Overall Paper Difficulty & Structure
The May/June 2025 examination offers a very fair but comprehensive assessment of the CAIE 0648 syllabus. The difficulty sits comfortably at a moderate level (3 stars). Section A successfully probes core knowledge of macro- and micronutrients, notably demanding precise terms rather than vague descriptions. Section B is highly practical, focusing on culinary chemistry such as raising agents, cake faults, and deep frying. Section C provides two distinct pathways: a public-health-focused essay on obesity, and a specialized dietary analysis of a pregnant lacto-vegetarian. This balance allows both theory-focused and practically skilled students to demonstrate their depth of understanding.
Where the Marks Are Won or Lost
High-scoring candidates secured easy marks on straightforward recall questions in Section A, such as listing HBV protein sources and the functions of Calcium. However, significant marks were lost in the explanation of the sodium-potassium balance in relation to hypertension, where candidates often failed to outline the physiological mechanism of water retention and blood volume. In Section B, the step-by-step description of the melting method for gingerbread required precise technical terms (e.g., 'sieving', 'making a well', and 'dissolving fat and sugar without boiling'). Many lost marks by writing generalized baking instructions rather than the specific melting procedure.
Key Examiner Pitfalls & Misconceptions
- Vague Food Sources: When asked for sources of specific nutrients (like Vitamin B12 or Beta-carotene), writing broad categories such as 'meat' or 'vegetables' frequently scored zero. Candidates must name specific, high-yield sources like 'spinach', 'eggs', or 'quinoa'.
- Confusing Lactose Intolerance with Milk Allergy: A recurring issue in Q9(e) was candidates explaining lactose intolerance as an immune/protein reaction instead of an enzyme deficiency (lactase) leading to the inability to digest milk sugar (lactose).
- Section C Lack of Justification: Many essay responses on pregnancy diets listed appropriate foods but failed to link them to the specific physiological needs of the fetus (e.g., folate for neural tube development).
Exam Strategy & Preparation Tips
To maximize marks, candidates must prioritize active retrieval of nutrient functions, deficiency diseases, and food sources. When practicing Section B recipe methods, focus on memorizing the precise verbs and parameters (temperatures, equipment, and structural changes). For Section C, use a dual-column planning method during your reading time: list the nutrient/action on one side, and the direct physiological benefit to the target group on the other.