One of the biggest challenges Darren O’Reilly faces is convincing people to radically disrupt their eating habits and consume a powder rather than a sandwich.  A Dublin-bred entrepreneur, O’Reilly started out as a professional rugby player athletically coddled with breakfast, lunch, and a daily snack. After a stint playing in London for Harlequins, O’Reilly faced a shock and 20 kilograms of weight loss when he left elite sport and transitioned to corporate London life.  The idea for Whole Supp, the plant-based meal replacement powder, came from his own experience of being time-poor and chasing nutritional convenience.  O’Reilly linked up with…