This study investigated the knowledge of nutrients in food among teacher training course students. The subject of this research was 166 teacher training course students. They were required to prepare a meal and to classify the nutrients contained in each of its ingredients. Following this, the nutrients that had been classified were investigated to see whether they had been identified correctly. As a result of this, we were able to clarify the following points: 1. Teacher training course students use a variety of ingredients when cooking. 2. Students are aware of the nutrients contained in food based on what they have discovered in textbooks. 3. Understanding of the nutrients contained in food, without reference to a textbook, is poor. This is particularly so in the case of inorganic nutrients.