The discovery that faulty metabolism is at the root of many brain diseases suggests a surprising transplant could be the way to protect our brains from the ravages of ageingProtein plaques in the brain may be caused by failing mitochondriaSebastian Kaulitzki/AlamyIF YOU own a car, you will have noticed the engine getting less efficient with time. Worse, in a similar way to an old car leaving clouds of smoke in its wake, the cell’s powerhouses start generating unwanted waste products that slowly poison our brains. *Cancel anytime within 14 days of payment to receive a refund on unserved issues