The keto diet has many health benefits on the brain and blood sugar levels. By improving brain health and blood sugar regulation, it decreases your risk for neurodegenerative diseases and diabetes — helping you live longer and better.
The keto diet has many health benefits on the brain and blood sugar levels. By improving brain health and blood sugar regulation, it decreases your risk for neurodegenerative diseases and diabetes — helping you live longer and better.
What is the ketogenic diet?
The ketogenic diet (KD) is the most extreme type of low-carbohydrate diet. It involves a very low-carbohydrate, moderate protein, and high fat intake — typically 5–10% carbohydrates, 30–35% protein, and 55–60% fat.
Types of ketogenic diet
Standard ketogenic diet (SKD)
The most common form: 10% carbohydrates, 20% protein, 70% fat. Suitable for most individuals seeking metabolic benefits.
Cyclical ketogenic diet (CKD)
Five days of standard ketogenic diet alternated with two days of higher carbohydrate intake. May aid body composition and muscle recovery — consult a nutrition specialist before starting.
Targeted ketogenic diet (TKD)
Same macronutrient ratio as SKD, but allows additional carbohydrates around exercise windows to support athletic performance.
High-protein ketogenic diet
Modifies the SKD to allow higher protein intake, often used for muscle preservation in older adults.
Brain health benefits
Ketones — the metabolic byproduct of fat oxidation — serve as an alternative fuel source for the brain. Research suggests ketones may be more efficient than glucose for brain energy metabolism, and some studies indicate potential benefits in Alzheimer's disease, epilepsy, and other neurological conditions.
The anti-inflammatory effects of ketosis may also protect against age-related neurodegeneration. By reducing blood glucose and insulin levels, the ketogenic diet may lower the risk of type 2 diabetes, a known risk factor for cognitive decline.
Metabolic and longevity benefits
- Improved insulin sensitivity — reduced blood glucose variability supports metabolic health
- Weight management — appetite suppression and fat oxidation support healthy body composition
- Reduced inflammation — ketone bodies act as signalling molecules with anti-inflammatory effects
- Mitochondrial efficiency — fat oxidation may improve mitochondrial function
"Ketosis represents a metabolic state that evolution designed for periods of food scarcity — one that appears to activate longevity pathways in ways that caloric restriction does." — Longevity World Group
Considerations and cautions
The ketogenic diet is not suitable for everyone. Individuals with certain metabolic conditions, kidney disease, or those on specific medications should consult their physician before starting. The initial "keto flu" — fatigue, headache, and irritability during the adaptation phase — is common and typically resolves within one to two weeks.
Long-term adherence can be challenging, and nutritional deficiencies in micronutrients (particularly electrolytes, magnesium, and certain B vitamins) should be monitored and supplemented as needed.
