Most people know the ketogenic diet as a popular way to lose weight. Celebrities, athletes, and people trying to improve their health have embraced the low-carbohydrate eating plan over the past decade.
But scientists are increasingly discovering that the keto diet may have effects far beyond the bathroom scale. According to a new review published in Translational Neurodegeneration, this diet may help protect the brain from some of the world’s most devastating neurological diseases.
Neurodegenerative diseases affect millions of people worldwide. Conditions such as Alzheimer’s disease, Parkinson’s disease, ALS, Huntington’s disease, and multiple sclerosis gradually damage nerve cells in the brain and spinal cord.
As these cells die, patients may experience memory loss, movement problems, weakness, difficulty speaking, and loss of independence. Current treatments can often reduce symptoms, but they generally cannot stop the underlying disease process.
Researchers have therefore been searching for new approaches that target the root causes of these conditions. One area attracting growing interest is metabolism, which refers to how the body produces and uses energy. Scientists have found that many neurodegenerative diseases involve problems with energy production inside cells.
Under normal conditions, the body relies mainly on glucose for fuel. However, researchers have discovered that brain cells affected by neurodegenerative diseases often struggle to process glucose efficiently. This energy shortage may contribute to cell damage and disease progression.
The ketogenic diet changes how the body produces energy. By dramatically reducing carbohydrate intake and increasing fat consumption, the diet shifts the body into a state known as ketosis. During ketosis, the liver produces molecules called ketones. These ketones provide an alternative fuel source that can be used by the brain.
The review analyzed findings published during the last 15 years and found multiple ways in which ketones may benefit the nervous system. First, they provide energy to brain cells that may be struggling to use glucose. This alternative fuel source may help maintain normal cellular function.
The review also found evidence that ketones may protect cells from oxidative stress. Oxidative stress occurs when harmful molecules accumulate and damage tissues. Scientists believe this process plays an important role in aging and many brain diseases.
Inflammation was another major focus. Chronic inflammation is commonly observed in Alzheimer’s disease, Parkinson’s disease, and several other neurological disorders. Studies suggest that ketones may help reduce inflammatory activity, potentially slowing some of the damage occurring in the brain.
Researchers also highlighted the role of the gut microbiome. The digestive tract contains trillions of bacteria that influence digestion, immunity, and even brain function.
The ketogenic diet appears to alter the composition of these microbes in ways that may support a healthier gut environment. Because the gut and brain communicate through what scientists call the gut-brain axis, improvements in gut health may indirectly benefit the nervous system.
Another interesting finding involved autophagy, the body’s internal recycling system. Autophagy helps remove damaged proteins and cellular debris. Many neurodegenerative diseases involve the accumulation of abnormal proteins that interfere with brain function. The ketogenic diet may enhance the body’s ability to clear these harmful materials.
The review also summarized evidence from human studies. Some patients with Alzheimer’s disease experienced improvements in memory and daily functioning.
People with Parkinson’s disease often reported more energy, reduced fatigue, and better movement control. Similar positive findings have been observed in some studies involving ALS and multiple sclerosis.
However, the researchers stressed that the ketogenic diet is not a cure. Many people find it difficult to maintain because it requires strict limits on carbohydrate-rich foods. Some participants in studies stop following the diet because they find it too restrictive. Others experience temporary side effects when starting the diet.
The authors also emphasize that most of the strongest evidence still comes from animal studies rather than large human clinical trials. As a result, important questions remain unanswered.
Scientists still need to determine the long-term safety of the diet, identify which patients are most likely to benefit, and understand whether benefits can be sustained over many years.
If you care about Alzheimer’s, please read studies about Vitamin D deficiency linked to Alzheimer’s, vascular dementia, and Oral cannabis extract may help reduce Alzheimer’s symptoms.
For more information about brain health, please see recent studies about Vitamin B9 deficiency linked to higher dementia risk, and results showing flavonoid-rich foods could improve survival in Parkinson’s disease.
Source: Translational Neurodegeneration review.
