Micro- and nanoplastic particles were present in the coronary blood of 84% of patients suffering an acute myocardial infarction, compared with 40% of those with chronic ischaemic heart disease and 32% of individuals with healthy coronary arteries, according to a clinical study of 61 patients published in the European Heart Journal. Researchers from Sapienza University of Rome and the University of Campania detected a wider variety of polymers in the infarction group, with polyethylene—common in packaging—predominating. The findings represent one of the first clinical observations linking plastic particles in the bloodstream to the severity of heart attacks.

The same study found that exposure to fine particulate matter (PM2.5) raised the likelihood of accumulating microplastics in the blood, while smokers faced a roughly sixfold higher risk. The authors describe a synergistic effect in which tobacco smoke, air pollution, and plastic particles amplify cardiovascular damage. Separately, a Climate Central analysis of 1,338 cities estimated that the average person lost nearly 56 hours of sleep per year between 2020 and 2025 due to heat, with more than 10% of that loss attributable to climate change. Research on heat and mental health, reviewed by Italian media, notes that prolonged high temperatures increase irritability and aggression, partly because the body’s effort to cool itself—vasodilation, elevated heart rate, sweating—mimics the physiological arousal of anger, making emotional regulation harder.

A longitudinal study of 569 individuals in Denmark and the UK, published in the International Journal of Cardiology, found that severe childhood dental caries was associated with a 45% higher incidence of cardiovascular disease in women and 32% in men later in life. The researchers point to chronic inflammation and oral bacteria entering the bloodstream as plausible mechanisms. Meanwhile, a controlled trial at Columbia University with 95 adults, reported in the Annals of Internal Medicine, showed that cutting sleep by 80 minutes per night led to an average weight gain of 0.45 kg over six weeks, driven by increased sedentary time and hormonal shifts that boost hunger and cravings for calorie-dense foods. Physical symptoms of stress, such as muscle tension and headaches, are also increasingly recognised as early indicators of chronic strain, Mayo Clinic and NHS guidance notes.

Chronic kidney disease, which affects an estimated 10% of adults globally, continues to be driven primarily by diabetes and hypertension, with obesity emerging as a third major accelerator, according to Brazilian and Indonesian health reports. Lower fluid intake during winter, common among the elderly, raises the risk of urinary infections and kidney stones, Rio de Janeiro’s state health secretariat warned. Across these studies, the common thread is the interplay of environmental exposures and behavioural patterns with long-latency diseases. The Italian microplastics research team acknowledges the small sample size and says larger multi-centre studies are now needed to establish whether reducing plastic exposure could lower cardiovascular risk.