A groundbreaking study has revealed the hidden long-term risks of the keto diet, shedding fresh light on its impact on broader metabolic health. Despite its widespread popularity as a powerful tool for rapid weight loss and managing conditions like obesity and type 2 diabetes, this high-fat, ultra-low-carb eating pattern may come with serious consequences that only emerge over time.
The ketogenic diet triggers a profound metabolic switch. By drastically cutting carbohydrate intake, it forces the body into ketosis. This natural survival state was originally designed for periods of starvation. In ketosis, the liver transforms stored fat into ketone bodies. These serve as an alternative fuel that powers both the body and brain when glucose from carbohydrates runs low. Rather than burning sugar, your system starts running entirely on fat derived ketones.
As the body transitions from burning glucose to running on fat, many people experience a temporary cluster of symptoms commonly known as the keto flu. This uncomfortable phase, which typically strikes within the first few days or weeks of starting a very low carbohydrate, high fat ketogenic diet, is not a true viral illness. Instead, it reflects the body’s adjustment to using fat derived ketones for energy. Common complaints include headaches, intense fatigue, difficulty concentrating, nausea, irritability, and muscle cramps.
In the long-term study, researchers followed male and female mice for a minimum of nine months, giving them unrestricted access to food. The animals were divided into four groups, with each assigned a different diet. The diets were a classic high-fat Western diet, a low-fat high-carbohydrate diet, a strict ketogenic diet where almost all calories were derived from fat, and a low-fat diet carefully matched for protein content.
The findings were striking. Mice on the ketogenic diet rapidly developed serious metabolic disturbances, with some abnormalities appearing in as little as a few days. The near-total exclusion of fruits, vegetables, whole grains, and legumes created widespread deficiencies in vital vitamins, minerals, and dietary fiber, which in turn disrupted digestion and compromised long-term health.
Far from shielding the liver, the ketogenic diet actually worsened fatty liver disease. The buildup of fat in the liver is a classic sign of metabolic dysfunction linked to obesity. Although mice are not identical to humans, these results uncover serious, previously overlooked long-term metabolic dangers that anyone thinking about adopting the ketogenic diet should carefully consider.
To view the original scientific study click below:
A long-term ketogenic diet causes hyperlipidemia, liver dysfunction, and glucose intolerance from impaired insulin secretion in mice
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