Health
Experts Warn That Disrupted Body Clocks Could Harm Heart Health
Heart health specialists are warning that disruptions to the body’s natural circadian rhythm—the internal 24-hour clock that governs sleep, hormones, digestion, and body temperature—can have serious health consequences, including a higher risk of heart disease and diabetes.
A new scientific statement from the American Heart Association (AHA) highlights growing evidence that irregular sleep, eating patterns, shift work, jet lag, and nighttime light exposure can interfere with the body’s ability to regulate metabolism, blood pressure, and hormones. These disruptions, experts say, may contribute to obesity, hypertension, and type 2 diabetes.
“Regular interruptions to the body clock are much more than simple inconveniences like staying up too late or waking up too early,” said Dr. Kristen Knutson, an associate professor of neurology at Northwestern University in the United States. “Aligning our daily behaviours—when we sleep, eat, and move—with our internal clock is important to support optimal cardiometabolic health.”
To help people realign their body clocks and improve wellbeing, heart health experts have outlined several practical steps:
1. Get light in the morning, avoid it at night
Light is the main environmental signal that helps the brain regulate the circadian rhythm. Experts recommend getting natural daylight early in the morning to improve alertness and mood. At night, however, even small amounts of light—especially from screens—can suppress melatonin, the hormone that promotes sleep.
2. Keep a consistent sleep schedule
Going to bed and waking up at the same time each day, including weekends, helps maintain the body’s internal rhythm. The AHA notes that irregular sleep patterns have been linked to obesity and metabolic disorders, even in people who get sufficient sleep overall.
3. Eat earlier in the day
Late-night meals or irregular eating patterns can disrupt the body’s metabolic rhythm, particularly in organs like the liver and pancreas. Research suggests that eating earlier, such as having breakfast before 8 a.m., is associated with better heart and metabolic health.
4. Time your exercise
While the best time to work out varies from person to person, exercise timing can influence blood pressure, glucose control, and sleep quality. Morning or afternoon workouts may help advance the body clock, while evening exercise can delay it.
5. Monitor your rhythm
Although the circadian rhythm can be difficult to measure directly, wearable devices that track heart rate and skin temperature may help individuals understand their natural patterns.
Knutson said it’s time for both individuals and healthcare professionals to pay more attention to the body’s internal clock. “Everyone has an internal clock, and it’s time we start listening to it,” 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.
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