A study report links rising blood sugar with sperm and erectile changes. Read the findings, their limits and the context from EAU guidance.
In a report dated 2026-10-08, Newsmax described findings presented at an Endocrine Society meeting by researchers led by Michael Zitzmann. The account linked modest increases in blood glucose below the study's diabetes threshold with declining sperm movement and erectile function. The men had been followed from 2014 through 2020.
The report raises a metabolic question alongside the hormone question: how should blood-sugar changes be considered when discussing sexual symptoms? Its findings also draw a distinction between erectile function and reported libido. Understanding those separate outcomes is central to interpreting the account.
According to Newsmax, the study began in 2014 with 200 healthy men aged 18 to 85. Researchers followed the group through 2020, when 117 participants remained. This was a follow-up of the same cohort over time rather than a one-time comparison of different men.
Researchers assessed semen and hormone profiles alongside erectile function. They also assessed metabolic markers including BMI and blood glucose. That range of measurements matters because the report concerns changes across several aspects of health, not just the result of one hormone test.
The account describes men whose blood sugar rose while their HbA1c remained below 6.5%, the diabetes threshold used in the report. It places the reported sexual-function changes within that below-threshold group.
Reading the study as a follow-up also changes the emphasis. The researchers were tracking how measurements changed over time, rather than presenting a single result as a complete description of a man's sexual health. This is why the reported pattern of rising glucose is important to the account.
The Newsmax account highlights three results. Together, they give the report its main emphasis: metabolic changes tracked with some sexual-health changes while testosterone showed a different relationship.
Hormone levels and semen profiles remained largely within normal ranges overall, according to the report. Yet sperm movement declined among men whose blood sugar increased. The movement of sperm is the feature referred to here as sperm motility.
Those statements describe different aspects of the findings. A profile described as largely within normal ranges can still include measurements that change during follow-up. The reported observation was about declining movement, not a claim that every semen measure became abnormal.
Newsmax also reported declining erectile function among men with rising blood sugar. Zitzmann interpreted the sexual-health changes as correlating more closely with modest glucose increases and other metabolic changes than with age or testosterone levels.
This is the lead researcher's interpretation as conveyed in the news account.
Testosterone showed a different pattern. The Newsmax account says it was not directly linked to erectile function in this study, although it appeared related to participants' reported libido.
The point for reading the results is to keep desire and erectile function separate. A headline that groups both under sexual health should not erase which outcome each measurement was linked to.
The findings are observational. Following measurements over time can reveal a pattern, but it does not establish that rising glucose caused the changes. It also does not show that lowering glucose would improve erections or sperm movement.
Several details limit how much weight the report should carry:
Two broader conclusions also need to be kept out of the reading. The testosterone finding is not evidence that the hormone has no role in erectile function. And the account's general advice about blood-sugar health is not evidence that lifestyle changes reverse the sexual changes observed in this cohort.
The European Association of Urology guidance already supports a broad evaluation of erectile dysfunction. Its scope includes glucose or HbA1c, lipids and testosterone testing as appropriate. Hormone levels are therefore one part of the assessment rather than its only dimension.
The study report fits that approach by drawing attention to a metabolic measure alongside sexual outcomes. Its contribution is an observation within a follow-up group, not a replacement for the guideline. For readers, the useful connection is that a discussion about erections can include broader health measurements without abandoning the hormone question.
There is no need to set glucose and testosterone against each other as competing explanations. The EAU assessment includes both. The report's distinction between libido and erectile function also helps clarify why different concerns deserve different questions.
Guidance and a conference presentation also serve different purposes. The guideline describes an assessment framework for clinical care. The reported presentation describes observations from a particular cohort. Placing the two side by side keeps the clinical framework in view while allowing an emerging observation to add a focused question.
That context changes how the update is read. Instead of treating a testosterone result as the entire story, the discussion can ask how the symptom and the wider assessment fit together. Sexential's explanation of separating desire from physical response offers related context for that distinction.
For someone experiencing persistent erection difficulties, the practical implication is a conversation with a clinician about a broad health assessment. Under EAU guidance, that discussion may include glucose or HbA1c alongside lipid and testosterone testing. Which tests are appropriate and how results should be interpreted remain personal clinical decisions.
The starting point is the concern itself, not a preferred explanation. A change in desire is a different question from a change in erectile response. Describing which has changed helps keep the conversation focused on the issue being assessed.
General questions prompted by the report include:
These are discussion prompts rather than a request for every test. The purpose is to make room for metabolic health and hormones in the same conversation. Sexential's resource on putting changes in sexual function into words provides a related educational starting point.
Newsmax also notes that healthy eating, regular physical activity and losing extra weight can help keep blood sugar in check. Those points concern general blood-sugar health. Personal choices about health management belong in a conversation that takes the individual's circumstances into account.
Readers whose main concern is desire may find context for interpreting hormone tests useful when preparing questions. The value of this update is not to make every sexual concern a glucose question. It is to give metabolic health an appropriate place in the discussion, alongside the specific experience the reader wants to understand.
Sexual health deserves clear questions and a conversation without blame.
Choosing how much weight to give a blood-sugar finding is an information decision, and Sexential brings sexual-health evidence into everyday context. For people from 35 to 65 who are unsure what influences sexual function, its explanations connect hormones with desire and relationships to support clearer questions while keeping education separate from individual medical advice.
Follow Sexential for thoughtful guidance on desire, sexual function, hormones, confidence, relationships and intimacy. Explore new articles and evidence-aware resources for sexual wellbeing across adulthood.
A report on a student survey links attention with men’s sexual satisfaction. Here’s the evidence, its limits and the practical context for midlife.
A new report puts men’s midlife testosterone changes in context, with guidance on assessment, partner conversations and fertility considerations.
The Menopause Society’s 2026 program places lifestyle, sleep and sexual health together. Here is what the agenda and partner research actually report.
Explore practical resources on desire, function, hormones, confidence, intimacy and sexual wellbeing.
Read the Blog
