Dieter's concerns include carbohydrates and fats. Carbohydrates are a type of macronutrient found in many foods, such as grains, fruits, and vegetables. They provide energy for the body and are an important part of a balanced diet. Fats are another type of macronutrient that are essential for the body to function properly. They provide energy and help the body absorb certain vitamins and minerals. Both carbohydrates and fats are important components of a healthy diet, and Dieter is likely concerned with making sure he is getting enough of both.