Nutritional Care in Amyotrophic Lateral Sclerosis (ALS)

Why Nutrition Matters in ALS

Muscle wasting, increased work of breathing, and dysphagia (difficulty swallowing) raise the bodys energy requirements while simultaneously reducing oral intake. Even a modest 510% loss of body weight is associated with faster functional decline and shorter survival.

Key reasons for proactive nutritional care include:

• Preserving lean body mass and respiratory muscle strength.
• Reducing fatigue and enhancing ability to participate in therapy.
• Preventing complications such as aspiration pneumonia.
• Supporting immune function and overall wellbeing.

Assessment

Baseline Evaluation

At diagnosis, every patient should receive a comprehensive nutritional assessment by a dietitian experienced with neuromuscular disease. The assessment typically includes:

• Weight, height, and body mass index (BMI).
• Recent weight trend (percentage change over 36months).
• Caloric intake diary (3day food record).
• Swallowing evaluation (clinical bedside screening; videofluoroscopic swallow study if needed).
• Respiratory function (forced vital capacity, FVC).
• Laboratory markers (albumin, prealbumin) when appropriate.

Ongoing Monitoring

Weight and intake should be checked at each clinic visit (typically every 13months). More frequent monitoring is advisable when rapid weight loss is detected or when a feeding tube is being considered.

Caloric and Protein Requirements

Energy needs rise as disease progresses. General recommendations are:

• Caloric intake: 3035kcal/kg body weight per day for men; 2530kcal/kg for women. Adjust upward if weight loss exceeds 5% in a month.
• Protein: 1.21.5g/kg body weight per day. Protein supports muscle maintenance and respiratory effort.

Tip: Use a caloriedense diet (e.g., adding powdered milk, nut butters, or oils) rather than large volumes, especially when swallowing is impaired.

Dietary Strategies

1. Optimize Oral Intake

• Offer small, frequent meals (56 times daily) rather than three large meals.
• Serve soft, easytochew foods: pureed vegetables, scrambled eggs, yogurt, smoothies.
• Enhance flavor with herbs and mild spices to stimulate appetite.
• Avoid dry or crusty foods that increase choking risk (e.g., crackers, toast).

2. NutrientRich Supplements

Highcalorie oral supplements can bridge gaps. Choose products that provide at least 300400kcal and 1520g protein per serving. Examples include specialized liquid nutrition drinks, maltodextrin powders, or homemade smoothies with fruit, milk, nut butter, and protein powder.

3. Hydration

Dehydration worsens swallowing and thickens secretions. Encourage regular fluid intake, aiming for 1.52L per day unless contraindicated by cardiac or renal disease.

4. Fatty Acid Balance

Omega3 fatty acids may have antiinflammatory benefits. Include sources such as salmon, flaxseed oil, or walnuts a few times weekly.

Management of Dysphagia

When swallowing becomes unsafe, a stepwise approach is recommended:

1. SpeechLanguage Pathology (SLP) assessment: Determines safe textures and techniques.
2. Texture modification: Transition from regular to soft, then pureed diets as needed.
3. Swallowing maneuvers: Chintuck, effortful swallow, or headturn techniques may improve safety.
4. Enteral feeding: If oral intake falls below 60% of estimated needs or aspiration risk is high, insert a feeding tube.

Feeding Tube Options

• Nasogastric (NG) tube: Shortterm solution (<46weeks) for acute weight loss.
• Percutaneous endoscopic gastrostomy (PEG) or radiologically placed gastrostomy (RIG): Preferred for longterm nutrition; usually placed before FVC falls below 50%.

Placement should be discussed early, as postoperative respiratory complications increase when FVC is low.

Special Situations

Respiratory Decline

When FVC drops below 50%, caloric density becomes crucial because the work of breathing consumes a larger share of calories. Prefer thickened, highfat liquids and consider nighttime feeding via a pump.

Gastrointestinal Issues

Constipation is common due to reduced mobility and medication side effects. Increase fiber (fruits, vegetables, whole grains) and fluid intake; consider a gentle laxative if needed.

Weight Management in Overweight Patients

Even individuals with a higher BMI can benefit from a modest caloric increase if weight loss begins. The goal is to maintain stable weight rather than achieve weight loss.

Multidisciplinary Collaboration

Effective nutritional care depends on coordinated teamwork:

• Neurologist: Oversees disease progression and initiates referrals.
• Dietitian: Designs individualized meal plans, monitors intake, and adjusts prescriptions.
• SpeechLanguage Pathologist: Evaluates swallowing and trains safe eating strategies.
• Respiratory therapist: Assesses respiratory function and advises on timing of tube placement.
• Social worker / caregiver: Supports implementation of nutrition plans at home.

Key TakeHome Messages

• Maintain body weight; a loss of >5% signals the need for intensified nutritional intervention.
• Target 3035kcal/kg and 1.21.5g protein/kg daily, adjusting upward as the disease advances.
• Use caloriedense foods and oral supplements to meet goals without excessive meal volume.
• Address dysphagia early; consider PEG placement before respiratory function declines.
• Regularly review nutrition status every 13months with a specialist dietitian.

Further Reading & Resources

• National Institute of Neurological Disorders and Stroke ALS
• Muscular Dystrophy Association Nutrition for ALS
• ALS Association Clinical Nutrition Guidelines