A recent study hints that sticking to a whole-food diet might allow individuals to consume more food while losing weight. Published in the American Journal of Clinical Nutrition, the research found that participants following an unprocessed diet ate 57% more food by weight compared to those indulging in ultra-processed options, yet they averaged about 330 fewer calories per day.
The researchers believe the key difference is how ultra-processed foods disrupt the body’s natural reactions to whole foods. Conducted by scientists from the University of Bristol in collaboration with U.S. nutrition experts, the study reexamined data from a notable clinical trial led by Dr. Kevin Hall, an NIH researcher. It concluded that those consuming ultra-processed foods took in roughly 500 extra calories a day, contributing to weight gain.
Interestingly, it appears that those eating unprocessed foods tend to gravitate towards larger portions of fruits and vegetables, while passing on more calorie-rich items like pasta or steak. Jeff Brannstrom, the lead author of the study, indicated that people may have an inherent ability to regulate nutrition and fullness, but this works best when the food is not heavily processed.
Brannstrom reflected on how individuals offered unprocessed options tend to select foods that strike a balance between taste, nutrition, and satisfaction, ultimately leading to reduced energy intake. He noted that when foods are presented in their natural state, it seems that people make smarter choices than previously thought.
Experts outside the study echoed these conclusions as they align with clinical observations. Dr. Frank Dumont from Verta Health Colorado mentioned that this research expands understanding regarding the metabolic issues facing the American population. He pointed out that our modern reliance on ultra-processed foods presents a challenge, as these foods often bear little resemblance to their natural ingredients. If we’ve evolved to evaluate nutritional content, then masking the original components in food can hinder our ability to recognize what’s healthy.
Theresa Link, a registered dietitian with Virta Health, felt it wasn’t surprising that whole foods enable people to consume more without gaining weight. She identified that whole foods—like fruits, vegetables, healthy fats, and high-fiber grains—are rich in fiber and protein. This combination generates more fullness, decreasing the desire to overeat.
Link also highlighted the contrast with highly processed foods, which are engineered to be overly appetizing. The ideal mix of salt, fat, and sugar creates a reward response in the brain, often leading to overeating. However, it’s crucial to note that the study included just 20 participants and was conducted over a four-week period in strict conditions, leading some experts to emphasize the complexity of real-world eating habits.
Dr. Jennifer Brown, a West Virginia bariatric specialist, acknowledged that managing weight becomes simpler when individuals steer clear of calorie-dense, ultra-processed foods in favor of nutritious whole foods. If validated, these findings could underline the health benefits of whole foods in maintaining a healthy weight compared to processed options. The authors of the study have yet to provide additional comments on their findings.
