Experts caution that rapid weight loss from popular GLP-1 medications like Ozempic and Wegovy may deprive the brain of essential nutrients, potentially leading to detrimental effects on brain health.
As the popularity of GLP-1 weight-loss medications such as Ozempic and Wegovy continues to rise, health experts are raising concerns about the potential risks associated with rapid weight loss and severe caloric restriction. Dr. Tommy Wood, a professor of pediatrics and neuroscience at the University of Washington, warns that these medications could deprive the brain of vital energy and nutrients necessary for its proper functioning.
Dr. Wood explained that the impact of these drugs on brain health is closely linked to the body’s energy availability during weight loss. “The best way to think about this is the spectrum of what we call energy availability,” he stated during an interview with Fox News Digital at Strong NY, New York City’s largest annual fitness and wellness festival. “The brain is your most energy-hungry organ in the body.”
According to Dr. Wood, brain reserve—the physical amount and integrity of brain tissue—follows a bell-shaped curve in relation to the body’s energy availability. Excess energy, often resulting from obesity, high blood sugar, and metabolic disorders, can diminish the brain’s resilience by damaging blood vessels and contributing to insulin resistance. In these cases, GLP-1 medications may offer cognitive benefits by lowering blood pressure and improving blood sugar control.
However, Dr. Wood cautioned that the lower end of the energy spectrum presents its own risks to brain structure. The brain, which relies heavily on a continuous supply of fuel, may resort to consuming its own tissue during periods of extreme caloric deficit. He referenced a study involving marathon runners, noting that their brains experienced a reduction in white matter due to the intense energy demands of the race. “The brain didn’t have enough energy, so it was eating its own white matter,” he explained, adding that the participants’ brains recovered after resting and refueling.
This phenomenon underscores the brain’s significant energy requirements and its tendency to decrease in size when deprived of adequate energy. Dr. Wood also addressed concerns regarding lean muscle loss associated with GLP-1 medications, stating that some of the initial “lean mass” lost is actually fat that had accumulated within the muscles. “So technically, your muscles get smaller, but you don’t get weaker,” he clarified. “And the quality and functioning of your muscles actually gets better.”
Despite these nuances, risks can arise when individuals using GLP-1 medications drastically reduce their food intake over extended periods. Chronic under-eating can lead to a deficiency of essential structural nutrients for the central nervous system. “It is possible that you can end up going too far,” Dr. Wood warned. “If you’re not eating enough, you’re not getting the nutrients that are critical for the brain. So you’re not getting in enough omega-3 fats, which we know are really important. You’re not getting enough iron and protein and all those kinds of things.”
To protect brain health while pursuing weight loss, Dr. Wood recommends incorporating resistance training into weight-loss regimens at least twice a week. This approach helps maintain functional muscle mass and stimulates the production of brain growth factors. Additionally, ensuring an adequate intake of core “neuro-nutrients,” such as B vitamins (B12, folate, B6), vitamin D, iron, and omega-3 fatty acids, is crucial for preventing long-term cognitive impairment.
“For most people, I think it’s going to be beneficial to start, but you just need to make sure that you don’t push it too far, that you’re now getting enough of everything that the brain needs,” Dr. Wood advised.
As the conversation around GLP-1 medications and weight loss continues, it is essential for individuals to remain mindful of their nutritional intake and overall health, ensuring that their weight-loss strategies do not compromise their brain health.
According to Fox News, the insights shared by Dr. Wood highlight the importance of balancing weight loss with nutritional needs to safeguard cognitive function.