The study was a systematic review and meta-analysis of randomized trials which included intake of nuts with and without dietary substitution instructions. In the fifty-five randomized trials analyzed, participants daily consumption was tracked along with their body weight (BW), body-mass index (BMI), waist circumference (WC), and total body fat percentage (BF%), depending on the clinical trial. At the conclusion of the analysis, there was no change in the BW of participants from the standardized mean difference. In the studies that included dietary substitution instructions, there was also no change in BW and a significant decrease in BF%. BMI and WC were unchanged for both categories of studies.
 
In conclusion, nut-enriched diet interventions did not lead to changes in BW, BMI, or WC. There was a decrease in BF% for trials that included substitution instructions, although these results require more research.
 
Guarneiri, L. L., & Cooper, J. A. (2020). Intake of Nuts or Nut Products Does Not Lead to Weight Gain, Independent of Dietary Substitution Instructions: A Systematic Review and Meta-Analysis of Randomized Trials. Advances in Nutrition.

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