the importance of nutrition for the person with epilepsy

8/4/2019 The Importance of Nutrition for the Person With Epilepsy

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THE IMPORTANCE OF NUTRITION FOR THE PERSON WITHEPILEPSY

The information explosion in the science of nutrition very often creates the impression that available information is contradictory.Consequently, it is no longer easy to distinguish between fact, misinformation and fiction. The Nutrition Information Centre of theUniversity of Stellenbosch (NICUS) was established to act as a reliable and independent source of nutrition information.

Correct nutrition is important for the individual with epilepsy and, apart from following a wellbalanced diet, there are specific examples of how expert dietary advice may help in the control ofepilepsy in some individuals or meet increased nutrient requirements arising primarily from themedical treatments these individuals need. Some selected aspects of the dietary management ofsuch individuals are given below:

THE KETOGENIC DIETThe Ketogenic Diet (KD) has been in use as a treatment for epilepsy since 1921. The process ofstarvation / fasting to promote seizure control has, however, been speculated about from as earlyas the 5th century by Hippocrates.

WHAT IS THE KETOGENIC DIET?The KD is a high fat, low carbohydrate (CHO) and low protein diet than induces and maintainsketosis. The KD is followed for a period of time in order to control seizures / epilepsy that have, inthe past, been unsuccessfully controlled by medication alone or in patients with unacceptabletoxicity secondary to their medical therapy (anti-convulsants).

MECHANISM OF ACTIONThe exact mechanism by which the diet works in selected people is still under dispute andgenerally unknown. The beneficial effects of the KD are however thought to be due to the inducedketosis, acidosis, dehydration and electrolyte changes that occur during the dietary management.

WHO SHOULD FOLLOW THIS DIET?Anyone who considers following this diet should do so under the direct and close supervision of aspecialist physician and dietitian.

In determining which patients should follow this diet, the following factors must be taken intoaccount:1) PATIENTS AGE

It is more difficult to induce and maintain ketosis in patients younger than 1 year and olderthan 10 years of age. Patients younger than 1 year of age are more likely to becomehypoglycemic and for this reason the KD is not recommended. The KD appears to be themost effective below 10 years with a peak efficacy of 2 5 years of age.

2) SEIZURE TYPESeizures of all types will respond to the KD, however, literature differs on which type ofseizures is most successfully treated with this diet. Regardless of seizure type, if thepatients seizure frequency or severity decreases when he / she is unable to eat, forwhatever reason, this may suggest that the KD may play a role in the successfullytreatment of his / her epilepsy.


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3) SEVERITY OF THE SEIZURE DISORDER

The KD should only be used in patients who present with severe, uncontrolled epilepsy inwhich various drug therapy regimes have failed.

4) MOTIVATION TO COMPLY WITH THE DIETThis is an important factor, as the diet must be strictly adhered to as minor infringementssuch as eating a piece of chewing gum may precipitate seizures and cause the treatment to

fail. The patient, care-giver and family must be informed that this diet needs to be followedfor a period of up to 2 years and that the diet itself is expensive, time consuming anddisruptive to the family life as a whole.

NUTRIENT SUPPLEMENTATIONAn additional aspect of the Ketogenic Diet is that by its nature the diet is deficient in some nutrientswhich they should therefore be supplemented according to age-appropriate RDA dosages. Theseinclude water soluble vitamins, fat soluble vitamins (A, D, E & K), Calcium (calcium carbonate /gluconate) and Iron.

Carnitine, as well as trace elements such as zinc and selenium, is still under investigation and nosupplementation is recommended at this stage. It is best to supplement these patients with acomprehensive sugar-free multivitamin.

It is also important to take drug nutrient interactions of the anti-convulsants into consideration.

EFFICACYThe KD is an effective tool in the management of refractory epilepsy in childhood. Availableevidence indicates that 50% of children with intractable seizures, children who are often retardedand have severe brain damage, had their seizures completely controlled by the KD. It was alsonoted that 25% of the remaining children either showed a marked decrease in seizure frequency orhad decrease medication requirements. This diet, however, is a very rigorous and should only beused as a last alternative once polypharmacology has failed. Many of the patients who aremaintained seizure-free on this diet are able to have their anti-epileptic drugs decreased orwithdrawn. This allows many of these children to become more alert and exhibit better behavior.

Carefully controlled clinical trails are needed to better assess the efficacy of the diet during its useand after its discontinuation.

COMPLICATIONSSHORT TERM COMPLICATIONSThese include dehydration, hypoglycaemia, vomiting, diarrhoea and the refusal to eat.These complications are normally experience on initiation of the diet and can be reduced by thegradual implementation of the diet or use of the modified MCT KD.

LONG TERM COMPLICATIONSThese complications can occur between 1 week and 2 years on the KD. They include kidneystones (3 5%), recurrent infections (2%), metabolic derangements such as hyperuricemia (2%),hypocalcemia (2%), decrease amino acid levels and acidosis (2%), hypercholesterolemia (29

59%), irritability, lethargy and the refusal to eat (3 9%).

VERY LONG TERM COMPLICATIONSComplications occurring after 2 years have not been reported

If anyone wants to implement the ketogenic diet, it can only be under expert guidance from adoctor and dietitian.

DIETARY CONCERNS ASSOCIATED WITH THE USE OF ANTICONVULSANTSMedications can affect nutritional status by interfering with the absorption, metabolism andexcretion of nutrients in the food. When vitamins, minerals, or other food components alter drug


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utilization or when drugs induce nutritional deficiencies, the effect poses a risk to the patient. Themanagement of epilepsy requires long-term care and drug therapy (anticonvulsants), frequentlyinvolving the use of multiple drugs. Anticonvulsant drugs such as phenytoin, phenobarbital, andprimidone have been shown to induce clinical deficiencies of folate, biotin, and vitamin D.

SUMMARY OF THE INTERACTIONS BETWEEN ANTICONVULSANT DRUGS ANDNUTRIENTS

1. Phenobarbitone (Trade names: Adco-phenobarb-vitalet, Gardenal, GaroinNorstan-Phenobarbitone)

Drug-nutrient interactionsPhenobarbitone has been shown to cause deficiencies of Vitamins D, B12, B6 and Folate as wellas Calcium and Magnesium. Vitamin D deficiency may result in a decreased bone density,osteoporosis, rickets or osteomalacia. The decrease in serum (blood) folate and Vitamin B12 maycause megaloblastic anemia. The drug increases the excretion of Vitamin C in the urine anddecreases the absorption of thiamin. Phenobarbitone may also cause appetite changes and isexcreted in breast milk.

Dietary Suggestions

Avoid alcohol consumption. Ensure an adequate exposure to direct sunlight. Eat a diet that includes good sources of Vitamin D (fish liver oils, butter, egg yolk, liver), folate

(fresh green leafy vegetables, fruit, organ meats, dried nutritional yeast), Vitamin B12 (yeast,liver, beef, eggs, kidney), Vitamin B6 (yeast, organ meats, legumes, whole-grain cereals, fish)and calcium (dairy products, nuts, oranges, broccoli). Include good sources of Magnesium(green leafy vegetables, nuts, cereals, grains and seafood).

2. Phenytoin (Trade names: Epanutin and Garoin)Drug-nutrient interactionsPhenytoin has been shown to cause deficiencies of Vitamins D, B12 and folate as well as Calciumand Magnesium. The deficiency of Vitamin D may result in a decreased bone density and cause

rickets, osteoporosis or osteomalacia. The decrease in serum folate and Vitamin B12 may causemegaloblastic anemia. Phenytoin may cause constipation, nausea, vomiting and is excreted inbreast milk. It may also increase blood glucose and dietary treatment might be necessary.

Dietary Suggestions Avoid alcohol consumption Ensure an adequate exposure to direct sunlight (Vitamin D is synthesized in the skin by

exposure to direct sunlight). Eat a diet that includes good sources of Vitamin D (fish liver oils, butter, egg yolk, liver), folate

(fresh green leafy vegetables, fruit, organ meats, dried nutritional yeast), Vitamin B12 (yeast,liver, beef, eggs, kidney), and calcium (dairy products, nuts, oranges, broccoli). Include goodsources of Magnesium (green leafy vegetables, nuts, cereals, grains and seafood).

Supplementation: 400-800 IU Vitamin D and 0.4-1 mg folic acid per day (consult with a doctor

or dietitian). Take the drug with food or milk.

3. Carbamazepine (Trade names: Tegretol, Tegretol S, Prozine, Carpaz andDegranol)Drug-nutrient interactions


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There are indications that it may decrease serum (blood) levels of folic acid and Vitamin B12,however supplementation is only advised with confirmed low serum (blood tests) levels.

Dietary Suggestions Avoid alcohol consumption. Treat nausea, vomiting, abdominal pain, diarrhoea and constipation.

4. Ethosucximide (Trade name: Zarontin)Drug-nutrient interactionsThe drug decreases serum levels of Vitamin D. Other side effects: loss of appetite, nausea,vomiting, abdominal pain and anorexia. (Eat small frequent meals; Fluids should be taken betweenmeals; Excess fat should be avoided; lightly flavored food is normally better tolerated).

Dietary Suggestions Avoid alcohol consumption. Treat nausea and vomiting and anorexia. (Eat small frequent meals; Fluids should be taken

between meals; Excess fat should be avoided; lightly flavored food is normally better tolerated).

5. Sodium Valproate (Trade names: Convulex and Epilim)Drug-nutrient interactionsThe drug does not cause nutrient deficiencies, but may cause nausea, vomiting, diarrhoea andconstipation. In general, these symptoms disappear after a while.

Dietary Suggestions Never take the drug on an empty stomach; eat a small meal or snack 10 20 min before taking

this drug.

For further, personalized and more detail information, please contact NICUS or a dietitian registeredwith the Health Professions Council of South Africa.

References from the scientific literature used to compile this document are available on request.

NICUSNutrition Information Centre of the University of StellenboschDivision of Human NutritionP.O. Box 19063, Tygerberg, 7505Tel: (27) 021-933 1408Fax: (27) 021-933 1405E-mail: [email protected]: www.sun.ac.za/nicus/

the importance of nutrition for the person with epilepsy

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