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
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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