The mineral Selenium is important for immune responses, the brain, hormonal health and cancer prevention. Recommended daily intake: 75 mcg men, 60 mcg women (over 450 mcg/day is toxic). The average consumption in the UK is only 30-35 mcg.

Sources of selenium: brazil nuts (no more than 2-3 per day due to high barium content), sardines, prawns, eggs, wholemeal flour, lean red meat.