An Integrated Model Showing That the Onset of ED (Erectile Dysfunction) is Fundamentally Caused by 'Metabolic Abnormalities and Autonomic Imbalance' Due to Overeating and Lack of Exercise, Rather Than a 'Decline in Testosterone'

Regarding the struggle with ED (erectile dysfunction) faced as we age, many people tend to easily conclude that “it’s because male hormones (testosterone) have decreased.” However, the facts uncovered by the latest large-scale epidemiological surveys and endocrine models are completely different. The true mastermind behind ED is a complex (integrated model) of extremely physical and systemic system errors: “metabolic abnormalities, damage to the vascular endothelium, and runaway autonomic nervous system,” triggered by overeating, lack of exercise, and notably, “insufficient chewing (eating fast).”

This content is based on the findings of large-scale cohort studies tracking the factors of ED onset in middle-aged and older men, as well as systematic reviews showing the relationship between muscle strength and ED.

Erectile dysfunction and its related factors in middle-aged and older men: A cohort study | Annals of Internal Medicine

ED is an Early Alert Signaled by the “Screams of Blood Vessels (Endothelial Dysfunction)”

If we break down the phenomenon of erection anatomically and physiologically, it is a “hydrodynamic process where the tension of the sympathetic nervous system is released (parasympathetic nervous system becomes dominant), nitric oxide (NO) is released, the fine arteries of the penis dilate to their limits, and a massive amount of blood flows in.”

In other words, if the blood vessels are stiff (arteriosclerosis) or clogged, the foundational system physically cannot operate. In large-scale cohort studies (such as reports in Annals), it has been proven that the new onset of ED is perfectly linked to the following factors.

• Hypertension, Hyperglycemia, Dyslipidemia: These three major components of metabolic syndrome directly damage the inside of blood vessels (vascular endothelial cells), uprooting the production capacity of “nitric oxide (NO),” the master key for dilating blood vessels.
• The Role as a Canary in a Coal Mine: Because the arteries of the penis are much “thinner (about 1-2 mm in diameter)” compared to the coronary arteries of the heart or the arteries of the brain, they are the first and most strongly affected by systemic arteriosclerosis. In other words, the onset of organic ED is clinically defined not merely as a lower body issue, but as a fatal alert (early siren) from the blood vessels warning that “a myocardial infarction or stroke may occur a few years later.”

The Nightmare of Insulin Resistance Caused by “Loss of Muscle Mass (Sarcopenia)”

Furthermore, recent systematic reviews (e.g., analyses of the PubMed database) have revealed that men whose skeletal muscle mass in the lower body or physical muscle strength level has decreased (tending towards sarcopenia) are significantly more likely to develop severe ED.

The “metabolic model” is deeply involved here as well. Muscles are giant incinerators that consume the largest amount of “sugar (glucose)” in the human body. When muscle mass decreases due to a lack of exercise, the sugar absorbed from meals cannot be fully processed and overflows into the blood, resulting in a worsening of systemic “insulin resistance (a state where insulin is less effective).” The worsening of insulin resistance is directly linked to the aforementioned “severe damage to the vascular endothelium,” establishing a causal pathway where the decline in muscle strength leads to the aggravation of ED like falling dominoes.

An Integrated Approach Brought by “Chewing” and Improvement in “Lifestyle”

When treating ED as an integrated model of metabolism, blood vessels, and the autonomic nervous system in this way, symptomatic treatment relying solely on phosphodiesterase 5 (PDE5) inhibitors such as “Viagra” cannot stop the fundamental aging of blood vessels (progression of arteriosclerosis).

As a powerful non-pharmacological intervention (lifestyle hack) to break this vicious cycle, the intervention through “chewing,” which appears repeatedly in this series, occupies an extremely rational position.

• By chewing meals thoroughly, incretins (GLP-1) are secreted, improving insulin resistance and preventing vascular damage (glycation and oxidative stress) before it happens (metabolic approach).
• By continuously chewing at a constant rhythm, it physically lowers the “tone of the sympathetic nervous system,” which is running wild due to chronic stress, and allows the parasympathetic nervous system, the switch for an erection, to become dominant (autonomic nervous system approach).

Rather than brushing off ED with vague terms like “aging phenomenon” or “decrease in hormones,” recognizing it as the final output (bug) of internal organ troubles created by daily “fast eating, swallowing whole, overeating, and lack of exercise,” and attempting to reconstruct the system starting with increasing the number of chews during meals, can be said to be the most correct medical approach.