be able to function, meaning it cannot enter the tissue and perform physiological functions.

As we age, SHBG levels typically increase. As a result, the amount of testosterone available to the body decreases significantly, even though total testosterone may not have decreased much.

This explains why many middle-aged men have normal total testosterone test results but show signs of low testosterone. These signs include fatigue, muscle loss, and decreased libido.

Lifestyle, disease

Testosterone decline with age is a natural process, but many other factors can accelerate it. These factors include obesity, belly fat, and being overweight. Many studies show that visceral fat not only causes inflammation, but also increases SHBG, reduces available testosterone, and impairs endocrine function.

Additionally, stress and lack of sleep increase the stress hormone cortisol, which in turn contributes to inhibiting the body's ability to secrete testosterone, according to Medical News Today .

Source: https://thanhnien.vn/vi-sao-nam-gioi-tu-sau-30-tuoi-thuong-bi-giam-testosterone-185251202182410805.htm