The digestive tract is a hugely complex arrangement of organs working together in harmony to give your body all the benefits it needs from the food we eat and to protect us from harmful bugs and bacteria. By looking at a typical American family we are able to see how lifestyle, fast foods and work dictate what we eat, how we eat and therefore how well our digestive system works. Eddie the Enzyme pops up with step by step advice, on the do's and don'ts of good digestion. With him and the help of an expert nutritionist we explain precisely what food makes for good digestion.

At 0.58 GMT on 26th December 2004, the Eurasian and Australia tectonic plates clashed together. The resulting earthquake - the biggest for 40 years - triggered a powerful tsunami. This giant wave carved a path of destruction across the Indian Ocean. Entire towns were swept away, popular holiday destinations were completely destroyed, more than 300,000 people were killed and millions were left indesperate need of food and shelter.

With the mix of ever available food and labour saving technology, obesity is quickly spreading across the globe. Examine the science of fat with scientists whose experiments show that the body has a set weight that it strives to maintain. Listen to personal stories of people fighting obesity and the genetic breakthrough that could lead to the first anti-fat drug.