The ketogenic diet, widely celebrated for its high-fat, low-carbohydrate, and protein-rich approach to weight loss, may pose significant risks to heart health if followed improperly or for extended periods. Leading cardiologist Dr Francesco Lo Monaco, founder of the National Heart Clinic in London, warns that many keto enthusiasts make a critical mistake that could elevate their cholesterol and strain their cardiovascular system.
Keto works by limiting carbohydrate intake so drastically that the body enters a state called ketosis, where it burns fat for energy instead of glucose. While effective for short-term weight loss, Dr Lo Monaco cautions that the diet’s high-fat content often results in increased levels of LDL, commonly known as “bad” cholesterol. This is particularly concerning for individuals who already have existing cholesterol or heart issues.
“Many people overlook that the ketogenic diet, due to its heavy reliance on fats, can raise LDL cholesterol, potentially accelerating heart disease risks,” Dr Lo Monaco explains. “Even those with average cholesterol should be cautious, as elevated LDL contributes to arterial strain.”
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A common pitfall in the keto community is the long-term adherence to this restrictive regimen. Dr Lo Monaco highlights that sustained restriction of carbohydrates means missing out on vital nutrients from other food groups, making keto unsustainable and potentially harmful in the long run.
Another crucial factor influencing cardiovascular risk on keto is the quality of fats consumed. “Not all fats are created equal,” Dr Lo Monaco emphasizes. Diets high in saturated fats—found in processed meats, butter, and cheese—can trigger inflammation and promote plaque buildup in arteries. Conversely, incorporating healthier fats, such as olive oil, nuts, seeds, and oily fish, can mitigate these risks while aligning better with heart health goals.
Despite the initial rapid weight loss many experience on keto, Dr Lo Monaco notes the challenge of maintaining these results. “Weight often rebounds once carbohydrates are reintroduced, leading to frustrating cycles that can undermine both heart health and wellbeing,” he says.
Instead of extreme dieting, Dr Lo Monaco advocates for balanced, evidence-based nutrition plans. The Mediterranean diet, rich in vegetables, fruits, legumes, healthy fats, moderate fish, and lean proteins, stands out as a heart-friendly alternative. It’s sustainable, less restrictive, and supports long-term cardiovascular health.
In summary, while keto may offer short-term benefits, it is essential to approach it cautiously, emphasizing fat quality, limiting duration, and considering overall heart health to avoid unintended consequences.