Research indicates that ultra-processed foods may contribute to prolonged spikes in insulin levels after meals, even when caloric and macronutrient content is similar to minimally processed options. The average American gets up to 55 percent of their daily calories from these foods, which researchers believe may pose health risks due to their processing rather than just nutritional content.
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Alexandra DiFeliceantonio, PhD, a neuroscientist and associate professor at Virginia Tech's Fralin Biomedical Research Institute, noted that ultra-processed foods often contain higher levels of calories, fat, and sugar. The study, published in the journal Nature Metabolism, aimed to investigate if the health impacts of ultra-processed foods hold true even when meals have equivalent nutritional profiles.
Thirty healthy adults aged 18 to 45 participated in the study, consuming two meals spaced three days apart. Each meal contained 300 calories with matched macronutrients, consisting of a minimally processed meal featuring a sliced banana, cheese, and a boiled egg, and an ultra-processed meal including peanut butter and jelly, deli turkey, and various snacks.
Blood samples were collected after the meals, revealing that while blood sugar levels were similarly high post-meal regardless of food type, insulin levels remained elevated longer after consuming ultra-processed foods. Insulin levels were notably higher between 40 and 120 minutes after the ultra-processed meal compared to the minimally processed one.
DiFeliceantonio expressed her surprise at the findings, initially questioning the data due to unexpected insulin responses, which may result from ultra-processed foods being easier to digest, leading to quicker nutrient availability. Sandra Zhang, a registered dietitian-nutritionist, emphasized that this faster digestion could potentially heighten insulin response, although the precise mechanisms remain unclear.
High insulin responses raise concerns about insulin resistance, a precursor to type 2 diabetes. DiFeliceantonio cautioned that while the observed effects were short-term, frequent consumption of ultra-processed foods could increase the risk for chronic metabolic diseases, including obesity.
However, Zhang noted that typical consumption patterns may differ, as individuals often eat larger quantities of these foods, leading to greater calorie intake and potentially elevated blood sugar levels due to added sugars.
The study has some limitations; it included a small sample size and variations in protein sources between meals may have influenced results. Additionally, participants tend to consume ultra-processed options more rapidly, which could impact bodily responses.
Experts advocate for a greater awareness of food processing and its effects on health. DiFeliceantonio suggested that rather than reiterating that ultra-processed foods are unhealthy, it’s essential to consider wider food environments and potential systemic changes. Zhang encouraged prioritizing minimally processed foods while enjoying ultra-processed ones in moderation.