# Nutrition and diets in spinal muscular atrophy
Nutrition plays a special role in spinal muscular atrophy (SMA). On one hand because muscle breakdown requires energy and malnutrition can accelerate it, on the other hand because swallowing difficulties and weakening of muscles in the mouth and throat make nutrition more difficult. With modern treatments, nutritional needs and possibilities also change. Below is what research and clinical experience have shown so far about various nutritional approaches.
Adequate protein intake
ResearchediPositive results in clinical studies, not yet standard treatment
This concerns nutrition that contains sufficient protein — usually through meat, fish, eggs, dairy, legumes or plant-based protein sources. The idea is that muscles need protein to break down or strengthen.
Recent research into nutritional outcomes in children with SMA type 1 and 2 under treatment shows that children treated with disease-modifying therapies (such as nusinersen or gene therapies) follow different growth patterns than untreated children. This suggests that nutritional needs change as muscles function better or grow differently through treatment. A 2026 study mapping growth in SMA children used specific growth curves and found that nutrition plays a role in achieving a healthy body weight.
Malnutrition can accelerate the breakdown of existing muscle mass. For this reason, many treatment centres or dietitians follow care around adequate protein intake — but what 'sufficient' exactly is depends heavily on age, current muscle strength and whether someone is receiving treatment.
**Risks:** Too much protein does not have to be harmful, but can also cause oesophageal or stomach problems in some SMA patients. Collaboration with a dietitian is important here.
Nutrition for swallowing ability and ease of swallowing
ResearchediPositive results in clinical studies, not yet standard treatment
This concerns the form and composition of food so that swallowing (especially for people with weakened mouth, tongue and throat muscles) is safer and easier. This can include: food with adapted texture (porridge, puree, moisteners), smaller bites, or adjustments to temperature and taste.
SMA can affect the lip and tongue muscles. A study of four treatment centres in 2026 showed that symptomatic SMA type 1 patients have weak lips and tongue — which makes swallowing, chewing and eating difficult. A recent systematic review (2026) collected studies on swallowing and nutrition after disease-modifying therapy and found that many treated children can swallow better, but some continue to need help.
Another study from 2026 on swallowing in SMA type 1 showed that some children who were treated before symptoms (pre-symptomatically) learn to eat and drink better than children treated later. This suggests that early intervention on swallowing ability can help.
**Risks:** Swallowing difficulties increase the risk of food in the airway (aspiration) and pneumonia. Adaptation of food consistency should be part of speech therapy or nutritional expert assessment.
Nutrition with extra calories and fats
ResearchediPositive results in clinical studies, not yet standard treatment
This concerns nutrition enriched with oil, butter, cream or calorie-dense foods — to quickly provide more energy in less volume. Useful when someone can eat little due to weakness or swallowing difficulties.
Studies on growth in SMA show that some children struggle to maintain their weight. Extra calories can help. In cohort studies of treated children, good nutrition (including calorie-rich nutrition) was associated with better growth and less malnutrition.
**Risks:** Too much saturated fat can cause stomach problems in some. Medicines for acidity or bowel movement can change absorption.
Antioxidants and ergothioneine
ExperimentaliOngoing in study setting, outcome still unknown
This concerns food or supplements with substances that could inhibit harmful processes in cells — for example ergothioneine, a natural substance in mushrooms, grains and some vegetables.
A recent animal study (2025) showed that ergothioneine supplementation in mice with an SMA-like condition provided better survival and physical appearance. This is promising, but has not yet been studied in humans.
**Risks:** No known risks in normal amounts, but this research field is young and controlled human studies are lacking.
Fasting patterns (periodic fasting, intermittent fasting)
UnproveniNo scientific evidence that it works
This concerns patterns in which periods without food alternate with periods of food consumption — for example eating during certain hours and not eating during other hours, or fasting on certain days.
For SMA, no targeted research on fasting patterns is known. Since SMA is accompanied by muscle wasting and malnutrition is a risk, caution should be exercised. For many SMA patients, regular, distributed meals may be better than long periods without food.
**Risks:** Fasting can accelerate muscle wasting and worsen malnutrition, especially in severe SMA.
Ketogenic diet (low-carbohydrate, high-fat)
UnproveniNo scientific evidence that it works
This concerns nutrition with few carbohydrates, much fat and moderate protein — whereby the body relies more on fat burning.
For SMA, no targeted research on ketogenic diets is known. There are no reasons to indicate why it would help in SMA.
**Risks:** Weight loss, disrupted nutrient intake, and especially for children: potential growth delay. Not recommended without a strong medical reason and strict supervision.
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Nutritional choices in SMA are tailored to the individual. They depend on age, type and severity of SMA, type and stage of treatment, and whether someone has swallowing and eating problems. Changes in body weight, energy, or muscle wasting require reassessment. This should take place in good consultation with the treatment team, and in many cases supported by a dietitian with knowledge of SMA and nutritional problems.
_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._