The ketogenic diet, widely embraced for its promise of rapid weight loss, has raised concerns among heart health experts. Dr Francesco Lo Monaco, a London-based cardiologist and founder of the National Heart Clinic, warns that many keto followers unknowingly put their cardiovascular system at risk by adhering to this high-fat, low-carbohydrate regimen for extended periods.
The keto diet works by drastically reducing carbohydrate intake, prompting the body to enter a metabolic state called ketosis, where fat is used as the primary energy source. However, Dr Lo Monaco points out a critical oversight: “The ketogenic diet’s high fat content often leads to increased levels of LDL, or ‘bad’ cholesterol, which can strain the heart, especially in individuals with pre-existing conditions.”
He emphasizes that keto should be a short-term strategy rather than a long-term lifestyle. “Focusing heavily on meat and cutting out carbohydrates means missing out on essential nutrients, making it unsuitable for prolonged use,” he explains.
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Not all fats carry the same risk. Dr Lo Monaco distinguishes between types of fats consumed on keto: “Saturated fats from processed meats, butter, and cheese can contribute to inflammation and plaque buildup in arteries, elevating heart disease risk. In contrast, unsaturated fats found in olive oil, nuts, seeds, and oily fish offer cardiovascular benefits and should be prioritized.”
While keto can produce quick weight loss, Dr Lo Monaco notes the difficulty of sustaining these results and the frustration of weight fluctuations when carbohydrates are reintroduced. For lasting heart health and weight management, he advocates balanced, evidence-based diets.
“The Mediterranean diet is one of the best choices for heart health,” he says. “It is rich in vegetables, fruits, legumes, and healthy fats, with moderate fish and lean protein. It promotes long-term adherence without restrictive measures.”
In summary, while the ketogenic diet may offer short-term weight loss benefits, its potential impact on cholesterol and heart health warrants caution. Prioritizing sustainable, nutrient-rich eating patterns is essential for both cardiovascular wellness and overall well-being.