Michael Mosley and the doctors are back. Giles Yeo tests the extraordinary claim that eating less can boost your memory. Alain Gregoire discovers our body's secret built-in stress-buster. Zoe Williams reveals how to spot a hidden illness that can cause stillbirth. Michael uncovers how a simple magnet can save the sight of people with glaucoma. And in a special report, Dr Javid Abdelmoneim investigates what's really in the cannabis-based health products you can buy over the counter.
