The ability to communicate in the English language is a core competence today. It is, therefore, also a competence which pupils should have acquired by the end of their school career. Content and Language Integrated Learning , the acronym is CLIL, is one possible means of acquiring this ability, not only through traditional language classes but also through the support of other subjects, especially the natural sciences. CLIL is often offered in primary schools but senior schools also advertise this means of learning at school and open house events. The usage of the foreign language within biology lessons leads to a support in the acquisition not only of the English language, but also in content and general learning abilities. The topic ?A Balanced Diet? has become an ubiquitous issue ever since the advent of television broadcasts with nutritionists such as Sasha Waleczek. The ideal of beauty, which has led to the growth of a fake image of beauty in our Western civilisation, plays its part in the popularity of the topic. It is one of the main duties of biology teachers to create a profound knowledge of a healthy nutrition and the contents of different nutrients and their effect on young people?s bodies. The combination of the topic of nutrition with CLIL can help us to achieve this goal. Within the work for this thesis materials for CLIL classes on the topic of a balanced diet have been developed and have been tested on their applicability in lower and upper schools. The collection of materials was distributed amongst the participating teachers, who could choose freely from the tasks. They and their pupils were then asked about the outcomes and their experience with the materials with the help of an evaluation sheet.