but some of the biggest sponsors of the games are coca-cola, cadbury, mcdonald's, and heineken.y in the medical profession fear that the world is now in an obesity crisis. in the developed world, that crisis is linked with sugary, processed foods. and logos will be at the games. in britain, the national health service, the nhs, is that the front line of this crisis. for one doctor's personal assessment of the dangers, we turn to the nhs cardiologists. >> over the last 30 years, processed food has taken over the british a diet. over the past 30 years, obesity has more than doubled. now, as london prepares to host a global sporting celebration, processed food has taken over the olympics. >> it is a scandal that the food and drink industry are high profile sponsors of the olympic games. the olympics is supposed to be about fitness and health, and to associate them with products which are damaging our health, particularly our children's health, is quite wrong. >> the human heart is a thing of simplicity and wonder. it is designed tpump blood around your body at 60 beats per minute f