The ketogenic diet: Weighing the pros and cons

The ketogenic diet, often abbreviated as “keto,” has become a major trend in weight loss and health in recent years. High-fat, moderate-protein, and very low-carbohydrate induces a metabolic state called ketosis, where the body burns fat as its primary energy source. While the ketogenic diet has shown some results for weight loss, its potential long-term risks raise concerns and require deeper analysis.

How the Ketogenic Diet Works

The ketogenic diet relies on a simple principle: by drastically reducing carbohydrate intake and increasing fat consumption, the body enters ketosis, producing ketones from stored fat to provide energy to cells. This metabolic shift is intended to promote fat burning and weight loss, while offering potential short-term benefits such as better blood sugar regulation and reduced inflammation.

The Promises of the Ketogenic Diet

The ketogenic diet has gained popularity due to its appealing promises, including:

• Rapid Weight Loss: By inducing ketosis, the diet can lead to quick weight loss, especially in the first few weeks.
• Blood Sugar Stabilization: Limiting carbohydrates helps stabilize blood glucose and reduce spikes, which can benefit people with type 2 diabetes or prediabetes.
• Improved Cardiometabolic Health: Some studies suggest it may improve risk factors like cholesterol levels and blood pressure.

Long-Term Risks of the Ketogenic Diet

Of all diets, this one is probably among the hardest to sustain long-term. Despite potential benefits, the ketogenic diet carries long-term risks that deserve careful attention. First, it can create nutritional deficiencies. Due to severe carbohydrate restriction, it may lead to shortages in essential nutrients like fiber, vitamins, and minerals. Those are are mainly found in carbohydrate-rich foods such as fruits, vegetables, and whole grains.

Effects on Various Body Systems

• Gut: Fiber restriction can disrupt the gut microbiota balance, with potential negative consequences for intestinal health and the immune system.
• Cardiovascular: While some studies show short-term improvements in cardiovascular risk factors, others indicate that the high saturated fat content may increase long-term heart disease risk.
• Kidney: The diet can place extra stress on the kidneys due to increased urea and ketone excretion, potentially impairing kidney function in some people.
• Bones: Studies suggest the keto diet may raise the risk of bone loss and fragility due to reduced calcium absorption and disrupted acid-base balance in the body.

A Word of Caution

Although this diet may offer short-term benefits for weight loss and metabolic health, its potential long-term risks require careful evaluation. Not to mention how difficult it is to maintain. Followers often end up predisposed to regaining all the lost weight—sometimes even more—with the regained weight disproportionately as fat, particularly around the waist.

Before opting for this diet, it’s essential to consult a qualified professional to discuss the pros and cons and develop a personalized eating plan suited to your individual needs and goals. A balanced, personalized approach to nutrition is key to ensuring good long-term nutrition and optimal health.

All diets based on food restriction have little chance of producing beneficial long-term results. 95% of people who follow this path regain the lost weight, often more. Read “Getting Back into Your Bikini… or Managing Your Weight Sustainably?” for more information.

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A Long-Term Ketogenic Diet Causes Hyperlipidemia, Liver Dysfunction, and Glucose Intolerance from Impaired Insulin Secretion in Mice (2025). Science Advances.

Ketogenic Diets and Chronic Disease: Weighing the Benefits Against the Risks (2021). Frontiers in Nutrition (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8322232/).

Diet Review: Ketogenic Diet for Weight Loss (Harvard T.H. Chan School of Public Health, The Nutrition Source; updated ongoing, referencing meta-analyses up to recent years). https://nutritionsource.hsph.harvard.edu/healthy-weight/diet-reviews/ketogenic-diet/.

Advantages and Disadvantages of the Ketogenic Diet: A Review Article (2020). Cureus (PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC7480775/).