Michael Mosley discovers that enjoying more olive oil in your daily diet can come with a whole host of surprising benefits, including protecting your brain, improving your memory and reducing chronic inflammation. The Mediterranean diet has been shown to be one of the healthiest in the world, and a major component of this is olive oil. Dr Bill Mullen from the University of Glasgow tells Michael about his recent research, which found that two tablespoons of olive oil a day can significantly reduce biological markers of heart disease. Meanwhile our volunteer Ellen, an avid home cook, reaps the benefits of switching to olive oil.