While the world is focusing on global hunger and malnutrition, another ugly “monster” has emerged – OBESITY, a new form of malnutrition, has surfaced as an urgent challenge affecting several countries. The issue of obesity has received a great deal of attention over the past few decades. Rising obesity rates are a major concern worldwide. The study aims to determine the effect of weight management in the prevention of chronic illnesses acquired from obesity of laboratory high school students. The study made use of purposive sampling of One Hundred laboratory high school students using questionnaire is the main instrument in data gathering. It is noted that the students practice healthy lifestyles and preventions to health problems. The respondents should be into physical activities and embrace properly balanced diet since it shows that these have a relationship in the prevention of health problems.