A recent study indicates that consuming ultra-processed meals can lead to prolonged insulin elevations compared to whole food meals, even when calorie, carbohydrate, fat, protein, and salt content are matched. Frequent high insulin levels are associated with an increased risk of developing type 2 diabetes and other chronic health issues.
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The study, published in the journal *Nature Metabolism*, involved approximately 30 healthy adults aged 18 to 45, who were monitored in a controlled environment after consuming two different meals: one minimally processed and the other ultra-processed. Both meals were designed to have 300 nutritionally comparable calories. The minimally processed meal included a sliced banana, dried cranberries, cheese, and a hard-boiled egg, while the ultra-processed meal consisted of a peanut butter and jelly sandwich, deli turkey, veggie chips, a cookie, cereal, and instant mashed potatoes.
Participants' metabolic responses were analyzed through blood samples taken after the meals. Although their blood sugar levels were similar after both meals, the levels remained elevated for a longer time following the ultra-processed meal. Insulin levels, however, were significantly higher during the 40 to 120-minute period post-meal for the ultra-processed food, indicating a different metabolic response.
Study co-author Alexandra DiFeliceantonio expressed surprise at the results, noting the initial assumption that ultra-processed foods would also markedly affect blood sugar levels. She suggested that the ultra-processed foods might be "predigested", making their nutrients more readily available and potentially resulting in a quicker insulin response. Sandra Zhang, a registered dietitian-nutritionist, supports this view, stating that the easier digestibility of ultra-processed foods likely contributes to a rapid insulin response, although the precise mechanisms remain unclear.
DiFeliceantonio warned that elevated insulin levels can progress to insulin resistance, a precursor to type 2 diabetes. While the immediate effects of the study were short-lived, the authors contend that regular consumption of ultra-processed foods could heighten the risk of chronic metabolic diseases.
Experts caution that in real-world scenarios, where individuals consume larger quantities of ultra-processed foods, the negative effects may be amplified. The engineered appeal of these foods often leads to overconsumption, increasing intake of refined carbohydrates and added sugars.
The study does have limitations, including its small sample size and the potential influence of different protein sources in the meals. Meals were also consumed at varying rates, potentially affecting metabolic responses. Nonetheless, the findings underscore the importance of examining food processing levels and their impact on health, beyond just nutritional content. Zhang advocates for prioritizing minimally processed foods while enjoying ultra-processed options in moderation.