Background: "Choose Health: Food, Fun, and Fitness" (CHFFF) is aimed at 3rd to 6th graders, and uses experiential learning, food preparation, active games, goal setting, and a family newsletter to target behaviors shown to decrease childhood obesity and chronic disease risk. This study aimed to evaluate CHFFF as intended in low-income settings. Methods: A quasi-experimental design with delayed intervention was used. CHFFF participants in 27 after-school and 28 in-school groups in 5 New York counties in 2014 to 2015 completed a self-report survey at initial enrollment, after a no-intervention control period, and after receiving CHFFF. Statistical analyses were based on 561 3rd to 6th graders who completed all 3 surveys and participated in at least 4 of the 6 lessons. Results: Compared to their control period, after receiving CHFFF, youth significantly improved in the following multi-item dietary scores--overall dietary intake (p < 0.001), vegetable intake (p < 0.001), fruit intake (p < 0.01), soda/fast food intake (p < 0.05) and intent to consume soda/fast food (p < 0.001). Youth also reported reading Nutrition Facts labels and sharing about healthy eating with their family more often (both p < 0.001), and greater likelihood of having tried a new food (p < 0.001). Conclusions: Results provide evidence for the effectiveness of this curriculum in improving self-reported child diet and related behaviors.