Can the Keto Diet Cause Fatty Liver Disease? What the Science Says

The ketogenic, or “keto,” diet has become a major trend for weight loss. The principle is to drastically reduce carbohydrate intake while consuming high amounts of fat. However, a recent study conducted on mice suggests that this high-fat diet may, over the long term, place a significant strain on the liver and metabolism. Here’s a closer look at how the diet affects the body.

The Study: Lasting Health Concerns in Mice

In the study, mice were fed a keto-like diet with varying fat and protein content for an extended period of 36 to 44 weeks, during which they could eat as much as they wanted. While the highest-fat variant did lead to limited weight loss, this benefit came at the cost of serious health problems.

Compared to a control group on a low-fat diet, the keto-diet mice did not lose weight as effectively. More alarmingly, their cholesterol and blood lipid levels increased dramatically. The diet also induced severe glucose intolerance by impairing insulin secretion from the pancreas. A key finding was that male mice developed signs of liver dysfunction and non-alcoholic fatty liver disease, while female mice appeared to tolerate the diet better, highlighting a potential difference in how sexes metabolize high-fat diets.

How the Keto Diet Works in the Body

The diet’s mechanism is to induce a metabolic state called ketosis. When the body is deprived of carbohydrates, its primary energy source, it begins to break down fat at an accelerated rate. The liver converts these fats into molecules called ketone bodies, which the brain and other organs then use for fuel instead of glucose.

A Diet with Medical Roots, Not Just a Modern Trend

It’s important to note that the keto diet is not a new invention. It has been used for decades as a therapeutic treatment for drug-resistant childhood epilepsy, as it successfully reduces the frequency of seizures in many cases—though the exact reasons are still not fully understood. Its popularity as a mainstream weight-loss trend, however, is a more recent phenomenon.

Conclusion

While effective for short-term weight loss, this research adds to the growing body of evidence that long-term adherence to a ketogenic diet may carry significant metabolic risks, including the potential for fatty liver disease and insulin resistance. As this study was conducted on mice, further research in humans is necessary to confirm these effects. Individuals considering the diet should consult a healthcare professional to weigh the benefits against the potential risks.

 

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