Nour Mansour, a 28-year-old mother, was initially delighted by the effects of Mounjaro,which helped her lose over three stone in less than seven months after struggling with her weight since the birth of her twin daughters. The rapid weight loss significantly boosted her confidence. However, after six months into her weight loss journey, Nour began to experience a distressing side effect: alarming hair shedding. Her once full, hip-length hair started coming out in clumps, transforming from glossy and thick to dry and frizzy, with noticeable thinning at the temples, prompting her to constantly wear caps and headbands.

Hair thinning or shedding is a common reported side effect among women undergoing rapid weight loss or experiencing hormonal changes while on medications like Mounjaro. However, medical experts emphasize that the medication itself is not the direct cause of the problem. Dr. David Fenton, a consultant dermatologist and renowned hair loss specialist, explains that rapid weight loss or sudden dietary shifts can lead to deficiencies in essential nutrients vital for healthy hair growth. These include iron, vitamin B12, folate, zinc, and vitamin D. When individuals lose their appetite and reduce food intake, they risk missing out on these crucial vitamins. A lack of protein is also a significant factor, as hair is primarily composed of keratin, a tough, fibrous protein. Insufficient protein intake can make hair weak and brittle.

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Similar deficiencies have also been linked to other side effects observed in GLP-1 users, such as brittle fingernails and slowed nail growth.Dr. David Strain, a diabetes expert, points out that while participants in clinical trials are carefully monitored and maintained on nutrient-rich diets, many real-world users lack the knowledge to meet their nutritional needs or identify necessary supplements for optimal health.

Dr. Fenton further elaborated on the biological mechanism behind this type of hair loss. Normally, approximately 90 percent of hair follicles are in a growth phase, while 10 percent are resting. However, when the body experiences stress, whether from illness or significant weight loss, this cycle is disrupted, leading a higher percentage of follicles to prematurely enter the shedding phase. He notes that the more weight lost, and the faster it is lost, the higher the risk of this condition. This phenomenon, similar to postpartum hair loss in women, is medically termed telogen effluvium and typically resolves on its own over time.

Fortunately, there are actionable steps that can help minimize damage and encourage recovery. Slowing down the rate of weight loss can significantly reduce the physiological stress on the body. Dr. Fenton advises that anyone concerned about hair loss should consider undergoing a blood test, especially if they follow a vegan or vegetarian diet. To boost iron levels, increasing intake of red meat, dark leafy greens (like kale and spinach), nuts, and seafood is recommended. Good sources of zinc include dairy products such as yogurt and kefir, eggs, and wholegrains. Vitamin B12, predominantly found in animal products, is also widely available in supplement form.

Nour Mansour’s experience mirrored these recommendations and their positive outcomes. After consulting her GP, she began taking supplements and prioritizing a healthy diet. Following these changes, her alarming hair shedding successfully ceased, demonstrating the importance of nutritional balance during periods of significant physical change.