🥑 Ketogenic Diet: a complete guide to the eating strategy that transforms your metabolism
🔍 What is the ketogenic diet?
Theketogenic diet, or simplyketo, is a dietlow in carbohydrates, rich in good fats, and moderate in protein. Unlike classic low-calorie diets, ketodoes not rely on calorie counting, buton changing the primary energy source: from glucose to fats.
Its name comes from ketosis, a natural metabolic state in which the body, not having enough sugars to burn, starts producing ketone bodies from fats. And these ketones become the main fuel.
⚙️ How metabolism works in ketosis
Under normal conditions, the body uses glucose (derived from carbohydrates) to produce energy. However, when carbohydrate intake is drastically reduced (below 50g net per day), hepatic and muscle glycogen stores are depleted within 1–3 days.
At that point, the liver begins to:
- transform fatty acids into ketone bodies (β-hydroxybutyrate, acetoacetate, acetone)
- send them into the bloodstream as a new energy source
- fuel the brain, muscles, heart, and peripheral tissues without the need for sugar
This process, called ketogenesis, is the basis for the weight loss, appetite reduction, and blood sugar stabilization observed in the keto diet.
🧠 The main benefits of the ketogenic diet
✅ 1. Real and sustainable weight loss
- Promotes lipolysis (use of stored fats)
- Eliminates water retention due to carbohydrates
- Reduces appetite and hunger pangs
✅ 2. Glycemic and insulin control
- Maintains constant blood sugar levels
- Reduces insulin, promoting fat burning
- Can help with insulin resistance, type 2 diabetes, PCOS
✅ 3. Cognitive benefits
- Ketones continuously fuel the brain with less "energy slump"
- Many report increased concentration, clarity, less brain fog
✅ 4. Anti-inflammatory effect
- Reduction of inflammatory markers (CRP, IL-6)
- Positive effect in autoimmune diseases, chronic inflammatory conditions, and joint pain
✅ 5. Therapeutic effects in clinical settings
- Used for decades in the treatment ofrefractory epilepsy
- Emerging studies on Alzheimer's, Parkinson's, migraines, brain tumors
🍽️ What do you eat on a ketogenic diet?
The ketogenic diet is based on foods rich in healthy fats, quality protein sources, and low-carb vegetables.
✅ Allowed foods:
- Fats: extra virgin olive oil, butter, ghee, coconut oil, avocado
- Proteins: meat, fish, eggs, aged cheeses
- Low-carb vegetables: zucchini, cauliflower, spinach, mushrooms, cucumbers
- Low-carb fruits: avocado, olives, berries in controlled quantities
- Drinks: water, coffee, green tea, herbal teas
❌ Foods to avoid:
- Bread, pasta, rice, cereals, potatoes
- Sweets, biscuits, snacks, sugary drinks
- Sugary fruits (bananas, apples, grapes, mango)
- Legumes (beans, lentils, chickpeas)
- Ultra-processed industrial products
📊 How are macronutrients distributed?
A classic ketogenic diet includes:
| Macronutrient | Percentage | Function |
|---|---|---|
| Fats | 70–75% | Primary energy source |
| Proteins | 20–25% | Muscle mass maintenance |
| Carbohydrates | 5–10% | (<50g net/day) |
Netcarbohydrates are calculated as:
Total Carbohydrates – Fiber – Polyols (if present)
⛑ Possible side effects and adaptation
“Keto flu”
This is a transitional phase during which you may experience:
- fatigue
- headache
- irritability
- nausea
- difficulty concentrating
📌 Remedies:
- increase intake of electrolytes (sodium, magnesium, potassium)
- drink plenty of water
- avoid intense training in the first few days
Other effects:
- Ketone breath: temporary fruity odor
- Constipation: compensate with fiber from vegetables and water
- Menstrual changes or irregular cycles: transient, related to adaptation
👩⚕️ Is it suitable for everyone?
The ketogenic diet is not a universal diet. It is important to evaluate with a professional whether it is compatible with your physical and clinical condition.
Contraindications:
- Pregnancy and breastfeeding (unless medically indicated)
- Advanced kidney and liver disease
- Eating disorders (past or present)
- Use of hypoglycemic drugs: supervision required
🧬 What does science say?
- Type 2 Diabetes: improved insulin sensitivity and reduced medication
- Obesity: more effective than standard hypocaloric diets in the first 6 months
- Neurology: documented efficacy in controlling epilepsy and promising in slowing neurodegenerative diseases
- Inflammation and metabolic markers: significant reduction in triglycerides, blood glucose, blood pressure
📚 Sources:
- “Ketogenic Diet: Evidence for Optimized Fat Metabolism”, Frontiers in Nutrition
- “A low-carbohydrate, ketogenic diet to treat type 2 diabetes”, Nutrition & Diabetes
- “Ketone Bodies and Brain Metabolism”, Nature Reviews Neuroscience