* The main food types, tests and sources are:
| Food type | Source | Test |
| Protein | Meat, fish, eggs | Biuret |
| Carbohydrates | Starch: bread,
pasta Sugar: sweets, cakes |
Iodine Benedicts |
| Fats | Oil, butter, cream | Brown paper |
| Vitamins | A: carrots C: citrus fruits |
None |
| Minerals | Iron: liver Calcium: milk, cheese |
None |
