Reactive oxygen species are constantly produced in our body due to various factors like environmental pollution, unhealthy diet habits, cellular metabolism etc. Epidemiological studies suggest that the intakes of antioxidants are inversely related to the cancer risk. While the cell culture studies confirm the effect of antioxidants against cancer, the clinical trials remains inconclusive. The human population is heterogeneous regarding Reactive oxygen species (ROS), so screening the human population for developing the risk of cancer will provide a scientific ground for the application of antioxidants. Research is increasingly showing that those who eat antioxidant-rich foods reap health benefits. Foods, rather than supplements, may boost antioxidant levels because foods contain an unmatchable array of antioxidant substances.