I am in my late thirties. The hair is gone. Or at least the thickness is. Photos from right after college show a girl with curls thick enough to hide in. That woman is a memory now. Shedding started for no obvious reason. Growth slowed down too. It felt like losing a battle I didn’t even know I was fighting.
I bought the solutions. The fancy shampoos promising fullness. The vitamins promising growth. I took one brand for a whole year. Nothing changed. My nails did get strong enough to dig trenches, though.
So I quit trying to fix hair. Instead, I fixed my diet for running. I’m an endurance athlete. I do half-marathons. A full marathon. I needed protein to build muscle. To recover. To stop injury.
A few months in, something weird happened. The shower drain wasn’t clogging anymore. The hair felt thicker.
Coincidence?
Dr. Hannah Kopelman thinks not. She’s a dermatologist in NYC who sees this often. There is evidence. A 2021 review linked low protein directly to telogen effluvium. That is the fancy name for sudden, shocking shedding. It happens when your body is starving for amino acids.
“While we still need larger controlled trials… this is consistent with what I observe in my practicing,” Dr. Kopelman said.
The Biology of Thinness
Hair isn’t magic. It is a structural protein. Specifically, keratin. Almost 100% of a hair shaft is made of this stuff. Vanessa Rissetto explains this best. She’s a dietician who runs Culina Health. Without protein, your body shuts down non-essential production.
Your kidneys are essential. Your lungs are essential. Your hair? Not so much.
When protein intake dips, the body sends keratin production to the back of the line. The growth phase (anagen ) gets shorter. The shedding phase (telogen ) kicks in early. You end up with weaker strands. Slower growth. More clumps in your hand when you tie it back.
This is also why those pills failed. A multivitamin doesn’t replace structural material. It fills gaps. But if the foundation is missing, the building falls down. Dr. Kopelman points out that many supplements just give you biotin. Biotin helps nails. Nails grow fast. They react to nutrition quickly. Hair is complex. Hormonal. Genetic. It takes longer. It listens less.
How to Actually Fix It
I didn’t need a magic pill. I just needed a plan.
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Calculate the target.
Most people aim for 0.8g of protein per kilo of body weight. I run marathons. I needed 1.2 to 1.6g. For me? Roughly 100 grams a day. Do the math. -
Find the gaps.
Dinner is usually salmon. Rice. Easy. The problem was breakfast. Snacks. I swapped oatmeal for a chicken sausage burrito. Greek yogurt with pumpkin seeds. Dried meat sticks when I’m out running. -
Cheat a little.
I drink protein shakes. Pre-made. Thirty grams a pop. It works for quick hits. Dr. Kopelman approves, sort of. Whole foods give you zinc. Iron. Healthy fats. But whey or plant powder provides the amino acids your follicles crave. It’s fine if whole food isn’t an option right then. -
Try collagen.
A 2024 study suggested collagen peptides might help too. Worth a shot if you are already hitting protein targets but still seeing fallout.
The Uncomfortable Truth
Hair health mirrors general health. Sleep. Stress. Diet. If those are messy, your scalp reflects it.
But don’t rush out and buy a gallon of egg whites yet. This only works if you are under-consuming. If you already eat enough protein and are still shedding? Look deeper.
Hormones. Stress. Autoimmune issues. Genetics. These don’t care about your dinner plate.
Dr. Kopelman says to track your food first. Just a few days. Look for other signs. Brittle nails. Fatigue. Slow-healing cuts. Those are the real markers of protein deficit.
Wait.
Hair grows 1 to 1.5 cm a month. It will take three months to see a difference. Maybe six.
If the hair falls out in patches? Go to a doctor. This isn’t a food issue.
It isn’t about returning to college photos. The goal isn’t nostalgia. It’s function. It’s feeling less hair on your brush. That feels pretty good, actually.
