Malnutrition Screening in Dysphagia: Tools, Risk Factors, and Clinical Management

Dysphagia and malnutrition are closely linked. The mechanical and sensory challenges of a modified-texture diet — reduced palatability, altered appearance, smaller permitted portion sizes, effort required to eat — collectively suppress intake. Simultaneously, the underlying conditions that cause dysphagia (stroke, cancer, neurological disease, frailty) frequently also impair appetite, increase metabolic demand, or both. The result is that malnutrition is substantially more prevalent among people with dysphagia than in the general population.

This article covers the evidence, validated screening tools, clinical interpretation, and management responses for malnutrition risk in dysphagia populations.

Prevalence and Clinical Significance

Estimates of malnutrition prevalence among hospitalised patients with dysphagia range from 20–50%, depending on diagnostic criteria and patient population. In care home residents with dysphagia, prevalence may exceed 30% even before the new admission’s condition has fully developed.

The clinical consequences of malnutrition in a person with dysphagia are particularly severe:

• Reduced muscle mass (sarcopenia) worsens swallowing function — the muscles of the tongue, pharynx, and larynx are affected like any skeletal muscle. Malnutrition-induced sarcopenia can create or worsen dysphagia in a self-reinforcing cycle.
• Impaired immunity increases susceptibility to aspiration pneumonia.
• Poor wound healing is relevant for post-operative dysphagia patients.
• Cognitive changes from nutritional deficiency reduce the patient’s ability to apply compensatory swallowing strategies.
• Increased mortality: Malnutrition is independently associated with increased 30-day and 1-year mortality in hospitalised older adults.

Karen Chan and colleagues at the HKU Swallowing Research Laboratory have published work demonstrating that nutritional status is a significant determinant of dysphagia rehabilitation outcomes, reinforcing that nutrition management must be integrated with swallowing management rather than addressed separately.

Validated Screening Tools

MUST (Malnutrition Universal Screening Tool)

The MUST was developed by the British Association for Parenteral and Enteral Nutrition (BAPEN) and is recommended for use in all hospital and community settings by NICE guideline CG32 (Nutrition Support in Adults) and its successor guidance.

MUST comprises three components:

1. BMI score:

   • BMI > 20: Score 0
   • BMI 18.5–20: Score 1
   • BMI < 18.5: Score 2

2. Unplanned weight loss score:

   • < 5% in past 3–6 months: Score 0
   • 5–10%: Score 1

   • 10%: Score 2

3. Acute disease effect score:

   • Currently ill AND likely to have no nutritional intake for > 5 days: Score 2
   • Otherwise: Score 0

Total score interpretation:

• 0: Low risk. Routine clinical care.
• 1: Medium risk. Observe; document dietary intake for 3 days; repeat screening weekly (hospital) or monthly (care home).
• ≥ 2: High risk. Refer to dietitian; implement nutritional support plan; repeat screening weekly.

MNA-SF (Mini Nutritional Assessment Short Form)

The MNA-SF is specifically validated for use in older adults (≥65 years) and is widely used in Hong Kong care settings, geriatric wards, and residential aged-care facilities.

MNA-SF items:

• Food intake decline in past 3 months (due to appetite loss, digestive problems, or chewing/swallowing difficulties): 0–2 points
• Weight loss in past 3 months: 0–3 points
• Mobility: 0–2 points
• Psychological stress or acute disease in past 3 months: 0–1 point
• Neuropsychological problems (dementia or depression): 0–2 points
• BMI or Calf Circumference (if BMI not obtainable): 0–3 points

Total (0–14):

• ≥12: Normal nutritional status.
• 8–11: At risk of malnutrition.
• 0–7: Malnutrition.

The MNA-SF is preferable for older adults and aligns well with dysphagia populations, as it includes a specific question about swallowing difficulties affecting food intake.

Key Risk Factors in Dysphagia Populations

Beyond the screening scores, clinicians and caregivers should monitor for specific malnutrition risk factors common in dysphagia:

Clinical Response to Screening Findings

Dietitian referral

Any MUST score ≥ 2 or MNA-SF score ≤ 7 warrants urgent dietitian referral. The dietitian will:

• Calculate precise energy and protein requirements based on weight, condition, and clinical trajectory.
• Recommend specific fortification approaches (energy-dense modifications to prepared food).
• Consider whether oral nutritional supplements (ONS) are appropriate and, if so, which formulation (standard, high protein, IDDSI-appropriate consistency).
• Determine whether enteral nutrition is needed, and if so, the route and delivery schedule.

Weight monitoring frequency

• Acute hospital: Weekly.
• Care home: Monthly (minimum); weekly if MUST score ≥ 1 or on a nutritional support plan.
• Community: As directed by the GP or dietitian; minimum every 3 months for stable high-risk patients.

Caregiver-level responses to poor intake

When formal dietitian review is pending, caregivers can implement:

• Smaller, more frequent meals (5–6 per day instead of 3).
• Energy fortification of all meals: add butter, cream, cheese, oil, or egg yolk to savoury foods; condensed milk or cream to sweet foods. These additions are not visible in appearance but increase caloric density substantially.
• Prioritise the most tolerated foods — identify which foods the person consistently eats well and ensure these are offered at every meal.

For specific fortification strategies, see our article on nutrition fortification in texture-modified diets.

Documentation Standards

Malnutrition screening results, weight measurements, and nutritional support plans must be documented in the care record. In Hong Kong hospital and care home settings, this follows Hospital Authority standards and the relevant professional regulatory guidance. Key documentation elements:

• Date of screening and tool used.
• Score and risk category.
• Weight and BMI (or calf circumference if BMI unavailable).
• Action taken (routine monitoring, dietitian referral, nutritional support initiated).
• Date and result of next screening.

Key Takeaways

• Malnutrition is common in dysphagia — actively screen rather than assuming intake is adequate.
• Use MUST (for all adults) or MNA-SF (preferred for older adults) as the validated screening tool.
• MUST ≥ 2 or MNA-SF ≤ 7: urgent dietitian referral.
• Monitor weight monthly in care settings; weekly in acute hospital.
• Caregiver-level responses: smaller more frequent meals, energy fortification, prioritise tolerated foods.

References

1. Cichero JAY et al. (2017). Development of International Terminology and Definitions for Texture-Modified Foods and Thickened Fluids Used in Dysphagia Management. Dysphagia. PMID 26315994
2. IDDSI (2019). Complete IDDSI Framework. https://www.iddsi.org/framework
3. American Speech-Language-Hearing Association. Adult Dysphagia. https://www.asha.org/practice-portal/clinical-topics/adult-dysphagia/
4. NICE (2013, updated 2017). Intravenous fluid therapy in adults in hospital (CG162). https://www.nice.org.uk/guidance/cg162