Health
Vitamin D Supplements May Halve Risk of Second Heart Attack, Study Suggests
A new study suggests that targeted vitamin D3 supplementation could significantly reduce the risk of a second heart attack in people who have already suffered one. The research, conducted by a team at Intermountain Health in the United States, found that maintaining higher vitamin D levels may play a role in preventing recurring cardiac events.
The study tracked more than 600 patients who had recently experienced a heart attack. Participants were divided into two groups — one received standard post-heart attack care, while the other was given vitamin D3 supplements with the goal of raising blood levels of the vitamin to above 40 nanograms per millilitre (ng/mL). Researchers monitored each participant annually to ensure vitamin D levels remained within the target range.
The results showed that those who received vitamin D3 were about half as likely to have another heart attack compared to those who did not take the supplement. However, the study found no significant difference between the two groups in terms of heart failure, stroke, or overall mortality.
Dr. Heidi May, a cardiovascular epidemiologist and one of the study’s authors, said the findings highlight the importance of personalised treatment rather than one-size-fits-all dosing. “With more targeted treatment, when we checked exactly how supplementation was working and made adjustments, we found that patients had their risk of another heart attack cut in half,” she said in a statement.
Vitamin D is naturally produced in the body through sunlight exposure, yet deficiency remains widespread. Around 13 per cent of Europeans are severely deficient in the vitamin, according to existing health data. In the study, more than half of the participants who received vitamin D3 supplements needed an initial dose of 5,000 international units (IU) — significantly higher than the typical recommendation of 600 to 800 IU per day — to achieve optimal blood levels.
While no adverse effects were reported among participants, health experts caution against excessive supplementation. Consuming more than 4,000 IU of vitamin D daily can cause health issues such as kidney stones or elevated calcium levels in the blood.
The research team presented their findings at an American Heart Association conference in the United States. Although the results are promising, the study has not yet been published in a peer-reviewed journal, and the researchers stressed the need for further investigation.
Previous studies on vitamin D and heart health have produced mixed results. Many earlier trials used fixed doses of vitamin D regardless of individual deficiency levels, which may explain the lack of consistent findings. The Intermountain Health team believes that their tailored approach — adjusting supplements based on each patient’s blood levels — may account for the improved outcomes.
Dr. May noted that while the results are encouraging, additional research is necessary to confirm the benefits. “We’re excited with these results but know we have further work to do to validate these findings,” she said.
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
Europe Records Sharp Rise in Sexually Transmitted Infections, ECDC Warns
Health
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