16-week behavioral intervention reduces caloric intake by 461 ± 931 kcal/day and UPF proportionBehavioral Weight Management Reduces Ultra Processed Food Intake

Obesity (Silver Spring, Md.) Published August 2, 2026 Study authors: Worwag Kate E, Shetty Armaan, Shankar Meena N, Ross Kathryn M PubMed ↗ NCT04116853 ↗ DOI ↗ Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

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Key Takeaway

Note that reduced ultra-processed food intake is associated with weight loss independent of caloric changes in adults with obesity.

This secondary analysis of an RCT included 449 adults with obesity participating in a 16-week behavioral weight management intervention (BWLI). The primary outcomes were changes in caloric intake and the proportion of calories from ultra-processed foods (UPF).

Participants showed significant reductions in daily calorie intake (-461 ± 931 kcal/day, p < 0.001) and a decrease in the proportion of calories from UPFs (-3.0% ± 2.8%, p < 0.001). Additionally, body weight decreased by -7.2 ± 7.6 kg (p < 0.001). A small positive correlation was found between UPF reduction and caloric intake (r = 0.10).

A significant association was observed between UPF reduction and weight loss when adjusted for caloric intake (r = 0.08, p = 0.005). However, the study noted that these associations had small effect sizes. No data regarding adverse events or tolerability were reported.

Clinical application is limited by the single-arm nature of the analysis and the small effect sizes for specific correlations. The finding suggests that reducing UPF intake may contribute to weight loss independently of total caloric changes, but evidence remains preliminary.

How this fits prior evidence

How this fits prior evidence: This finding addresses a gap in behavioral interventions for obesity by specifically examining ultra-processed food (UPF) consumption. While previous coverage noted that intermittent fasting and calorie restriction effectively reduce weight through different behavioral pathways, this study provides specific data on the impact of reducing UPFs within a 16-week behavioral program.

Researchers analyzed a study involving 449 adults living with obesity who participated in a 16-week behavioral weight management intervention. The goal was to track changes in daily calorie intake and the amount of calories coming from ultra processed foods (UPFs).

The results showed that participants significantly decreased their daily calorie intake and reduced the proportion of calories from ultra processed foods. Specifically, those who cut back on these types of foods saw a link to greater weight loss. This relationship remained even when researchers adjusted for total calorie changes.

While the study shows a positive link between eating fewer ultra processed foods and losing weight, the effect sizes were small. Because this was a single-arm study with limited data on specific side effects, these results should be viewed as preliminary. It suggests that behavioral changes regarding food processing may play a role in weight management.

What this means for you:

Reducing ultra processed food intake was linked to more weight loss in adults over 16 weeks.

Common questions

What is an ultra processed food?

Ultra processed foods are products that typically contain many additives, preservatives, and industrial ingredients. In this study of 449 adults, participants who reduced their intake of these specific types of foods showed a link to better weight loss outcomes over a 16-week period.

How much weight did participants lose?

Participants in the 16-week program lost an average of 7.2 kilograms. The study also found that reducing ultra processed foods was associated with more weight loss, even when looking at calories separately from the type of food eaten.

Is this a proven way to lose weight?

The study shows a link between less ultra processed food and weight loss, but the effect sizes were small. Because it was a single-arm study, these results are not definitive proof of cause. You should talk to your doctor about the best plan for your health.

Study Details

Study typeRct

EvidenceLevel 2

Follow-up3.7 mo

PublishedAug 2026

PMID42446055

TrialNCT04116853

View Original Abstract ↓

OBJECTIVE: Increasing evidence links ultra-processed food (UPF) intake to obesity and related diseases; however, little is known about the role of UPF in behavioral weight-loss interventions (BWLIs). Thus, the current study investigated whether UPF intake changes during a BWLI and whether these changes are associated with weight-loss outcomes. METHODS: A total of 449 adults with obesity (mean ± SD age = 49.5 ± 11.4 years, BMI = 35.7 ± 4.0 kg/m, 83.5% female, 23.4% Black/African American, 9.8% Hispanic) completed a 16-week BWLI. Using dietary intake data collected via the Automated Self-Administered 24-Hour Dietary Assessment Tool (ASA24), we examined (1) changes in caloric intake and the proportion of calories from UPFs from baseline to post-intervention and (2) associations between these changes and weight loss, overall and adjusting for caloric intake. RESULTS: Participants demonstrated reductions in calorie intake (-461 ± 931 kcal/day), UPF intake (-3.0% ± 2.8% of total energy), and body weight (-7.2 ± 7.6 kg) over the BWLI, ps < 0.001. Greater reductions in UPFs were associated with greater decreases in caloric intake (r = 0.10) and greater weight loss (r = 0.08, ps < 0.001), even after adjusting for changes in caloric intake (p = 0.005); however, effect sizes were small. CONCLUSION: UPF intake decreased during the BWLI, and greater reductions were associated with greater weight loss, independent of caloric changes, though small effect sizes warrant cautious interpretation. Future research should examine whether targeting UPF reduction in a BWLI enhances weight outcomes. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT04116853.

16-week behavioral intervention reduces caloric intake by 461 ± 931 kcal/day and UPF proportionBehavioral Weight Management Reduces Ultra Processed Food Intake

How this fits prior evidence

Common questions

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