Abstract: This paper researches the benefits of healthy eating and how it impacts human physical and mental health. Initially, the paper defines healthy eating and the research related to nutrition. The current definition of nutritious food includes whole unprocessed food packed with required macro and micronutrients indicating a highly nutritious quality. Processed food with minimal nutrients can deprive the human body of essential nutrients required for its healthy functioning. Evolutionary research indicates that humans have evolved in a manner that prefers a diet containing essential nutrition. Additionally, current research suggests that nutrition affects gene expression and DNA methylation. Hence, in conclusion, proper nutrition is beneficial for both the mental and physical health of humans.