Ultra-processed Food Consumption and Health Pilot Study

The objective of this study is to explore the effects of two dietary conditions (UPF-diet and typical American diet) on a number of clinical and metabolic outcomes in order to derive sample size estimates for a larger trial and to determine the feasibility of the study approach. This study is an out-patient cross-over trial comparing the Nutrition for Precision Health (NPH) purple diet (American Diet) and a diet high in ultra-processed foods (UPF diet) for two weeks in which participants will be randomized to the order of the diets. Specific Aim 1: Determine the feasibility of recruiting, enrolling and assessing participants in a randomized trial comparing a UPF diet with the standard American diet. Feasibility will be assessed by the achievement of study goals (i.e., sample size; completeness of study data). Specific Aim 2: Derive sample size estimates for future trials based on the mean effects and associated variances obtained in the pilot study.