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Reviewed by Kristin Hall, FNP
Written by Our Editorial Team
Weight loss can severely improve your health but may have unexpected side effects. Along with having to buy new clothes and field questions from acquaintances about “how you did it,” you might experience physical side effects, like loose skin, feeling cold or even hair loss with weight loss.
Rest assured, you shouldn’t lose hair after dropping a pants size or two.
Hair loss with weight loss is usually seen in people who shed significant weight or have a nutritional deficiency. The latter means you lack certain vitamins and nutrients, a potential effect of extreme dieting (looking at you, crash diets) or severely restricting calories.
Read on to learn more about the connection between hair loss and weight loss. We’ll also go over what you can do to prevent or treat hair loss from weight loss.
If you’ve ever experienced rapid hair loss, you know how disorienting it is to see your hair swirling in the shower drain or find clumps in your comb.
Though weight loss is often associated with increased self-esteem, it may have the opposite effect if you lose your hair. Consider hair loss from weight loss a marquee sign for the body: If you’re seeing it, there’s a good chance something’s going on inside.
You probably wouldn’t consider weight loss particularly stressful. Still, it can be a taxing event on the body — the American Academy of Dermatology specifically mentions losing 20 pounds as a stressor that can cause hair loss.
Hair loss from weight loss can happen for a few reasons, and there are several causes of male hair loss.
Male pattern baldness is usually due to a mix of genetic factors and your body’s production of male sex hormones, specifically DHT (dihydrotestosterone), a by-product of testosterone. While every guy produces at least some DHT, some people are more sensitive to its effects than others.
It can also happen because of a nutritional deficiency. And some men experience telogen effluvium, temporary hair loss caused by external factors like illness or certain hairstyles.
If you’ve recently lost a significant amount of weight and are noticing more hair on your pillow, know that hair loss with weight loss is possible. But the good news is it’s usually reversible.
If you skip that third slice of pizza or have a salad instead of a burger, your hair probably isn’t going anywhere because of what you’re eating (or not eating, rather). But there is a link between diet and hair loss.
One study looked at 35 patients with female pattern hair loss. Low hemoglobin levels were observed in about 30 percent of participants, and low serum ferritin levels were found in just over 82 percent of cases.
Both hemoglobin and serum ferritin are associated with iron, and iron deficiency is sometimes associated with hair loss. That said, other studies point out that there’s no clear-cut evidence in existing medical literature linking iron deficiency to nonscarring alopecia).
Taking dieting or calorie restriction to extremes? A 2017 study showed that nutritional deficiency could impact hair structure and growth.
The study also showed that having a deficiency in any of the following can cause hair loss:
But why does nutritional deficiency cause hair loss? Thought you’d never ask.
While it may not get your heart rate up or make you short of breath, growing hair actually takes a lot of energy, as hair follicle cells are the most rapidly dividing cells in the body. If you don’t get enough micronutrients from food, your body doesn’t have the fuel it needs to grow hair.
You’ve probably heard obesity referred to as an “epidemic,” which sounds dramatic. Still, research shows that if current trends continue, roughly 38 percent of adults will be overweight by 2030, and another 20 percent will be obese.
No numbers need to be crunched to know that’s a whole lot of people. Obesity comes with a slew of health risks, including type 2 diabetes, high blood pressure, cardiovascular disease and stroke.
For some obese people, bariatric surgery (which includes procedures like gastric bypass and sleeve gastrectomy surgeries) is necessary for losing weight and reducing the risk of certain health conditions.
It makes sense that shrinking the stomach to the size of a golf ball would make it tough to get all the nutrients you need. Hair loss after bariatric surgery can sometimes be caused by nutritional deficiencies, including a lack of protein (more on that later).
One systematic review of research found that about 57 percent of people experienced hair loss after bariatric surgery.
We’ll get back to bariatric surgery and hair loss in a second, but first, a quick interruption to recap the hair cycle (we promise this is relevant). The growth cycle of a hair follicle is divided into three stages: anagen (growth), catagen (transition) and telogen (rest).
Temporary hair loss can be caused by stress, illness, hormonal changes or medications. When it comes time for the hair to grow again, usually a few months after the stressful event, all the hairs that were resting will shed at once, causing noticeable (and sometimes alarming) hair loss.
So hair loss from bariatric surgery isn’t just about nutrition — it may also be telogen effluvium.
Certain medical conditions and illnesses can cause hair loss in some people.
Alopecia areata is an autoimmune disease that occurs when the immune system attacks hair follicles in the growth phase, sending them prematurely into the resting phase of the hair growth cycle.
Autoimmune disorders that affect the thyroid (like Hashimoto’s and Graves) commonly cause hair loss. This tracks, as thyroid hormones are essential for the health of hair follicles. Antithyroid drugs can also cause hair loss.
Anorexia hair loss can be from nutritional deficiencies or extreme weight loss.
Hair is primarily made up of protein. So adequate protein intake is essential for hair growth. Low protein intake (or protein deficiency) may lead to hair changes, including hair thinning and hair loss.
Research shows that high-protein diets can deliver 15 to 20 percent greater weight loss than lower-protein diets. Why? They keep you feeling full longer while preserving lean body mass.
Now for some good news: Weight loss hair loss is usually not permanent and will stop once you address the underlying cause.
Though excessive weight loss can be dangerous, hair loss itself is not necessarily a health concern.
Telogen effluvium is a type of nonscarring, temporary alopecia triggered by certain life events and changes in your physical or psychological health.
As many as 95 percent of all cases of acute telogen effluvium go into remission. So once your stress levels calm down (one more reason to finally try that yoga class) or you address the nutritional deficiency, you should notice hair regrowth.
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“When I show my barber my progress, he is always in disbelief. I have to recommend Hims to any guy who’s experiencing thinning.”
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“4-months strong and my confidence boosted back up to 100% using Hims, future me really does thank me.”
“I’m a 34-year-old father of two and have been using Hims for over a year now. My hair is back to what it was in my mid-twenties.”
There’s a big difference between hair loss and hair shedding. The American Academy of Dermatology says it’s normal to lose 50 to 100 hairs each day.
If you’re losing more than that or notice diffuse thinning or patches of hair loss, it’s most likely male pattern hair loss. In rare cases, it could be hair loss from weight loss.
Here are proven ways to prevent and slow hair loss from weight loss or other causes:
Finasteride (the active ingredient in Propecia®) is proven to slow hair loss and stimulate hair growth. Studies show this medication can reduce the amount of dihydrotestosterone (DHT, a male sex hormone that messes with the hair follicles so they can’t produce new hair) in the body by more than 90 percent.
Two’s a party when it comes to our topical finasteride & minoxidil spray. The spray is easy to use and combines two powerful ingredients (finasteride and minoxidil). Finasteride blocks DHT, and minoxidil is a vasodilator, meaning it brings blood to the scalp.
Generic for Rogaine®, this FDA-approved over-the-counter version of topical minoxidil is used for regrowth on the crown of the head.
This is the FDA-approved dynamic duo. When used together, men saw better results in clinical trials compared to using either alone.
If you’re looking for something effective but don’t want too many steps in your routine, this once-a-day pill could be right for you.
Clinically proven to regrow hair in 3-6 months, no pills required.
Here’s the long and short of it (the article, not your hair).
Dropping a couple of pounds to fit into the suit you need to wear to a wedding next month isn’t going to make your hair fall out. However, in certain situations like crash diets or illnesses, weight loss can cause hair loss.
Hair loss from weight loss is typically temporary and often spurred by a stressful event, such as quickly losing 20 or more pounds.
Hair loss treatments can help get your hair back on track.
Check out these tips for making hair grow faster if you’re trying to speed up the growth process after temporary hair loss from weight loss.
Hims offers various hair loss treatments for men — and you can access them online following a consultation with a healthcare provider. Explore your options today.