'Essential mineral' may age brain by '19 or more years' among people eating high-fat diet

The research suggested that an imbalance in the metals may drive the development of brain plaque.

In their report, the authors cited an animal study which “found that the consumption of copper in drinking water could amplify the degenerative effects of a high-fat diet on rabbit brains”.

They added: “Organ meats, such as liver, and shellfish as the foods highest in copper levels.”

Other copper-rich foods include nuts, seeds, legumes, whole grains, potatoes, chocolate and some fruits.