Keto Diets

What is the Ketogenic diet?

Commonly called keto, the ketogenic diet was first established in 1924 as a therapeutic intervention for epilepsy. When children with epilepsy continued to experience seizures despite following prescribed antiepileptic drug treatment, adhering to a medically supervised ketogenic regimen, typically overseen by neurologists and dietitians, proved highly effective at reducing the frequency of seizure events. In recent decades, however, this high-fat, low-carbohydrate eating pattern has exploded in popularity as a rapid weight-loss approach. In this overview, we explore the fundamental principles and essential elements of the ketogenic diet, detail its biochemical mechanism of action within the body, and evaluate whether it represents a viable strategy for effective, sustained weight loss.

How does Ketogenic eating work?

Under normal conditions, glucose, a simple sugar, serves as the body’s main energy currency. The ketogenic approach, however, shifts energy reliance away from glucose toward fat. This transition is accomplished by drastically cutting carbohydrate intake, which the body ordinarily converts into glucose, and opting instead for meals rich in healthy fats. As a result, metabolic processes shift, propelling the body into ketosis. Within this state, the liver converts fatty acids into ketone bodies (commonly called ketones). These molecules then supplant glucose as the body’s primary energy substrate, prompting the use of stored body fat to meet energy needs, which in turn contributes to weight loss. Despite its apparent simplicity, inducing and sustaining ketosis can be challenging. It demands a substantial carbohydrate restriction and may take several days for the body to adapt fully. Moreover, excessive protein consumption can disrupt ketone production, impeding the attainment of ketosis.

What foods are permissible on a ketogenic eating plan?

The ketogenic approach emphasises a high-fat, moderate-protein, and minimal-carbohydrate intake. Typically, macronutrient distribution relative to total daily calories is as follows:

• 70–80% fat
• 10–20% protein
• 5–10% carbohydrate

This plan restricts total carbohydrate consumption to approximately 20–50 grams per day. To illustrate, a single slice of bread contains around 15 grams of carbs, demonstrating how severely limited carbohydrates are on this regimen.

Foods commonly consumed on keto include:

• Fats: coconut oil, flaxseed oil, olive oil, macadamia oil, oil-based salad dressings, high-fat dairy (cheese, butter, cream), and animal fats (lard, tallow)
• Proteins: beef, lamb, poultry, pork, fish, seafood, eggs, and tofu (full-fat varieties)
• Vegetables: leafy greens like spinach, arugula, kale, plus broccoli, mushrooms, celery, and cabbage
• Fruits: avocado, berries such as raspberries, blackberries, strawberries, and citrus fruits like lemons and limes
• Nuts & seeds: macadamias, walnuts, almonds, sunflower seeds, flaxseeds, plus nut butters
• Beverages: tea, coffee, water, and unsweetened almond milk
• Sweeteners: low-carbohydrate sugar substitutes
• Herbs & spices

Can the Ketogenic diet promote weight loss?

Many individuals experience rapid reductions on keto for several reasons. Initially, weight losses often reflect water loss. The body retains about 3–4 grams of water for every gram of carbohydrate stored. When carbohydrates are sharply curtailed, this translates directly into a drop in water weight. Another factor is that the limited food choices often lead to a lower overall calorie intake, which naturally contributes to weight loss. Furthermore, meals high in fat and protein can enhance satiety, reducing overall hunger and thus caloric intake. Short-term studies (2–6 months) indicate that very low-carb diets can result in greater weight loss than conventional high-carb, low-fat diets; however, by 12 months, total weight loss tends to be comparable between the two strategies. Despite the initial successes, the strict nature of keto can make long-term adherence difficult. This often leads to starting and stopping the diet, fostering unhealthy yo-yo dieting or weight cycling (losing and regaining weight). Over time, these fluctuations may contribute to further weight gain, increased body fat percentage, loss of muscle mass, and heightened risk of diabetes, cardiovascular disease, and elevated blood pressure.

Is the Keto diet safe?

Regrettably, the ketogenic eating regimen carries certain risks. Below are the primary concerns associated with this high-fat, low-carbohydrate plan:

• Heart disease, Keto protocols have been linked to elevated LDL cholesterol levels, a known contributor to cardiovascular issues.
• Liver issues, Processing large amounts of dietary fat can overburden the liver and worsen any existing hepatic conditions.
• Kidney complications, Since kidneys help metabolise protein, the high protein intake on keto may strain renal function and promote kidney stone formation.
• Nutrient shortfalls, The diet’s restrictive nature limits intake of fruits, vegetables, and whole grains, raising the risk of vitamin and mineral deficiencies.
• Constipation, Eliminating high-fiber foods can lead to bowel irregularity and may increase colorectal cancer risk.

Although keto may appear to deliver rapid weight loss, it often brings unpleasant side effects:

• Fatigue
• Dehydration
• Headaches and dizziness
• Unpleasant mouth odor
• Nausea
• Poor sleep quality

It’s important to recognise that ketogenic plans do not align with the Australian Dietary Guidelines, which advise abundant consumption of fruits, vegetables, whole grains, and plant-based proteins.

How should I approach weight loss?

Long-term success in shedding pounds and keeping them off depends on adopting a sustainable strategy. Specialists recommend avoiding fad diets and instead embracing the following measures:

• Be physically active most days of the week.
• Follow a balanced diet rich in:

1. A variety of colourful fruits and vegetables 2. Whole grains 3. Lean proteins (poultry, fish, eggs, tofu, nuts, seeds) 4. Legumes and beans 5. Low-fat dairy products

• Make water your drink of choice.
• Limit saturated fats, added sugars, and salt.
• Reduce alcohol intake.

When should you see a doctor?

If you want to lose weight you should visit your doctor before changing your lifestyle or following a particular diet, especially if you have a pre-existing condition or are taking prescription medication. Your doctor knows your medical history and can provide advice on the best weight loss approach for you.