A respected gastroenterologist has raised concerns about one of the most popular eating plans out there today. Dr. Andrew Moore explains that while many people turn to the keto diet for quick weight loss and other benefits, he personally would not stick with it over the long haul unless a doctor was closely monitoring the process. The approach has gained a huge following because it promises fast results by shifting how the body fuels itself. Yet the specialist stresses that what works short-term can create problems when followed for months or years without guidance.
The keto diet works by sharply cutting carbohydrates, often to 50 grams or less per day. In their place, people eat moderate amounts of protein and load up on fats. This change pushes the body into ketosis, a state where it starts burning stored fat for energy instead of relying on glucose from carbs. Many followers report losing pounds rapidly and feeling more energized at first. Dr. Moore acknowledges these upsides but points out a hidden downside that affects the gut.
One major issue lies in the way this eating style impacts fiber intake. Plenty of the best sources of dietary fiber, such as fruits, vegetables, legumes, and whole grains, also carry significant carbs. When those foods are restricted, fiber consumption often drops well below recommended levels. Experts generally suggest aiming for 25 to 38 grams of fiber daily, depending on age and gender. Falling short deprives the gut microbiome of the fuel it needs to thrive.
Fiber plays a starring role in digestive health because gut bacteria break it down into short-chain fatty acids. Those compounds help reduce inflammation, strengthen the intestinal lining, and keep harmful bacteria in check. Without enough fiber over time, the balance of the microbiome can shift in unhealthy ways. Dr. Moore warns that this disruption raises the risk for conditions like inflammatory bowel diseases and even colorectal cancer.
He makes it clear that the keto diet does not ban fiber outright. The limitation comes indirectly from avoiding carb-heavy plant foods that naturally deliver fiber. Some people try to boost fiber on keto with low-carb options like certain vegetables or supplements, but making big jumps too quickly can lead to discomfort such as bloating and pain. The doctor advises adding fiber gradually and drinking plenty of water to ease the transition if someone chooses that route.
For sustained gut health, Dr. Moore leans toward patterns like the Mediterranean diet. That approach includes generous portions of fruits, vegetables, lean proteins, and whole grains, all of which support a diverse and resilient microbiome. It provides steady fiber without the extreme carb cuts that define keto. While keto can be useful for specific medical needs under supervision, he sees broader, plant-rich eating as a safer everyday choice for most people.
The specialist’s view serves as a reminder that trendy diets often come with trade-offs. Popular plans can deliver impressive short-term wins, but long-term effects on the body, especially the gut, deserve careful thought. Consulting a healthcare professional becomes essential before diving in deeply.
What are your experiences with the keto diet or other low-carb approaches, and how has your gut health been affected? Share your thoughts in the comments.
