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Level 3 Moderately Thick
Prep: 30 min Difficulty: Easy Main ingredient: chicken
#level-3#soup#protein-fortified#whey-protein#soy-protein#medical-nutrition#sarcopenia#cantonese#liquidised#smooth

Protein-Fortified Soup | IDDSI Level 3 Recipe

IDDSI Level 3 (Liquidised) | 30 minutes | Easy | Medical Nutrition — 20g protein per serving

Sarcopenia — the progressive loss of muscle mass, strength and function associated with ageing — affects an estimated 20–50% of people over 80, rising to over 60% in frail care home populations. Adequate dietary protein is the primary modifiable nutritional intervention for sarcopenia prevention and treatment. Current guidelines recommend 1.0–1.2g protein per kilogram of body weight per day for healthy elderly adults, rising to 1.2–1.5g/kg/day for those with illness or injury. A 60kg resident thus requires 72–90g protein daily — a target that is frequently not reached by residents on texture-modified diets. This protein-fortified soup protocol is designed to be applied to any standard Cantonese-style clear soup that is already part of the care home’s meal rotation. Adding unflavoured protein powder to a warm (not hot) soup provides 20g of high-quality, rapidly absorbed protein with minimal impact on flavour and no change to the Level 3 texture. It is the simplest and most scalable protein fortification intervention available.

Ingredients (1 serving — approximately 250ml)

Cantonese-style clear soup base (choose one):

Protein fortification (per serving):

Standard soup recipe guidance (chicken and vegetable base):

Method

Standard soup base:

  1. Combine chicken, carrot, celery, ginger and water in a pot. Bring to a boil, skim any foam from the surface, then reduce to a low simmer. Cook for 25–30 minutes until the chicken is completely tender and the vegetables are soft.
  2. Strain the soup through a fine-mesh sieve to remove all solids — only the smooth, clear liquid remains. Taste and adjust seasoning. Reserve the strained chicken and vegetables for use in other dishes if desired.
  3. Level 3 consistency check: The clear soup should flow freely. If the soup has reduced to a Level 4 consistency (e.g., if gelatin has been released from bones), thin with additional hot water.

Protein fortification (at time of serving): 4. Allow the soup to cool slightly to approximately 60–70°C — it should be warm but not scalding. Protein powder can become denatured and form lumps if added to water above 80°C. 5. In a small cup, combine the protein powder scoop with 2 tablespoons of the warm soup. Stir vigorously with a small spoon or mini whisk for 30–60 seconds until completely dissolved — the mixture should be smooth and lump-free. 6. Pour this protein mixture back into the main serving of warm soup. Stir well. 7. Consistency check after fortification: The fortified soup should still flow freely from a tilted spoon. If the protein powder has caused thickening above Level 3, stir in 1–2 tablespoons of hot soup or water to restore flow. 8. Serve immediately.

Texture Test

Flow test: Passes Level 3 — flows freely and continuously from a tilted spoon; settles flat within 5 seconds; the protein-fortified soup should behave identically to the unfortified soup in terms of flow.

Visual check: No visible protein powder lumps or undissolved particles. The soup may appear very slightly cloudier after fortification — this is normal and does not indicate a texture problem.

Safety Notes

⚠️ Temperature for protein addition — add protein powder only when soup temperature is 60–80°C. Above 80°C, whey protein denatures and forms rubbery clumps that are not appropriate for Level 3. If unsure of temperature, allow the soup to cool for 3–5 minutes before adding protein powder.

⚠️ Pre-dissolve is mandatory — adding protein powder directly to a full bowl of soup without pre-mixing results in clumps. Always pre-dissolve in a small amount of the same soup first.

⚠️ Soup base must be strained smooth — the protocol only works if the soup base is already smooth and free of particulate pieces. Do not add protein powder to unstrained soup with soft vegetable chunks — strain first.

⚠️ Allergen check — whey protein is dairy-derived. For residents with lactose intolerance or dairy allergy, use soy protein isolate or pea protein powder.

⚠️ Palatability monitoring — unflavoured protein powder is generally neutral in taste, but some brands have a slight chalky or dairy note. Conduct a palatability check before introducing to the full resident group; if residents detect an off-flavour, try a different brand.

Sourcing Outside Hong Kong

For international care kitchens and home cooks outside Hong Kong, Cantonese ingredients are widely available at East and Southeast Asian grocery stores:

Fresh chicken (whole or boneless): available at Asian butchers; Wing Yip and H Mart stock Cantonese-preferred free-range varieties.

If a specific ingredient is unavailable in your region, the recipe notes alternative substitutions in the Ingredients section. For dishes requiring fresh Cantonese-specific ingredients (e.g. preserved century egg, fresh rice noodle rolls), check with your local East Asian grocer before substituting — texture compliance for IDDSI levels may require specific products.

Nutrition

Per serving after fortification (approximately 250ml soup + 20g protein powder):

This represents a complete high-quality protein hit in a single soup serving. For a 60kg resident requiring 80g protein daily, three protein-fortified soup servings across meals would contribute 60–66g protein — most of the daily target without requiring dietary supplements or significantly increasing food volume. Whey protein is among the highest-quality proteins available, with a complete essential amino acid profile and a high leucine content, which is specifically important for muscle protein synthesis stimulation in the elderly (leucine threshold effect).

Clinical Context

This fortification protocol is based on evidence-based nutrition recommendations for preventing and treating sarcopenia in older adults. The goal is to bring residents on IDDSI Level 3 diets closer to the 1.0–1.5g/kg/day protein target using a food-first approach before escalating to clinical supplement prescription. It is suitable for kitchen-level implementation without requiring individual dietitian prescription, though care homes should involve a dietitian in designing the overall protein intake strategy for their resident population.

Variation

⚠️ This recipe is for reference only. Texture varies by technique and ingredients. A speech therapist should confirm the appropriate IDDSI level.
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