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الوسم: hormones

  • Cannabis Doesn’t Affect Men’s Testosterone or Fertility

    Cannabis Doesn’t Affect Men’s Testosterone or Fertility

    For years, scientists have debated how cannabis impacts male reproductive health. With increasing cannabis use around the world, questions about its long-term effects on hormones and fertility have gained urgency. Some research suggests that cannabis might negatively affect sperm quality and lower testosterone levels, while other studies find little evidence supporting these claims. Due to these conflicting results, researchers have been searching for clearer insights.

    A recent study from the University of Geneva (UNIGE) in Switzerland offers a surprising new perspective. The research indicates that, in young men, cannabis use does not decrease testosterone levels—in fact, it might even boost testosterone production in the testes. The findings were published in the journal Communications Medicine.

    The study was conducted by scientists from the University of Geneva in partnership with the Swiss Center for Applied Human Toxicology. Their objective was to better understand how cannabis influences the body’s hormonal systems, especially those involved in male reproduction.

    Male fertility is affected by many factors, including hormone levels, sperm production, lifestyle choices, age, and overall health. Testosterone, one of the key male sex hormones, plays a central role in sexual development, muscle growth, bone density, and reproductive function. Because of its importance, researchers have long wondered whether cannabis use can alter testosterone levels.

    Previous research has yielded mixed results. Some studies found that cannabis users had lower sperm counts, reduced motility, and poorer overall sperm quality. Others saw little to no direct effect of cannabis on reproductive hormones. One challenge in these studies was that many focused only on individual hormones, providing an incomplete picture.

    In this new investigation, the researchers took a broader approach. They analyzed blood samples from 94 Swiss military recruits aged 18 to 23, split evenly between 47 confirmed cannabis users and 47 non-users. Rather than targeting a single hormone, they measured hundreds of steroid hormones and related compounds circulating in the blood. This comprehensive analysis allowed for a deeper understanding of how cannabis might influence the endocrine system, which regulates many vital body functions.

    Results showed that cannabis users had testosterone levels approximately 23% higher than those of non-users. Further examination revealed that this increase stemmed specifically from the testes. Hormones produced by the adrenal glands, which also produce androgens, did not show similar changes. The findings suggest that cannabis may directly impact Leydig cells—the specialized cells inside the testes responsible for testosterone production.

    The study also identified two hormone-related substances, hydroxyprogesterone and dihydroprogesterone, which are derived from progesterone—a hormone involved in reproductive health. These compounds were significantly elevated in cannabis users and may serve as new biological markers of regular cannabis use. Tracking these markers could help researchers better understand how cannabis influences the hormonal system and monitor hormone-related changes over time.

    However, higher testosterone levels do not automatically translate into increased fertility. The relationship between testosterone and reproductive health is complex. Fertility depends on sperm count, motility, morphology, hormone balance, and various other biological factors. An increase in testosterone alone does not guarantee improved fertility.

    The researchers proposed several possible reasons for the observed testosterone increase. One theory is that the body might be compensating for reduced sensitivity of certain hormone receptors caused by cannabis exposure. Another possibility is that young men with naturally higher testosterone levels may be more inclined to engage in risk-taking behaviors, including cannabis use.

    As an observational study, it cannot establish causality—only an association between cannabis use and higher testosterone levels. The most significant strength of this research lies in its comprehensive analysis of numerous hormones rather than just a single measurement, offering a more complete view of cannabis’s potential effects on the endocrine system.

    Nonetheless, the study has limitations. Its sample size was relatively small, all participants were young Swiss men, and the findings may not apply to older individuals or those from different populations.

    Overall, these results challenge the common belief that cannabis automatically reduces testosterone levels. They also emphasize how much remains unknown about the relationship between cannabis and male fertility. Further long-term research is necessary to determine if certain levels of cannabis exposure could become harmful or if the hormonal changes observed have significant impacts on reproductive health.

    This study was published in Communications Medicine.

    Source: University of Geneva.

  • Researchers discover new connection between menopause, inflammation, and heart disease

    Researchers discover new connection between menopause, inflammation, and heart disease

    Women generally have lower rates of heart disease than men before hitting menopause. However, their risk of developing heart problems spikes sharply afterward. This pattern has puzzled scientists for years because it often occurs even when women maintain healthy lifestyles, including good diets and regular exercise.

    A recent study from the University of Texas at Arlington offers new insights into this phenomenon. The research indicates that estrogen, along with the liver and the immune system, work together to safeguard women’s heart health. When estrogen levels decline after menopause, this protective mechanism may begin to falter.

    Led by chemistry and biochemistry professor Subhrangsu S. Mandal and psychology professor Linda Perrotti, the study was published in Scientific Reports. Estrogen, one of the body’s key female hormones, influences numerous organs and systems beyond reproduction. While scientists have long known that estrogen helps regulate cholesterol and promotes heart health, the detailed biological processes behind these effects remained elusive.

    This research zeroed in on how estrogen impacts inflammation, metabolism, and liver function. The liver is crucial for managing fats, cholesterol, nutrient processing, toxin elimination, and energy regulation. The study found that when estrogen levels drop, essential liver functions become disrupted, leading to increased inflammation, unfavorable cholesterol changes, and metabolic issues linked to cardiovascular disease.

    According to Mandal, understanding the cascade of events triggered by declining estrogen post-menopause was a primary goal of the research. They identified a significant enzyme called indoleamine 2,3-dioxygenase-1 (IDO1), which is well-known in cancer studies for its role in immune cell behavior. The researchers observed that reduced estrogen levels cause an increase in IDO1 activity within the liver. This boost appears to interfere with how immune cells handle cholesterol and nutrients.

    When IDO1 activity becomes excessive, immune cells may lose their ability to efficiently clear cholesterol from the body. Over time, this could lead to a buildup of harmful cholesterol in blood vessels, raising the risk of heart disease. The study also uncovered evidence that estrogen loss impacts the whole body—not just the liver. Blood tests revealed signs of widespread inflammation, suggesting menopause may trigger a systemic inflammatory response.

    While inflammation is part of the body’s defense mechanism, chronic inflammation can damage tissues and organs over time. Long-term inflammation has been linked to a variety of health issues, including heart disease, diabetes, arthritis, and Alzheimer’s. These findings shed light on why menopause influences so many health aspects, such as osteoporosis, weight gain, fatty liver disease, infertility, autoimmune disorders, and more.

    Interestingly, restoring estrogen levels in the study reversed many of the detrimental changes observed, hinting that targeting estrogen-related pathways could be a promising strategy for future therapies. However, the scientists caution that hormone replacement therapy (HRT) isn’t a perfect solution due to potential risks like increased chances of breast or ovarian cancer. As a result, researchers are exploring safer alternatives that mimic estrogen’s protective effects without hormone replacement.

    Mandal suggests focusing on pathways involved in inflammation and metabolism—such as IDO1—may lead to the development of medications that reduce inflammation, regulate cholesterol, and decrease the likelihood of heart disease in postmenopausal women. These approaches could eventually yield simple, safe drugs to improve cardiovascular health without the risks associated with hormone therapy.

    Given that heart disease remains one of the top killers of women worldwide—and sometimes receives less attention than in men—these findings are especially significant. They illustrate that menopause impacts more than reproductive health, affecting metabolic, immune, and liver functions across the body. By connecting various biological systems, this research offers a clearer understanding of why heart disease risk rises after menopause. Still, further studies must be conducted to verify whether targeting enzymes like IDO1 can safely reduce inflammation and protect heart health without adverse effects.

    In the meantime, the hope is that this research paves the way for new, safer treatments that better protect women’s hearts after menopause. For women interested in heart health, it’s also advisable to stay informed about the best times to take vitamins for preventing heart disease and to be aware that certain supplements like calcium might harm heart health in some cases.

    Additional recent studies have shown that blackcurrants can help lower blood sugar after meals and that drinking milk might influence the risk of heart disease and certain cancers. Staying updated with such research can be beneficial for maintaining overall health.

  • How Deep Sleep Turns Your Body into a Growth Powerhouse

    How Deep Sleep Turns Your Body into a Growth Powerhouse

    Credit: Unsplash+

    Many people think of sleep as just a time to rest, but recent science reveals it’s actually one of the most active periods for body repair and growth.

    A new study from the University of California, Berkeley, published in the journal Cell, explains how deep sleep helps regulate one of the body’s most vital hormones and why missing sleep can have numerous negative health effects.

    During deep sleep, particularly the early phase called non-REM sleep, the body performs much of its rebuilding work. Muscles repair, bones strengthen, and fat is metabolized more effectively. For teenagers, this stage of sleep is especially critical because it supports normal growth and helps them reach their potential height.

    At the core of this process is a hormone called growth hormone. It’s essential for tissue development, metabolic health, and overall well-being. While scientists have known that growth hormone levels rise during sleep, they didn’t fully understand how the brain controls this process.

    To uncover this, researchers studied brain activity in mice using advanced tools that recorded signals from specific neurons and allowed control over those cells with light. This approach helped them observe what happens inside the brain during different sleep stages.

    They identified a deep brain area called the hypothalamus as the controller of growth hormone release. This ancient brain region manages many fundamental functions, with certain cells sending signals to either boost or suppress growth hormone secretion.

    Two key signals regulate this process: one promotes growth hormone release, and the other inhibits it. These signals work together to keep hormone levels balanced. During sleep—especially during deep sleep—the balance shifts to favor increased hormone release.

    The study also showed that various sleep stages influence this system differently. During REM sleep, both signals increase, leading to a substantial release of growth hormone. During non-REM sleep, one signal decreases while the other ramps up, resulting in a steadier, lower hormone secretion. This indicates sleep is a complex process with distinct stages each playing unique roles.

    An additional discovery was a feedback loop in the brain: as growth hormone accumulates, it impacts another area called the locus coeruleus, which governs alertness and wakefulness. Elevated growth hormone levels can nudge the brain toward waking, but if this area becomes overly active, it may promote drowsiness instead.

    This delicate balance ensures that sleep and wakefulness are tightly linked. Sleep boosts growth hormone, which then influences our readiness to wake up. This cycle is vital for maintaining optimal body function.

    Understanding this connection is crucial because poor sleep often leads to health issues. Growth hormone influences how the body manages blood sugar and fat. When sleep is disrupted, hormone levels drop, increasing the risk of obesity, diabetes, and cardiovascular disease.

    While these findings advance our knowledge of sleep-hormone interactions, it’s important to note that the research was conducted in mice. Further studies in humans are necessary to confirm these mechanisms, though they are likely similar.

    This research opens potential pathways for new treatments. By unraveling these brain circuits, scientists may develop therapies for sleep disorders and conditions related to hormone imbalances. It could also help in managing neurological diseases involving the same brain regions.

    Ultimately, this study highlights that sleep is much more than mere rest; it’s a meticulously regulated process essential for growth, metabolism, and brain health. Prioritizing deep sleep might be one of the most effective ways to safeguard overall health.

    If you want to boost muscle health, explore studies on factors causing muscle weakness in older adults and breakthroughs in reversing high blood sugar and muscle loss.

    For more health tips, check out recent research on simple, affordable ways to maintain muscle mass and the vegetables that are key to building strength.

    Source: University of California, Berkeley.

  • Uncovering a Hidden Root of Severe High Blood Pressure

    Uncovering a Hidden Root of Severe High Blood Pressure

    High blood pressure remains one of the most widespread health issues globally. While many individuals can manage their blood pressure with medication, some continue to experience high readings regardless of treatment, a condition known as resistant hypertension. This affects millions, including nearly 10 million Americans. For years, healthcare providers have struggled to understand why certain patients do not respond to standard therapies. Recent research from the MOMENTUM study offers new insights.

    The study revealed that over 25% of individuals with resistant hypertension have hypercortisolism, a condition characterized by excessive production of cortisol, the so-called “stress hormone.” This research, conducted across 50 U.S. medical centers and involving more than 1,000 participants, is the largest of its kind in the nation. Its findings strongly suggest that elevated cortisol levels might be a key contributor to stubborn high blood pressure.

    Cortisol is produced by the adrenal glands and plays a crucial role in responding to stress. When functioning normally, it helps regulate blood sugar, supports metabolic processes, and manages inflammation. However, chronically high cortisol levels can lead to serious health issues such as weight gain, muscle weakness, and diabetes. Additionally, cortisol influences how the body handles salt and water, which can drive blood pressure higher—a possible explanation for why some individuals remain hypertensive despite multiple medications.

    To test cortisol levels, researchers employed a straightforward method. Participants took dexamethasone, a medication administered overnight that typically reduces cortisol production. Blood samples taken the following morning showed that, in some individuals, cortisol remained elevated, indicating overproduction. Out of 1,086 participants, 297 exhibited hypercortisolism—that’s about 27%, a surprisingly high number that challenges previous assumptions. These findings highlight that excess cortisol might often be an overlooked cause of resistant hypertension.

    The study also identified other hormone-related issues. About 20% of participants had primary hyperaldosteronism, a condition where the body produces too much aldosterone, a hormone that raises blood pressure by increasing salt retention. Some individuals had both conditions, which could make blood pressure harder to control. Furthermore, those with impaired kidney function appeared more prone to high cortisol levels, hinting at a potential risk factor and emphasizing the need for targeted testing in specific populations.

    These insights underscore the importance of looking beyond standard treatments. Instead of merely increasing medication doses, healthcare providers might need to investigate underlying hormonal imbalances like hypercortisolism. Such testing could reveal hidden causes of treatment failure and guide more personalized and effective interventions.

    While these findings are promising, it’s important to note that the study does not establish a direct cause-and-effect relationship between high cortisol and resistant hypertension. Further research is warranted to determine whether reducing cortisol levels can safely lower blood pressure.

    Nonetheless, this discovery suggests that many patients could have underlying, undiagnosed conditions contributing to their high blood pressure. Identifying and addressing these issues could significantly improve health outcomes and reduce the risk of serious complications, including heart attacks and heart failure.

    The MOMENTUM study marks a significant step forward in understanding resistant hypertension. It brings to light the potential prevalence of excess cortisol and underscores the importance of personalized treatment approaches. For individuals struggling to control their blood pressure, these findings offer new hope and avenues for future intervention.

    Additionally, emerging research indicates that early time-restricted eating might help improve blood pressure, and natural coconut sugar could potentially reduce artery stiffness and blood pressure. Other studies have linked added sugar intake to higher blood pressure and shown that vitamin D supplementation may benefit those with diabetes.

    Source: Mount Sinai Health System.