近日，有"水果贵族"之称的车厘子价格大幅跳水，让不少人实现了"车厘子自由"。让人心动的不止价格，还有"助眠"这一新卖点："车厘子含有褪 黑素能助眠"的话题登上微博热搜。 近年来，褪黑素成为睡眠困难、倒时差人群的"救星"和"必备品"，宣称含有褪黑素的商品纷纷上市并受到追捧。去年以来，各类"晚安奶""助眠 饮"悄然走红。社交平台上，不少网友称"喝完秒睡""多年浅眠，喝完能安睡整晚"。 那么，褪黑素是什么？晚安奶的"助眠"原理是什么？车厘子真能助眠吗？什么品种的车厘子褪黑素含量更高？还有哪些食物富含天然褪黑素？ 01.年纪越大，褪黑素合成越少 褪黑素的发现，源于科学家对松果体功能的好奇。 松果体是脊椎动物大脑中的神经内分泌腺，因形似松果而得名。20世纪初，美国约翰斯·霍普金斯大学的研究人员将牛的松果体碾碎后喂给蝌蚪， 约30分钟后，蝌蚪的皮肤颜色明显变浅，甚至内脏都变得透明。后续研究发现，松果体内的活性因子促使蝌蚪皮肤黑色素细胞中的色素颗粒聚 集、抑制其扩散，从而使皮肤"褪色"。这项实验首次证明了松果体的生物学活性，为后来褪黑素的分离鉴定奠定了基础。 1958年，美国耶鲁大学的研究人员通过历时4年的研究，从近20万 ...

Core Viewpoint - Seasonal Affective Disorder (SAD) is a health issue closely related to seasonal changes, particularly affecting individuals during winter months, leading to symptoms such as low mood, reduced energy, and loss of interest in daily activities [4][5]. Group 1: Understanding Seasonal Affective Disorder - SAD typically manifests in specific seasons, most commonly in autumn and winter, with symptoms alleviating in spring and summer, hence referred to as "winter depression" [4]. - The disorder is distinct from regular depression due to its "seasonal correlation," being more prevalent in high-latitude regions with prolonged winter [4]. Group 2: Mechanisms Behind SAD - The pathophysiology of SAD is complex, involving biological, environmental, and psychological factors [5]. - Changes in seasonal light exposure are a critical influencing factor, affecting the production of key mood-regulating substances [6][7]. Group 3: Role of Light in Mood Regulation - Light exposure is essential for the body's "emotional factory," which produces melatonin and serotonin, both of which are significantly influenced by light levels [8]. - Melatonin, responsible for regulating sleep, increases in dark environments, leading to excessive daytime sleepiness during winter due to reduced daylight [10][13]. - Serotonin, which contributes to feelings of well-being, decreases with reduced light exposure, resulting in mood disturbances and lack of interest in activities [14]. Group 4: Physical and Behavioral Changes in Winter - Winter conditions lead to slower metabolism and decreased physical activity, further exacerbating mood issues due to reduced light and social interaction [16]. Group 5: Strategies for Managing SAD - Sun exposure is the most direct method to regulate mood, with recommendations to spend 15-30 minutes outdoors in sunlight, even on cloudy days [18]. - Consuming foods rich in tryptophan, such as bananas and nuts, can support serotonin production [19]. - Vitamin D synthesis is reduced in winter; thus, dietary sources like eggs and fatty fish, or supplements, may help mitigate mood decline [21]. - Regular physical activity, such as moderate exercise 3-4 times a week, can enhance blood circulation and promote the release of endorphins [22].

松果体 （ pineal gland ） 是大脑中的一个小型内分泌腺体，因其形状类似于松果而得名。尽管它体积很 小 （大约只有米粒大小） ，但它扮演着非常重要的角色。其最核心的功能是通过分泌 褪黑素 （ melatonin ） 来调控调控人体的睡眠-觉醒周期。在白天或光线充足时，松果体活动被抑制，褪黑素分泌减 少，使人保持清醒和活跃；到了夜晚或黑暗环境中，松果体变得活跃，开始大量分泌褪黑素，促使人体产 生困意，准备入睡。 然而，由于松果体难以获取，这严重限制了对其进行研究。 近日，耶鲁大学 In-Hyun Park 团队在 Cell 子刊 Cell Stem Cell 上发表了题为： Generation of human pineal gland organoids with melatonin production for disease modeling 的研究论文。 该研究首次构建了能够产生 褪黑素 的 人类松果体类器官 （ hPGO ） ，成功 模拟了松果体的发育与功 能，并揭示了其可用于疾病建模和细胞治疗的潜力。 在这项最新研究中，为了突破松果体来源的限制，研究团队利用 多能干细胞 （PSC） 开 ...

Group 1 - The discussion around cherries containing melatonin and its potential to aid sleep has gained significant attention [1] - Melatonin is a hormone that regulates the sleep-wake cycle, primarily secreted by the pineal gland, and is referred to as the "night hormone" [1] - Cherries do contain natural melatonin, but in very low amounts, serving only as a mild aid for sleep rather than a treatment for insomnia [5] Group 2 - The response to melatonin varies among individuals, making it difficult to determine the exact amount of cherries needed to aid sleep [5] - The glycemic index of cherries ranges from 22 to 29, indicating they are blood sugar friendly, although darker cherries may have a higher glycemic index [5] - The recommended daily intake of cherries for an average person is between 100 to 150 grams, or about 10 to 15 cherries, according to the 2022 Dietary Guidelines for Chinese Residents [5]

Core Viewpoint - Melatonin is effective for only a limited group of insomnia patients, and self-medication by increasing dosage is discouraged [1] Group 1: Melatonin and Insomnia - Melatonin products, such as sleep tablets and gummies, are popular in the sleep economy market aimed at improving sleep quality [1] - Melatonin is beneficial primarily for individuals who have a deficiency of this hormone, and it is not suitable for everyone [1] - Approximately 25% to 33% of insomnia patients may benefit from melatonin, specifically those with mild insomnia [1] Group 2: Risks of Overuse - Patients who increase their melatonin dosage without medical advice may experience adverse effects, including liver damage, nausea, and vomiting [1] - It is advised that individuals who do not see results from melatonin after a few uses should consult a healthcare professional rather than self-adjusting their dosage [1] Group 3: Recommendations for Better Sleep - To achieve high-quality sleep, it is recommended to engage in regular exercise, avoid heavy meals before bedtime, and create a dark and comfortable sleeping environment [1] - Relying on weekend catch-up sleep after insufficient sleep during the week is discouraged, as it can lead to irreversible harm from chronic sleep deprivation [1] - Maintaining a relaxed mindset and a regular sleep schedule is emphasized as the best approach to improving sleep quality [1]

Core Findings - An international study has identified a key protein (SIRT6) that regulates tryptophan metabolism, significantly impacting sleep, mood, and neurodegenerative diseases, providing new research directions for treatment [1][2] Group 1: Tryptophan Metabolism - Tryptophan is a precursor for serotonin and melatonin synthesis, with serotonin playing a crucial role in mood regulation and melatonin maintaining circadian rhythms and promoting sleep [1] - The study found that aging and neurodegenerative diseases can disrupt tryptophan metabolism, although the underlying molecular mechanisms were previously unclear [1] Group 2: SIRT6's Role - Researchers discovered that SIRT6 acts as a "gatekeeper" in maintaining the balance of tryptophan metabolism by actively regulating the expression of related genes [1] - A decline in SIRT6 activity due to aging and neurodegenerative diseases leads to a shift in tryptophan metabolism towards the kynurenine pathway, resulting in decreased serotonin and melatonin production and increased neurotoxins [1] Group 3: Reversibility of Damage - The damage caused by the accumulation of neurotoxic metabolites is not irreversible; in SIRT6-deficient fruit fly models, researchers successfully reversed the accumulation by altering SIRT6-regulated genes, protecting brain tissue and improving motor behavior [2] - This research offers new targets for treating age-related cognitive impairments, insomnia, and depression [2] Group 4: Publication - The research findings have been published in the journal Nature Communications [3]

Core Viewpoint - Melatonin is often perceived as a natural solution for insomnia, but its use carries significant health risks and is not a universal remedy for sleep disorders [2][6]. Group 1: Melatonin and Its Effects - Melatonin is a hormone secreted by the pineal gland, primarily increasing in production during the evening to promote sleep [4]. - Over-the-counter melatonin supplements are exogenous and act as "rhythm regulators," potentially effective for jet lag but not for insomnia caused by anxiety or other physical conditions [6]. - Long-term use of melatonin can suppress the body's natural production of the hormone, leading to rebound insomnia or dependency upon cessation [8]. Group 2: Risks of Self-Medication - Self-medicating with melatonin or combining it with other sleep aids, such as sedatives, can mask underlying conditions like depression or anxiety, delaying proper diagnosis and treatment [9]. - Anxiety and depression can exacerbate insomnia, and without addressing these root causes, sleep issues may persist, potentially leading to increased reliance on sleep medications [11]. Group 3: Recommendations for Sleep Improvement - For short-term insomnia, mild interventions like certain herbal supplements may be acceptable, but persistent symptoms lasting over two weeks should prompt a visit to a specialist for targeted treatment [12]. - A comprehensive approach to improving sleep includes timely medical consultation, adjustment of sleep habits, regular exercise, balanced diet, and emotional regulation [12][14].

Core Insights - Cross-border e-commerce is a feasible shortcut for importing melatonin, providing a unique pathway for overseas health products within the regulatory framework [1] Group 1: Advantages of Cross-Border E-Commerce - Exemption from initial registration/filing: Products listed in the "Cross-Border E-Commerce Retail Import Product List" can temporarily avoid the lengthy and costly "blue hat" registration process, significantly lowering market entry barriers [1] - High customs efficiency and logistics experience: The "bonded stockpiling" model allows for rapid customs clearance and delivery, achieving next-day delivery comparable to domestic e-commerce [1] - Direct access to consumers for quick market testing: Platforms like Tmall International and JD International enable new brands to quickly establish recognition and gather feedback, making it an ideal way to test the Chinese market [1] Group 2: Compliance Requirements - Adherence to the "personal use" principle: All products must be sold directly to end consumers, with no domestic resale allowed [3] - Transaction limit management: Single transaction limit is ≤5000 yuan, and annual personal transaction limit is ≤26000 yuan [4] - Positive list management: Products must be included in the latest cross-border e-commerce retail import product list [5] - Full data integration: E-commerce platforms must connect with customs systems to ensure accurate reporting of orders, payment slips, and logistics slips [6] Group 3: Import Process for Melatonin - Step 1: Preliminary qualifications and filing: Overseas companies must authorize a domestic enterprise as an agent to register with customs for cross-border e-commerce [7] - Step 2: Bonded warehouse stockpiling and storage: Products are shipped in bulk to China, undergo customs declaration, and are managed under customs supervision [10] - Step 3: Sales and final delivery: Consumers place orders, and after customs clearance, packages are delivered directly from the bonded warehouse to consumers [11] Group 4: Key Compliance Points and Long-Term Planning - Product compliance is fundamental: Ensure product ingredients meet Chinese regulations and provide basic information through websites or QR codes [13] - Strict prohibition on secondary sales: Reselling products purchased through cross-border e-commerce channels domestically is illegal [13] - Regular monitoring of the positive list: Brands should frequently check the "Cross-Border E-Commerce Retail Import Product List" to ensure their products remain compliant [13] - Handling returns and unsold items: Returned products must go back to the bonded warehouse, and long-term unsold items must be either re-exported or destroyed under customs supervision [14] - Long-term planning: Brands intending to enter offline retail channels should simultaneously initiate "blue hat" registration or filing applications while conducting cross-border e-commerce [14]

Core Viewpoint - Melatonin supplements are exogenous hormone supplements that act as "rhythm regulators" rather than "sleep aids," and they may be effective for sleep disturbances caused by circadian rhythm disruptions, such as jet lag and shift work [1] Group 1 - Melatonin may have some effectiveness for insomnia caused by circadian rhythm disorders, but it does not address all types of insomnia [1] - Conditions such as anxiety, stress, depression, chronic pain, medication side effects, and other sleep disorders may limit or negate the effectiveness of melatonin supplementation [1] - Long-term or excessive use of melatonin may impact the body's natural melatonin production [1]

Core Points - The article emphasizes the health risks associated with staying up late, particularly the increased risk of sudden cardiac death due to sleep deprivation and related factors [1][2][4][6]. Group 1: Sleep Deprivation Effects - Continuous lack of sleep for more than three days, with less than four hours of sleep each day, can lead to significant heart strain, increasing myocardial oxygen consumption by three times and raising the likelihood of vascular spasms to five times the normal rate [2]. - Staying awake for 24 hours without compensatory sleep can cause a sharp rise in blood pressure, making even minor physical exertion potentially dangerous for the heart [3]. - Long-term sleep deprivation, defined as less than six hours of sleep per day, combined with chronic conditions like hypertension and diabetes, can accelerate plaque formation in blood vessels due to increased inflammatory factors [4][5]. Group 2: Warning Signs and Symptoms - Symptoms indicating potential heart issues after staying up late include severe fatigue, chest pain, cold sweats, and difficulty breathing, which may signal a heart attack [6]. - The phenomenon of heart palpitations, known as premature beats, can occur during late-night activities, with functional and pathological types distinguished by their frequency and associated symptoms [10][11]. Group 3: Sleep Recommendations - To mitigate the effects of staying up late, it is recommended to take short naps, maintain a light diet rich in B vitamins and proteins, and engage in moderate physical activity during the day [12][14][16].