Many people are unaware how much caffeine they consume every day and could easily be breaching the 'safe limit', experts have said, thanks to products that contain hidden amounts. According to the NHS and Food Standards Agency, 400mg of caffeine a day is 'unlikely to cause adverse effects' - with pregnant women told to stick to half that amount. But one large coffee from a High Street chain could contain as much as 370mg of caffeine alone. According to new research by Northerner, nearly two-