A recent analysis of 51 studies involving 8.8 million adults found that consuming an additional 3.5 ounces (100 grams) of ultra-processed foods daily is associated with increased risks of heart disease, cancer, and death. Despite their prevalence in modern diets, particularly among packaged snacks, sugary drinks, and instant noodles, no safe consumption level for these foods has been established.
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The research indicates that higher intake of ultra-processed foods correlates with a range of health issues. Those eating the most had a 31% higher risk of digestive diseases, a 27% higher likelihood of experiencing depression or anxiety, and a 24% increased risk of heart attacks and strokes. Other significant risks included a 23% increase in obesity, a 12% higher risk of cancer, and an 18% increase in mortality from any cause.
The study, led by Xiao Liu at Duke-NUS Medical School in Singapore and Sun Yat-sen Memorial Hospital in China, highlights that each additional 100 grams of ultra-processed food raises cardiovascular risk by 14%, while the risk of high blood pressure increases by 11%. Liu mentioned that the reported figures reflect average effects across the dataset rather than a definitive threshold separating safe and unsafe consumption.
Ultra-processed foods, characterized by heavy industrial processing and various additives, accounted for 53.0% of adult caloric intake in the U.S. from 2021 to 2023. The study utilized data from an extensive timeframe, with participants' ages ranging between approximately 24 and 77 years.
Liu noted that current evidence does not provide a clearly defined safe intake level, suggesting that different diseases may have varying thresholds. He encouraged consumers to reduce ultra-processed food consumption and opt for healthier, minimally processed alternatives.
The study also discussed potential interactions among additives in ultra-processed foods, which may exacerbate health risks beyond what any single additive could cause. However, due to reliance on self-reported dietary records, which can be prone to underreporting, the researchers cautioned that the links may not be fully accurate.
While there is ongoing research into which specific products pose the highest risk, Liu advises consumers to choose foods that resemble natural products rather than heavily processed items. The full study has been published in the journal Family Medicine and Community Health.