Background: Regular consumption of antioxidant rich diet is associated with a myriad of health benefits. At present there are no consistent perspectives about plant-based antioxidant rich diet being associated with a change of serum antioxidants status/oxidative stress in Sri Lankan healthy adults. Objective: The present study aimed to assess the association between plant-based dietary antioxidant intake and the oxidative stress in a group of healthy adults (n=80) in Bope-Poddala health unit area, Galle, Sri Lanka. Method: The concentration of serum malondialdehyde (MDA) was estimated as a marker of lipid peroxidation and oxidative stress. The information on the plant based antioxidant rich food intake of the participants of the study were obtained using a pre tested food frequency questionnaire. Using the questionnaire, amount of each food consumed over a month was determined based on intake of individual food types. The consumption of vitamin E, vitamin C and carotene levels were calculated using food composition tables. The average daily intake of vitamin C, vitamin E and carotene content in selected food were considered in assessing dietary antioxidant intake. Results:The serum malondialdehyde concentration was in the range of 0.012-0.360 nmol/mg in the study sample. There was a weak, non-significant negative correlation (-0.156) between daily antioxidant intake and malondialdehyde concentration/lipid peroxidation (p=0.166). Conclusion:The results failed to reveal an association between plant-based dietary antioxidant intake and the oxidative stress in healthy adults in health unit area of Bope-Poddala, Sri Lanka.