Low-carbohydrate diets are gaining increasing attention, particularly for their impact on weight loss and metabolic health. Among them, two approaches stand out: the low-carb diet and the ketogenic diet.
Often confused, these approaches are based on different principles and do not have the same effects on the body. Before adopting either strategy, it is essential to understand how they work, along with their benefits and potential risks.
Low-carb diets: what does it really mean?
A low-carb diet involves reducing carbohydrate intake in daily nutrition. While standard dietary guidelines recommend around 50% of total energy intake from carbohydrates, low-carb approaches typically reduce this to below 30%.
However, not all low-carb strategies are the same. Some focus on simple healthy eating balance, while others, such as the ketogenic diet, lead to a profound shift in metabolism.
The ketogenic diet: a metabolic shift
The ketogenic diet is based on a drastic reduction in carbohydrate intake, limiting it to just 10–15% of total calories. In the absence of sufficient glucose, the body switches to an alternative fuel source: fat.
This process leads to the production of ketone bodies, a metabolic state known as ketosis. This state is similar to what happens during prolonged fasting.
Originally developed for medical purposes, particularly for treating epilepsy, the ketogenic diet has become popular for rapid fat loss and weight reduction.
Potential health benefits
In specific contexts, the ketogenic diet may offer certain benefits. Studies have shown improvements in some individuals with type 2 diabetes, including better blood sugar control, weight loss, and improved cardiovascular markers.
However, these benefits should be interpreted cautiously. Long-term evidence remains limited, and results can vary significantly depending on individual health conditions.
Limitations of the ketogenic diet
Despite fast results, the ketogenic diet comes with important constraints. Its highly restrictive nature makes it difficult to sustain and may lead to nutritional imbalances.
Unbalanced nutrition, often low in fibre, fruits, and whole foods, and high in saturated fats.
Reduced physical performance, due to limited carbohydrate availability.
Metabolic stress, potentially affecting kidney and bone health.
Weight regain risk, once carbohydrates are reintroduced.
Restrictive eating behaviours, potentially leading to unhealthy relationships with food.
While useful in certain medical situations, this diet requires careful supervision and is not suitable for everyone.
Low-carb vs keto: a real-life meal example
The image at the top of this article clearly illustrates the difference between a low-carb meal and a keto meal, using a beef and lamb kefta tagine prepared in two ways.
Low-carb version
- Main ingredients: beef and lamb, vegetables, chickpeas (high-fibre complex carbohydrates)
- Weight & calories: approx. 400 g – 450 to 500 kcal
- Carbohydrates: 30–35 g
- Fibre: 8–10 g
Keto version
- Main ingredients: beef and lamb, vegetables only
- Weight & calories: approx. 400 g – 500 to 550 kcal
- Carbohydrates: 10–15 g
- Fibre: 4–6 g
Both meals are nutritionally rich. However, the low-carb version, thanks to its higher fibre content and complex carbohydrates, promotes long-lasting satiety and more stable energy levels. This real-life example highlights how carbohydrate quality and quantity impact overall nutrition.
Low-carb: a more sustainable approach
Unlike keto, the low-carb diet is more flexible. It does not eliminate carbohydrates entirely but focuses on quality over quantity.
Whole foods such as vegetables, fruits, legumes, and whole grains remain essential, while processed and sugary foods are reduced.
This approach supports a balanced diet, better digestion, and sustained energy.
Low-carb benefits for weight and health
Research shows that low-carb diets can support sustainable weight loss and improve metabolic health markers.
They are particularly effective for managing type 2 diabetes, insulin resistance, and obesity.
By stabilising blood sugar and increasing satiety, they help regulate appetite naturally.
How to follow a low-carb lifestyle
Choose whole, high-fibre carbohydrates
Reduce portion sizes gradually
Limit processed and sugary foods
Focus on protein and healthy fats
Adopt a progressive approach
Low-carb vs keto: which is better?
Both diets can lead to weight loss, but their long-term impact differs.
The ketogenic diet is more restrictive and harder to maintain, while low-carb offers a more balanced and sustainable solution.
Ultimately, the best approach is one that supports long-term health, energy, and lifestyle.
