The Skinny on Low Carbohydrate Diets The University of Georgia Cooperative Extension Service.
Low Carbohydrate Diets and The...
Transcript of Low Carbohydrate Diets and The...
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Low Carbohydrate Diets
and The Brain
Eric H. Kossoff, MD
Medical Director, Ketogenic Diet Center
Associate Professor, Neurology and Pediatrics
Johns Hopkins Hospital
Baltimore, Maryland
July 9, 2010
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Topics
• The Ketogenic Diet for Epilepsy
• What is the “Modified” Atkins Diet?
• Other neurological disorders and low
carbohydrate diets?
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What is Epilepsy?
• Repeated seizures
• Electrical abnormality
of the brain
– Can be genetic or a
structural cause
• Unpredictable and
terrifying
• Medications started in
most cases
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Seizure-Free Rates With Different Strategies
Kwan P, Brodie MJ. N Engl J Med. 2000.
Seizure-free
monotherapy
1st AED
47%
Not seizure-free
All regimens attempted
36%
Seizure-free
polytherapy
3% Seizure-free
monotherapy 3rd AED
1%
Seizure-free
monotherapy 2nd AED
13%
?
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The Ketogenic Diet: Basics
• 90% calories are fat
– 4:1 ratio of fat: carb+protein
(grams) most common
• Fluid and calorie-limited
• Foods weighed on gram scales
• Typically started in the hospital
over 4 days
– 24-hour fasting period optional
• Children continued for about 2
years if effective
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Henderson J Child Neurol 2006
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6-Month Seizure Reduction from Ketogenic Diet
<50%
Seizure-free
90-99%
50-90%
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Bough Epilepsia 2007
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“Ideal” Diet Situations
• Glut-1 deficiency
• Pyruvate dehydrogenase deficiency
• Infantile spasms
• Doose syndrome
• Severe myoclonic epilepsy of infancy (Dravet)
• Rett syndrome
• Patients receiving formulas only
• Combination therapy with vagus nerve stimulation
• Patients on zonisamide
• Recently worsened seizures
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Ketogenic Diet: Side Effects
• Common (50%)
– Constipation
– Slowed weight gain
– Acidosis
• Occasional (5%)
– Reduced height velocity
– Significant dyslipidemia
– Renal stones
– Gastrointestinal upset
• Rarely leads to diet discontinuation
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Kossoff Epilepsia 2009
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What about years after the ketogenic diet is over?
• 101 families surveyed
– Current age: 13 years (2-26)
– Median 6 years post-KD
• Seizure control generally still good
• Labs normal
– Mean total cholesterol: 158 mg/dl
• Height/weight/BMI normal
• No myocardial infarctions
Patel Epilepsia 2010
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Is There an “Alternative” Diet?
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Topics
• The Ketogenic Diet for Epilepsy
• What is the “Modified” Atkins Diet?
• Other neurological disorders and low
carbohydrate diets?
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• No calorie restriction
• No fluid restriction
• No hospital admission (clinic education)
• No weighing of foods on gram scales
• No fasting required
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How is it “modified”?
• High fat foods
strongly encouraged
• High fat foods are
allowed
Modified Atkins Atkins
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How is it “modified”?
• High fat foods
strongly encouraged
• Carbs 10-20 grams
per day indefinitely
• High fat foods are
allowed
• Carbs 20 grams per
day induction
Modified Atkins Atkins
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How is it “modified”?
• High fat foods
strongly encouraged
• Carbs 10-20 grams
per day indefinitely
• Weight loss not
usually a goal
• High fat foods are
allowed
• Carbs 20 grams per
day induction
• Weight loss is a goal
– monitor calories
Modified Atkins Atkins
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Modified Atkins Diet: 2010 • 78 (49%) of 160 children and adults with
>50% seizure reduction to date
– 18 (11%) became seizure-free
• Appears more effective when a ketogenic diet formula “milkshake” is used during the initial month in children*
– 80% with seizure reduction after 1 month
• Improvement can be very rapid
Kossoff Neurology 2003; Kossoff Epilepsia
2006; Kang Epilepsia 2007; Kossoff Epilepsy
Behav 2007; Ito Brain Dev 2007; Kossoff
Epilepsia 2008; Carrette Clin Neuro
Neurosurg 2008; Weber Seizure 2008; Porta
Seizure 2009; *Kossoff J Child Neurol 2010
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Topics
• The Ketogenic Diet for Epilepsy
• What is the “Modified” Atkins Diet?
• Other neurological disorders and low
carbohydrate diets?
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Neurologic Uses for Diets Other than Epilepsy
Autism 2003
Brain tumors 2003
Depression 2004
Narcolepsy 2004
Glycogenosis Type V 2005
Alzheimer’s 2005
Traumatic brain injury 2005
Parkinson’s 2005
ALS (Lou Gehrig’s Disease) 2006
Migraine 2006
Sleep disorders 2007
Post hypoxic myoclonus 2007
Post anoxic brain injury 2008
Schizophrenia 2009
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Axona™
• Approved March 2009
• 2 studies showing benefit
– Both sponsored and
authored by Accera, Inc.
• Alzheimer’s Association
– “medical foods a subject of
concern”…
Henderson Neurotherapeutics 2008
Henderson Nutr Metab 2009
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Head trauma
Fluid percussion model; KD started immediately after trauma.
Prins J Neurosci Res 2005
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Seyfried J Cancer Res Ther 2009
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Summary
• Low carbohydrate (and high fat) diets are becoming very widely used in epilepsy
• Other neurologic disorders under investigation
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James Rubenstein MD
Adam Hartman MD
Patti Vining MD
Mackenzie Cervenka MD
Zahava Turner RD
Jennifer Dorward RD
Bobbie Henry RD
Paula Pyzik
Gerry Harris
Jaimie Franz
Anita Charpentier, PharmD
Paula Heneberry, LCSW
Cheryl Connors, RN
Rebecca Fisher, RN
www.hopkinsmedicine.org/neurology
www.epilepsy.com/ketonews
Johns Hopkins Ketogenic Diet Center