Certain fats commonly used in infant formulas may contribute to early signs of steatotic liver disease, a condition formerly known as non-alcoholic fatty liver disease, according to a new study from Virginia Tech. The research, published in the American Journal of Physiology-Endocrinology and Metabolism, suggests that specific medium-chain fats found in some formulas may strain the developing liver in ways that differ from how the condition manifests in adults.
The study adds to a growing body of research examining the link between early nutrition and long-term health. While breast milk remains the gold standard for infant nutrition, many parents rely on formula, making it crucial to understand the impact of its components on infant development. The findings come as regulatory bodies reevaluate infant formula composition, aiming to improve both safety and nutritional quality.
Researchers, led by Associate Professor Samer El-Kadi of the School of Animal Sciences at Virginia Tech, used a neonatal pig model to investigate how different fats affect liver metabolism. Pigs were chosen for the study due to the fact that their digestive systems and fat metabolism closely resemble those of human infants. The team tested two simplified formulas: one rich in medium-chain fatty acids, often derived from coconut oil, and another rich in long-chain fatty acids from animal fat. The results showed that piglets fed the medium-chain fat formula accumulated liver fat more rapidly than those fed the long-chain fat formula, despite receiving the same amount of calories and protein.
“Even within seven days, we could see fat starting to build up in the liver,” said El-Kadi. “By about two weeks, it had progressed from simple steatosis to a more severe inflammatory form of the disease.” This rapid accumulation is particularly concerning because the developing liver responds differently to fat buildup than an adult liver. In adults, fat accumulates when the liver’s ability to burn fat slows down. However, in the piglet model, the researchers observed fat accumulation even as fat burning increased.
“We saw the liver activate both fat-making and fat-burning pathways at the same time,” El-Kadi explained. “Even with those adaptive responses, the developing liver became overwhelmed. That was surprising to us. Based on what we know from adult disease, increased fat burning should have been protective.”
Steatotic Liver Disease: A Growing Concern in Infants
Steatotic liver disease, once primarily associated with obesity in adults, is increasingly being diagnosed in children and even infants. This rise in cases raises questions about the role of early nutrition in liver health. According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), non-alcoholic fatty liver disease (NAFLD) affects an estimated 11% of U.S. Adults and is becoming more common in children.
The research team emphasizes that the study does not suggest parents should avoid infant formula. “Breast milk remains ‘the gold standard’ for infant nutrition, and formula is a critical and often lifesaving alternative when breastfeeding is not possible or sufficient,” El-Kadi stated. He even shared a personal anecdote, noting that his own child benefited from formula when needed. “The immediate benefits of feeding far outweigh any potential long-term risks. Our goal is not to discourage formula utilize. It’s to understand how different components of formula affect the developing body, so they can be improved over time.”
Operation Stork Speed and Future Research
This research coincides with the U.S. Department of Health and Human Services and the Food and Drug Administration’s Operation Stork Speed initiative, which aims to improve the safety and nutritional quality of infant formula. The initiative encourages research into formula composition and manufacturing processes.
El-Kadi’s team is continuing to investigate the effects of specific fatty acids on liver metabolism during early life. They are exploring whether different types of medium-chain fatty acids have varying impacts and determining optimal quantities for infant formulas. “If we understand how early nutrition shapes liver metabolism, that knowledge can eventually help guide better nutritional strategies,” El-Kadi said.
The findings underscore the importance of ongoing research into infant nutrition and the complex interplay between diet and liver health. As regulatory bodies continue to evaluate formula composition, this research will provide valuable insights for optimizing infant formulas and supporting healthy development.
Disclaimer: This article provides informational content and should not be considered medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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