ahs13 colin champ — intermittent fasting and carbohydrate restriction in cancer management
DESCRIPTION
Dietary manipulation, including intermittent fasting, carbohydrate restriction, and ketogenic diets, all ancestral in etiology, appear to increase the efficacy of radiation therapy for cancer treatment in preclinical and clinical trials. Clinical trials incorporating such dietary manipulation are necessary.TRANSCRIPT
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Intermittent Fasting and Carbohydrate Restriction in Cancer Management
Colin E. Champ, M.D.Assistant Professor and PhysicianDepartment of Radiation OncologyUniversity of Pittsburgh Medical Center
Cavemandoctor.com
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Disclosure
• Conflicts of interest: None
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Overview
• History of dietary manipulation in prevention and cancer care
• Hypothesis and methods of action
• Current methods of dietary intervention during treatment
• Methods of implementation
• Future directions
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Cancer• In this room:• Women: 1 in 8 will be diagnosed with breast cancer• Men: 1 in 6 with prostate cancer
• Intense metabolic & cellular dysfunction• Diet/Lifestyle• Environment• Genetics
• *Some increase due to diagnostic measures
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Introduction - History
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Tannenbaum, A. Effects of Varying Caloric Intake Upon Tumor Incidence and Tumor Growth.
Annals NY Acad Sci.
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Conclusions thus far…• All studies:• 1. Placed mice on restricted diet (CR or
carbohydrates)• 2. Applied a cancerous toxin/insult • 3. Observed:
• Decrease in tumor formation/slowed tumor growth
• Cancer not eliminated!
• Can we harness the effects of nutrient restriction to aid in the treatment of cancer?
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Saleh A, et al. Caloric restriction augments radiation efficacy in breast cancer. Cell Cycle 2013
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Is it Calorie Restriction?
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If I were a mouse…
200 lbs. 40 lbs.
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Champ CE, Baserga R, et al. Nutrient Deprivation and Radiation Therapy – When Less is More. The
Oncologist, 1:2012
How does it work? - Autophagy
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Conclusions thus far…• CR augments RT efficacy:• 1. Decreased IGF pathway • 2. Increases AMPK pathway• 3. Decreases mTOR pathway
• Intermittent fasting = less weight loss• Calories restricted = primarily carbohydrates
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Insulin
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Can CR alone decrease the insulin pathway?
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Fontana L, Long-term effects of calorie or protein restriction on serum IGF-1 and IGFBP-3 concentration in humans. Aging Cell. 2008
IGF and CR
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Halberg, N et al. Effect of intermittent fasting and refeeding on insulin action in healthy men. J Applied Phys 2005.
Intermittent Fasting
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Ancel Keys Starvation Study
• 1570 calories/day• “The major food items served were whole wheat bread, potatoes,
cereals, and considerable amounts of turnips and cabbage.”
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Hite A H et al. Nutr Clin Pract 2011;26:300-308
Glucose/Insulin Pathway
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Fasting/Carbohydrate restriction better downregulate the insulin pathway…but what about the AMPK pathway?
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Amp Kinase
Action Effect
Increases glucose uptake Pulls glucose from circulation
Increases glycolysis Glycogen and glucose burned
Inhibit gluconeogenesis Decreases available glucose
Increases fatty acid oxidation
Inhibits fatty acid/cholesterol synthesis
Increases mitochondrial biogenesis More mitochondria available
Increases insulin sensitivity Per above
Downregulates mTOR Per above
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Draznin, B., et al., Effect of Dietary Macronutrient Composition on AMPK and SIRT1 Expression and Activity in Human Skeletal Muscle.
Horm Metab Res, 2012. 44(09): p. 650-655.
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Draznin, B., et al., Effect of Dietary Macronutrient Composition on AMPK and SIRT1 Expression and Activity in Human Skeletal Muscle.
Horm Metab Res, 2012. 44(09): p. 650-655.
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Draznin, B., et al., Effect of Dietary Macronutrient Composition on AMPK and SIRT1 Expression and Activity in Human Skeletal Muscle.
Horm Metab Res, 2012. 44(09): p. 650-655.
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Draznin, B., et al., Effect of Dietary Macronutrient Composition on AMPK and SIRT1 Expression and Activity in Human Skeletal Muscle.
Horm Metab Res, 2012. 44(09): p. 650-655.
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Draznin, B., et al., Effect of Dietary Macronutrient Composition on AMPK and SIRT1 Expression and Activity in Human Skeletal Muscle.
Horm Metab Res, 2012. 44(09): p. 650-655.
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Draznin, B., et al., Effect of Dietary Macronutrient Composition on AMPK and SIRT1 Expression and Activity in Human Skeletal Muscle.
Horm Metab Res, 2012. 44(09): p. 650-655.
Crossed-over
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Conclusions thus far…• Carbohydrate restriction/Intermittent fasting:• 1. Decreases IGF pathway • 2. Increases AMPK pathway• 3. Makes RT work more effectively
• Intermittent fasting may provide similar benefits vs. CR• With less potentially detrimental weight loss• Increased downregulation of IGF
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Does carbohydrate restriction simply reduce available glucose for cancer cells?
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Kubicek G, Champ C, FDG-PET staging and importance of lymph node SUV in head and neck cancer. Head and Neck Onc. 2010
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Simone BA, Champ CE, Selectively starving cancer cells through dietary manipulation: Methods and clinical implications. Future Oncology, 2013.
Metabolic Flexibility
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Ketogenic Diet• Ultimate lowering of blood glucose• Less than 20-50 g carbs/day & 70-80% fat• Aggressively lowers IGF and upregulates AMPK
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Fine E et. al. Targeting insulin inhibition as a metabolic therapy in advanced cancer: a pilot safety and feasibility dietary trial in 10 patients. Nutrition 2012.
⬆ Ketones = Insulin⬇
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Blood Glucose Values KD Pts.
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Another Benefit…
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Illustrates the power of the mind and human spirit
• Our patients must be involved in their care• Control & Autonomy
• Diet and an ancestral lifestyle empowers patients to take control of their health
• The days of medicine = sit back while we irradiate you and inject you with chemo must end!
• In many cancers, cure is possible but futile without lifestyle changes • Future cancers/metabolic disorders will lead to significant
morbidity and mortality
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Killing Weeds
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The Ancestral Solution
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In Conclusion & Going Further• Intermittent fasting/Ketogenic Diet• Potentially reduces risk of cancer in preclinical data• Aids current treatments like chemotherapy and radiotherapy
• Does it work with all cancer types• ?
• Does it replace current therapy• NO!!! – Available data points to synergy• Maybe (hopefully) one day
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Acknowledgements• Eugene M. Fine, M.D.• Albert Einstein College of Medicine
• Jeff S. Volek, Ph.D., R.D. • University of Connecticut
• Nicole L. Simone, M.D.• Kimmel Cancer Center of Thomas Jefferson University
• Rainer Klement, Ph.D.• University of Würzburg
• My amazing patients