Scientists have created an eating plan made up of four leading diets to help people maintain their brain health in old age.

According to researchers from around the world, 'what's good for the heart is good for the brain'.  

They also add that no single food acts as a 'silver bullet' for improving or maintaining cognitive wellbeing.

People should eat a combination of different produce to maintain their brain health, they add.

The four-part hybrid diet includes the Mediterranean way of eating, which focuses on extra-virgin olive oil, vegetables and fish; with the DASH diet, which emphasises low salt and limited portion sizes.

On top of this, the Nordic diet, which is similar to the Mediterranean way of eating but uses rapeseed oil over olive, should be combined with the Okinawan diet, which is followed by indigenous populations in Japan and focuses on soy and legumes.

Below outlines what foods to eat plenty of, which to be sure to include in your diet and those that are just for a treat, as well as lifestyle tips, to preserve your brain health.