Intermittent fasting (IF) is a popular dietary approach known for benefits such as weight loss, improved insulin sensitivity, and reduced inflammation. However, recent research suggests that IF may have unintended effects on hair growth by impairing hair follicle regeneration.
Impact of IF on Hair Growth
A study published in Cell examined how IF affects hair follicle stem cells (HFSCs), which are responsible for new hair production. Researchers found that fasting causes a metabolic shift in the body, prioritizing energy conservation over hair regeneration. This shift increases free fatty acids near hair follicles, leading to the death of HFSCs instead of promoting new growth. Mice on unrestricted diets regrew their hair in about 30 days, while those on time-restricted eating schedules showed delayed regrowth, taking over 96 days for partial regrowth. In a similar human study, participants who ate within an 8-hour window experienced 18% slower hair regrowth compared to those with no eating restrictions.
What Does This Mean for Humans?
More research is needed, but those worried about hair loss should be cautious with IF. It’s advisable to consult a healthcare professional, especially for individuals already experiencing thinning hair.
Despite potential drawbacks for hair growth, IF remains beneficial for many aspects of health. To minimize risks, individuals should focus on proper nutrition during eating windows and consider the duration and intensity of fasting. Antioxidants like vitamin E may also help mitigate the effects of oxidative stress on hair follicles.
While IF offers various health benefits, its effects on hair growth should be considered carefully. If hair health is a concern, it’s important to seek personalized medical advice before beginning an IF regimen.
