Dubbed the "world capital of olive oil," it's the biggest producer of olive oil in the world. Picual olives have high levels of polyphenols, which are what make olive oil high in antioxidants ...

If I'm using it right away, I'll sometimes add an ice cube or crushed ice to the blender to ensure it is served well chilled but this does thin the mayo slightly. Choose high-quality olive oil.

We asked Ro Huntriss, dietitian and fertility expert (@dietitianro), to guide us in getting our hands on the best healthy olive oil around ... ve found the best high-quality yet totally ...