Healthful living has been a cornerstone of Seventh-day Adventist belief and practice almost from the very beginning of the church's history. The problem was that no one had studied the role healthful practices play in Seventh-day Adventist education using the entire Seventh-day Adventist student population. The correlations between four aspects of health and wellness identified as general health, diet, adequate sleep, and exercise and the variables of academic achievement and cognitive ability were investigated for the first time in a study involving the students from every Seventh-day Adventist school in the United States and Bermuda. The purpose of this study was to examine four aspects of health and wellness and their relationship to academic achievement and cognitive ability. Information regarding students' general health, diet, sleep, and exercise was collected by the "CognitiveGenesis" research study. This data was analyzed with the control variables of grade level, gender, family income, ethnicity, parental presence, and class size to determine whether or not there were interactions with 18 measures of academic achievement and four measures of cognitive ability. The study found that the healthier a student was, the higher his ITBS and CogAT test scores, that students generally earned higher test scores when eating a moderately healthy diet, and/or when receiving 8 hours of sleep a night, and that engaging in more than 5 hours of exercise a week after school had the effect of lowering achievement and ability scores. The interactions of the dependent and control variables on academic achievement and cognitive ability varied considerably. General health was found to have a strong effect on lower grade students, females, Black and White students, students from homes with much parental presence, and students in classes of 7-12 students. Diet showed a stronger effect on students in the upper grades, on Black and on White students, and on students from homes with significant amounts of parental presence than those with other characteristics. Sleep demonstrated a strong effect on lower grades students, males, students from homes with higher family income, White students and often Asian ones, those from homes with a strong parental presence, and students from small size classes. The effect of exercise was most prominent for 7 th grade students, males, students from homes with the highest family income level, those in classes of 2-3 for Reading Comprehension, and students from classes of 26 or more for Computation. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]