Key Moments
Dominic D'Agostino, Ph.D. on Modified Atkins Diet, Keto-Adaptation, Ketosis & More
FoundMyFitnessKey Moments
Dr. D'Agostino discusses keto diets, exogenous ketones, and their therapeutic potential.
Key Insights
Nutritional ketosis, defined by elevated blood ketones (1-3 mmol/L), has therapeutic effects for neurological disorders by stabilizing brain energy metabolism.
Exogenous ketone supplements (esters and mineral salts) can mimic the benefits of a ketogenic diet by rapidly achieving and sustaining ketosis.
Modified Atkins diet (65-70% fat, 20-30% protein) is a more accessible and effective approach than the classical 4:1 ketogenic diet for many conditions.
Ketones are signaling molecules that can influence cell signaling, gene expression (e.g., FOXO3), and mitochondrial efficiency, potentially suppressing reactive oxygen species.
Ketone supplementation, particularly with ketone esters, shows promise in enhancing survival in metastatic cancer models and delaying CNS oxygen toxicity.
The gut microbiome's health is a significant consideration with ketogenic diets, and a well-formulated diet rich in diverse fibrous vegetables is crucial.
DEFINING NUTRITIONAL KETOSIS AND ITS APPLICATION
Nutritional ketosis is defined by achieving and sustaining elevated blood ketone levels, ideally between 1 and 3 mmol/L. This metabolic state is crucial for managing neurological disorders, as it stabilizes brain energy metabolism. The ketogenic diet, a low-carbohydrate, high-fat approach, induces nutritional ketosis. However, individual responses vary, making personalized dietary strategies important. The suppression of insulin is a key driver of ketogenesis, with implications for conditions like type 2 diabetes.
EXOGENOUS KETONES AS THERAPEUTIC AGENTS
Exogenous ketones, such as beta-hydroxybutyrate esters and mineral salts, are being developed to mimic the therapeutic and performance-enhancing effects of the ketogenic diet. These supplements offer a rapid way to achieve and sustain ketosis without strict dietary adherence. Research is focused on improving their palatability and understanding their potency for various disorders. Beta-hydroxybutyrate, in particular, acts as both an energy source and a powerful signaling molecule with therapeutic potential.
EVOLUTION OF KETOGENIC DIETARY STRATEGIES
The classical ketogenic diet, characterized by strict macronutrient ratios like 4:1 (fat to carbohydrates/protein), was historically used for drug-resistant epilepsy. However, a modified Atkins diet (MAD), with roughly 65-70% fat, 20-30% protein, and 5-10% carbohydrates, demonstrates similar therapeutic potency with greater accessibility. This modified approach allows for more liberal protein intake and the inclusion of medium-chain fatty acids, making it more sustainable for individuals.
KETONES AND CELLULAR SIGNALING MECHANISMS
Beyond energy production, ketones, especially beta-hydroxybutyrate, are potent signaling molecules. They can influence gene expression, activating genes involved in stress response and longevity, like FOXO3. Ketones also enhance mitochondrial efficiency, potentially leading to reduced reactive oxygen species (ROS) production. This improved bioenergetic efficiency means cells can generate more ATP with less oxygen, contributing to overall cellular health and resilience.
IMPACT ON CANCER AND OXIDATIVE STRESS
Research suggests that ketones can have anti-cancer effects, as demonstrated by enhanced survival rates in metastatic cancer models when supplemented on a high-carbohydrate diet. Ketones may inhibit glycolysis and influence gene expression pathways related to cancer growth, possibly by acting as histone deacetylase inhibitors. While high-fat diets can paradoxically increase endotoxin release, moderate ketone supplementation might help manage oxidative stress in normal tissues, though its role in tumor tissue is complex.
BRAIN METABOLISM AND NEUROPROTECTION
Ketones readily cross the blood-brain barrier and serve as a crucial alternative fuel source, especially during periods of glucose deprivation or in neurological conditions like Alzheimer's disease and traumatic brain injury where glucose metabolism may be impaired. Ketones can increase brain blood flow and may play a role in upregulating GABA, a neurotransmitter that stabilizes neuronal activity. Studies also indicate that medium-chain fatty acids can efficiently cross the blood-brain barrier and be used as fuel.
THE ROLE OF KETOGENIC DIETS IN GUT HEALTH
The gut microbiome's response to ketogenic diets is a developing area of research. While high-fat diets can impact gut permeability and endotoxin levels, a well-formulated ketogenic diet incorporating diverse fibrous vegetables is considered crucial for maintaining gut health and microbial diversity. These vegetables act as carriers for fats and slow digestion, helping to regulate insulin response and support a healthy gut environment.
KETO-ADAPTATION AND METABOLIC FLEXIBILITY
Keto-adaptation refers to the physiological shift where the body becomes proficient at using fatty acids and ketones for fuel. This process involves upregulating ketone transport and utilization mechanisms, alongside increasing cellular oxidative capacity. This metabolic flexibility, the ability to efficiently switch between fuel sources, is associated with beneficial metabolic processes like mitochondrial biogenesis and reduced inflammation, contributing to overall health and longevity.
POTENTIAL FOR EXOGENOUS KETONES VS. DIETARY APPROACHES
The research aims to determine if exogenous ketone supplementation can replicate all the benefits of a ketogenic diet. Preliminary studies, particularly in oxygen toxicity models, show significant protective effects with ketone esters, even on high-carbohydrate diets. Similarly, in metastatic cancer models, ketone supplementation demonstrated enhanced survival. These findings suggest that ketones themselves possess therapeutic properties that can be leveraged independently of a strict ketogenic diet.
METFORMIN AND ITS POTENTIAL IMMUNOMODULATORY EFFECTS
Metformin, often prescribed for type 2 diabetes, has shown potential protective effects against certain cancers, possibly by mimicking caloric restriction pathways and influencing AMP kinase. Emerging research suggests Metformin may also favorably shift the gut microbiome, contributing to its therapeutic benefits. Its potential role in cancer prevention and management, possibly through hormetic effects on mitochondria and influencing nutrient signaling, is an active area of investigation.
GLUCOSE HOMEOSTASIS AND KETOGENESIS
Even in states of ketosis, the body maintains essential glucose levels through gluconeogenesis, primarily utilizing glycerol, lactate, and glucogenic amino acids. Red blood cells, which lack mitochondria, rely on glucose. This process ensures a stable glucose supply for vital functions, while insulin levels significantly decrease, suppressing insulin signaling pathways. Ketones also play an anti-catabolic role, protecting skeletal muscle and preserving protein.
GLUTAMINE'S DUAL ROLE IN HEALTH AND DISEASE
Glutamine is a critical nutrient for gut health and immune function, but it is also a preferred fuel source for many cancer cells. For individuals with non-GI cancers, supplementation might not be beneficial and could potentially fuel tumor growth. However, for those with impaired gut function due to cancer treatments, oral glutamine may aid in gut repair. The decision to supplement should be individualized, considering the type and location of cancer and overall health status.
DEVELOPMENT OF KETOGENIC FOODS AND SUPPLEMENTS
Efforts are underway to develop ketone supplements with improved taste and efficacy, alongside ketogenic food products that mimic the taste of traditional high-sugar foods. These advancements aim to increase compliance with ketogenic diets, particularly for therapeutic purposes. The focus is on creating palatable and effective options that integrate seamlessly into daily life, making the benefits of ketosis more accessible to a broader population.
APOE4 STATUS AND KETONE THERAPY OUTCOMES
Some research indicates that the effectiveness of ketone supplementation in improving cognitive function may be dependent on APOE4 status. While a specific study showed benefits in non-carriers, the positive correlation was not observed in APOE4 carriers. This suggests that genetic factors might influence how individuals respond to ketone-based interventions, highlighting the need for personalized approaches in neurological applications.
Mentioned in This Episode
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●People Referenced
Common Questions
Nutritional ketosis is defined as achieving and sustaining blood ketone levels above 0.5 millimolar, ideally between 1 and 3 millimolar. It's primarily achieved through a low-carbohydrate, high-fat diet, which suppresses insulin and drives hepatic ketogenesis. Individual responses vary based on factors like health status and gender.
Topics
Mentioned in this video
A type of ketone supplement being developed to mimic the therapeutic effects and performance-enhancing effects of the ketogenic diet, and which are likely the most powerful form of exogenous ketones.
Ketone supplements created by combining a ketone body like beta-hydroxybutyrate with an essential electrolyte.
A medium-chain fatty acid that may suppress ghrelin, a hunger hormone, in the gut.
A lactate-based sports supplement, designed by George Brooks, used as an alternative fuel source.
A PhD student in Dr. D'Agostino's lab who is researching the effects of Metformin and Doroacetate (DCA) on cancer cells.
A neurologist at John's Hopkins who has advanced the use of the modified Atkins diet and ketogenic diet for drug-resistant epilepsy.
A professor at Boston College who developed an aggressive metastatic cancer model, which Dr. D'Agostino's lab used to study ketone supplementation effects on cancer.
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