system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What makes olive oil so healthy and sunflower oil unhealthy?
gpt
sunflower oil contains a lot of linoleic acid, a so called omega-6 fatty acid. our current nutrition generally lacks omega-3 fatty acids while containing plenty of omega-6 fatty acids. the balance of omega-3 to omeg-6 is considered important for health, so sunflower is often called unhealthy. 

olive oil contains substances that supposedly have health benefits, like antioxidants.