- OEK 000: Belonging to the Subject; not further Classified
- OEK 001: General Aspects of Ecotrophology, Nutritional Science and Domestic Science
- OEK 100: Nutritional Science
- OEK 200: Alimentary DiseasesAllergic reactions to food see MED 490
- OEK 300: Nutrition for Specific Population Groups
- OEK 400: Nutritional Components Here: Nutritional Properties etc. of Specific Foods
- OEK 500: Different Models of NutritionNutrition under Various Climatic Conditions see GEO 055
- OEK 510: Nutrition During Disease; Dietetics (including Slimming Diets and Accompanying Measures)
- OEK 520: Vegetarianism; VeganismProduction of Meat Analogues see LEB 410
- OEK 530: Not-Science-Based Models of Nutrition; Outside Diets
- OEK 550: Community Catering; Food Service Sector
- OEK 510: Nutrition During Disease; Dietetics (including Slimming Diets and Accompanying Measures)
- OEK 700: Home Economics
- OEK 710: Housekeeping Technology and Engineering
- OEK 711: Technology of Food Preparation: Kitchen Machines; Baking Oven; Stove etc.
- OEK 712: Technology of Food Storage, Food Supplies: Refrigerator, Freezer etc.
- OEK 713: Technology of Textile Processing, Cleaning and Care (Washing Machines, Ironing Machines, ...)
- OEK 714: Technology of Cleaning (Vacuum Cleaner ...)
- OEK 711: Technology of Food Preparation: Kitchen Machines; Baking Oven; Stove etc.
- OEK 720: Housework; Ergonomics; Safety at Work
- OEK 730: Home Economics; Economics of Household
- OEK 740: Consumer Affairs; Consumption Studies; Consumer Behaviour
- OEK 750: Housekeeping Counselling; Consumer Counselling; Product Science
- OEK 760: Consumer Policy; Consumer Protection
- OEK 710: Housekeeping Technology and Engineering
- OEK 800: Restaurant and Hotel Industry
- OEK 999: Cookery Book