Increased nutrient demands among adolescent athletes are commonly associated with increased energy expenditure while their bodies develop and mature during puberty. Despite this, malnutrition is still rampant due to inadequate nutrient intake, poor nutrition awareness, negative perception, and improper dietary habits. This study aimed to assess the knowledge, attitude, and practices on food, nutrition, and sports nutrition among high school student-athletes of Camarines Sur National High School under the Special Program for Sports. Purposive sampling has been employed, and 31 respondents participated in the study using online survey forms. Half of the student-athletes had good knowledge scores (51.6%). Forty-eight percent of the respondents obtained a negative attitude toward nutrition, and more than half of the participants had a good level of practice (61.3%). Specifically, the sport departments that have garnered good knowledge scores are volleyball (22.6%), table tennis (9.7%), badminton (6.5%), taekwondo (3.2%), chess (3.2%), softball (3.2%), and basketball (3.2%). Meanwhile, the sport departments that have garnered good practice scores are volleyball (32.2%), table tennis (6.5%), badminton (6.5%), soccer (6.5%), softball (3.2%), chess (3.2%), and taekwondo (3.2%). One of the potential determinants of nutrition knowledge is the length of training which indicates the need to incorporate nutrition-related training in their sports program and academic curriculums. 32.2% of the participants with length of training of 2-3 hours/week and 19.4% observing 4-7 hours/week have obtained high knowledge scores. Only the knowledge score has been comparable with the length of training in the study. Ultimately, the findings of the study may indicate the necessity of further studies where random sampling will be used to generalize the association between the KAP domains.