Sugar is the new controlled substance. More addictive than cocaine, the deadly white stuff has become the focus of health professionals worldwide who are highlighting the dangers of over-indulgence. And whilst we all know that a diet high in sugar can cause obesity, heart disease, cancer and diabetes, it is now also linked to a wide range of other serious health conditions, such as poor brain development in children, cataracts - even Alzheimer's. Quite simply, our excess intake of sugar, from the spoonfuls we tip into our tea to the high levels of fructose hidden in packaged foods, is making...