The way I think about hair loss is in layers The Internal Drivers of Hair Loss Hair follicles are incredibly sensitive to what's happening inside the body. Hair growth isn't always prioritized when nutrients and energy are needed elsewhere. Some of the most common drivers include hormone shifts, thyroid dysfunction, iron deficiency, insulin resistance, chronic stress and elevated cortisol, autoimmune activity, and nutrient deficiencies. When any of these systems are out of balance, the...

When the nervous system takes the lead Hair loss doesn't only respond to hormones and nutrients — it also responds to how safe your body feels. Your nervous system is constantly gathering information about your environment — stress, sleep, trauma, illness, overwork — and deciding where energy should go. When the body perceives threat or overload, hair growth quickly moves down the priority list. What many people don't realize: stress isn't only something you feel emotionally. The brain also...

Why the health of your digestive system shows up in your hair Last week we explored how stress and the nervous system influence hair shedding. But stress doesn't stop at cortisol — chronic stress alters the gut barrier, shifts the microbiome, and increases systemic inflammation, all of which directly impact the scalp and hair growth cycle. If hair reflects internal health, the gut is often where the story begins. The Gut–Hair Connection Digestion isn't just about breaking down food — it's the...