# Nutrition in Lewy body dementia
Malnutrition and weight loss
Malnutrition occurs more frequently in Lewy body dementia than in other forms of dementia. This is linked to symptoms such as swallowing difficulties, reduced taste and smell, apathy (lack of initiative), and eating problems due to motor disorders.
ProveniIncluded in official guidelines, or approved by EMA or FDA
Malnutrition is a recognized clinical problem and is associated with faster decline and more infections. This makes regular weight monitoring and nutritional assessment part of standard care.
If weight loss occurs, it is important to discuss this with your healthcare provider or dietitian. They can determine the underlying cause — for example, swallowing difficulties, reduced appetite, or side effects of medications — and focus targeted attention on it.
Polyunsaturated fatty acids
Recent studies examine the relationship between certain nutrients and the course of Lewy body dementia. Polyunsaturated fatty acids (omega-3 and omega-6) play a role in nerve function and inflammatory processes.
ResearchediPositive results in clinical studies, not yet standard treatment
Researchers have found that certain patterns of polyunsaturated fatty acids are related differently to Lewy body dementia than to Alzheimer's. This does not mean there is one 'good' dietary pattern, but rather that the body processes these substances in a specific way.
For practical nutritional choices — such as how much fish, nuts, or oil — it's best to discuss this with your dietitian. They can assess your situation personally.
Inflammation and plant compounds
Lewy body dementia is accompanied by chronic inflammatory processes in the brain. Some plant-based substances have anti-inflammatory properties, and research groups are looking at whether these might play a role.
ExperimentaliOngoing in study setting, outcome still unknown
Plant-based bioactive compounds (from vegetables, fruit, herbs, and tea) show promise in laboratory research, but clinical evidence in Lewy body dementia is still lacking. These are not substitutes for treatment.
Eating plenty of vegetables, fruit, and unprocessed products is generally healthy, but you don't need to try any special 'dementia diet' for this.
Eating difficulties and adapted nutrition
Lewy body dementia can cause serious swallowing difficulties (dysphagia), with risk of choking. Tremor, stiffness, and apathy can also make eating difficult.
ProveniIncluded in official guidelines, or approved by EMA or FDA
When eating becomes difficult, food and drink are sometimes adapted in texture or consistency. This may include: mincing food, thickening fluids, or tube feeding if chewing and swallowing become too risky.
These decisions are always personal and are made with speech therapy, dietetics, and geriatrics, never on your own.
Medications and food interactions
In Lewy body dementia, caution with certain medications is crucial. Antipsychotics can cause serious side effects, and many other medications have food interactions.
ProveniIncluded in official guidelines, or approved by EMA or FDA
Certain medications work differently on an empty stomach or together with certain food groups. This applies to antidepressants, anti-Parkinson's medications, and stomach medications. Alcohol can be dangerous when taken with many dementia-related medications.
Always check with your pharmacy or doctor: should the medication be taken with or without food, and are there foods you should avoid?
Hunger and satiety signals
Due to the development of apathy and lack of initiative, people with Lewy body dementia sometimes eat insufficiently. The body no longer sends normal hunger signals properly.
ProveniIncluded in official guidelines, or approved by EMA or FDA
Eating regularly — not only when you feel hungry — helps prevent malnutrition. Also, having appetizing food available and creating mealtimes with attention can help.
This often requires structure and support from caregivers or care providers.
Supplements and herbal tea
Online there is much information about supplements and herbal teas for dementia. Research into these is cautious.
ResearchediPositive results in clinical studies, not yet standard treatment
A Japanese study looked at herbal preparations for loss of appetite and apathy. Results were cautiously positive, but this is one study and it did not fit standard protocols. Many supplements are unproven or can interact with medications.
Adding supplements on your own without consultation is not safe. Always discuss it with your doctor.
Salt, sugar and cholesterol
Traditionally, people with heart problems or high blood pressure receive dietary advice about salt, sugar or fat. With Lewy body dementia and limited appetite, this may be more nuanced.
ResearchediPositive results in clinical studies, not yet standard treatment
Malnutrition weighs more heavily than mild dietary restrictions. Sometimes strict diets are abandoned because calorie intake takes priority. This is very individual.
Ask your team (doctor, dietitian) how this applies to your situation.
Practical approach
Good eating with Lewy body dementia is not about one 'key substance', but about:
- Regular meals with sufficient calories
- Food that is appealing and easy to eat
- Awareness of swallowing difficulties
- Preventing medication-food interactions
- Monitoring weight and nutritional status
ProveniIncluded in official guidelines, or approved by EMA or FDA
Structured nutritional care (planned meals with supervision) helps prevent malnutrition and slowing of decline.
A dietitian specialised in neurology or geriatrics can help tailor these matters to your specific situation.
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_This information never replaces a doctor's judgment. Always discuss your situation with your own healthcare provider._