Food Service and Nutrition Management: Systems, Menu Planning, Cost and Quality
Food service items test the operational side of dietetics: which production system suits which institution, how a menu is planned and checked, how purchase and edible-portion yields determine cost, and how safety and quality are verified on the tray line.
Production systems
Conventional (cook-serve) prepares and serves on site, giving the best eating quality but high labour and equipment demand. Commissary systems cook centrally and distribute chilled or frozen to satellite units. Cook-chill and cook-freeze (ready-prepared) extend shelf life and allow batch purchasing but require strict blast-chilling and regeneration control. Assembly-serve merely heats pre-prepared items, minimising skilled labour at the cost of flexibility and eating quality.
Menu planning
The menu must be nutritionally adequate against DRIs and the Food Pagoda, varied, seasonally appropriate, deliverable with available equipment and staff skill, and costed within budget. Plan a cycle menu (for example, 7 days) then check it against reference intakes and the food-exchange lists before implementation. Therapeutic modifications - energy-restricted, low-salt, low-protein, diabetic, texture-modified - are layered onto the base menu rather than replacing it, so that one production line serves all diets.
Cost, procurement and yields
- Food cost percentage = food cost / food revenue x 100; institutional targets are commonly 25-35%.
- Inventory turnover = cost of goods used / average inventory value.
- Purchase specifications must state grade, pack size, and edible portion (EP) yield, because purchasing uses as-purchased (AP) weight.
Quality and safety management
Apply HACCP in the kitchen: cooking and regeneration temperatures as CCPs, blast chilling to 0-3 C within 90 minutes, hot holding above 60 C, documented thermometer calibration, allergen control, tray accuracy audits and patient satisfaction or plate-waste measurement.
Worked example
A menu needs 500 portions of carrot at 100 g edible portion each: 50 kg EP. If the yield is 75%, AP = 50 / 0.75 = 66.7 kg. At 8 yuan per kg the batch costs 533 yuan, or about 1.07 yuan per portion. If the department's food revenue for that meal is 4000 yuan and total raw food cost 1200 yuan, food cost percentage = 30%, within the usual target band - but if waste pushes AP to 80 kg, cost rises to 640 yuan and the percentage to 32%, still acceptable only if revenue holds.
Traps that cost marks
Confusing AP with EP, which reverses the multiplication and division. Putting revenue in the numerator of the food cost percentage. Checking a menu for energy only while ignoring texture modification and allergens. Assuming cook-chill products are shelf-stable without temperature control. Treating HACCP as a paperwork exercise rather than monitoring at defined CCPs.