Written by Jillian Kubala, MS, RD on February 22, 2021 — median reviewed by Alissa Palladino, MS, RDN, LD, CPT, Nutrition, personal Training

In part cases, load loss deserve to lead to side effects, consisting of hair loss.

Your body is sensitive to nutrient deficiencies, stress, and also hormonal alters — every one of which can occur as a result of fast weight loss, limit diets, or load loss surgery.

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This post explains why some civilization experience hair lose after load loss and also discusses methods to treat and also prevent the issue.

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Hair loss during weight loss is commonly caused through nutrient deficiencies and other effects sudden and rapid load loss can have on your body.

For example, sudden load loss and restrictive diets have been connected to a problem known as acute telogen effluvium (TE), among the most common causes of prevalent hair loss on the scalp (1, 2).

Typically, dare occurs approximately 3 month after a triggering event like quick weight loss and also lasts around 6 months.

Weight loss and nutrient deficiencies associated with restrictive diets are also linked come other varieties of hair loss. These include chronic TE, which lasts much longer than 6 months, and also androgenic alopecia, additionally known together male or female pattern baldness (3).

Here space some causes of hair loss pertained to diet and also weight loss.

Crash dieting

The link between crash dieting and also hair loss has actually been recorded in research study as far back as the 1970s (4).

Your hair needs adequate calories and also nutrients to thrive properly. So, as soon as your human body doesn’t obtain what the needs, side results like hair loss can occur.

Many researches have linked hair ns to quick weight loss, calorie restriction, nutrient deficiencies, and psychological stress — all typically in world who are following crash diets.

For example, a 2015 research in 180 women v diffuse hair loss discovered that the many common reasons of hair loss were iron deficiency and also psychological stress. In eight that the cases, crash diets to be the cause (5).

Poorly plan diets, such together crash diets, deserve to lead come deficiencies in important fatty acids, zinc, protein, and overall calories, all of which have the right to lead come hair loss (1).

Very low protein diet

Amino acids, the building blocks the protein, are vital for hair growth. That’s since amino acids are essential for the manufacturing of keratin, the main structural protein the hair.

Protein malnutrition — once your human body doesn’t get enough protein — can result in hair loss. Thus, if you’re following a low calorie weight loss diet that doesn’t contain enough protein, you might experience hair loss as a result (1).

When her protein needs aren’t met, your body prioritizes necessary protein-dependent features like organization repair, digestion, pH and also water balance regulation, and also hormone production. Because hair expansion isn’t necessary to store you alive, hair lose may occur (6).

Additionally, deficiencies in specific amino acids, such as histidine, leucine, valine, and also cysteine, are usual in world with hair loss.

In a research in 100 civilization with hair loss, researchers observed histidine and also leucine deficiencies in huge percentages the participants across several types of alopecia, including androgenic alopecia and also TE (7).

The study additionally found that valine and also cysteine deficiencies to be common amongst the participants (7).

Weight ns surgeries

Weight loss surgery is connected with quick weight loss and commonly causes deficiencies in protein, vitamins, and/or minerals, which in turn can spark hair loss (8, 9, 10).

For example, a 2018 study that had 50 civilization who underwent sleeve gastrectomy, a operation procedure that clears a big portion the the stomach, it was observed hair ns in 56% the the participants. Hair loss was an ext common in females (9).

Notably, the participants v hair loss had much lower levels that zinc and also vitamin B12 both before and after surgical treatment (9).

In a 2020 examine in 112 ladies who had undergone sleeve gastrectomy, 72% that participants proficient hair lose after surgery. In 79% that those that reported hair loss, the loss began 3–4 month after surgery and also lasted an mean of 5.5 month (11).

In addition to reducing stomach capacity, some varieties of weight loss surgery enable food come bypass component of the intestines, leading to malabsorption the nutrients and increasing the danger for deficiencies (12).

Restrictive diets

Just prefer crash diets, restrictive diet that reduced out whole food groups can cause hair loss as a result of nutrient deficiency or stress.

Deficiencies in iron, zinc, protein, selenium, and essential fat acids have all been linked to hair lose (13, 1).

Very low calorie diets have actually been presented to reason hair loss too (6, 14).

Major stress, which sometimes comes together with restrictive dieting, has also been linked to hair ns (15).


Hair loss throughout or after load loss have the right to be caused by nutrient deficiencies, rapid weight loss, and also stress.

Hair lose itself no dangerous, but the underlying causes of hair ns after load loss deserve to be.

For example, nutrient deficiencies and also extreme calorie restriction deserve to lead to severe health after-effects like stole deficiency anemia, muscle loss, and more.

Besides potentially causing hair loss, steel deficiency anemia deserve to lead to impaired mind function, infertility, love conditions, depression, and also altered immune system duty (16).

Calorie and protein limit can likewise cause dangerous side effects, including reduced muscle function, heart problems, minister issues, diminished immune function, and also increased risk of depression (17).

Other clinical conditions, such as autoimmune conditions, can likewise cause hair loss. Therefore, it’s important to talk to a healthcare provider if you’re suffering hair loss, due to the fact that it can not be related to weight loss.


Although hair loss chin is no dangerous, the underlying reasons can be. If you’re enduring hair loss, it’s essential to top your health care provider to dominance out an underlying medical condition.

As mentioned, hair loss during weight loss deserve to be resulted in by nutrient deficiencies or rapid weight loss. Together such, it’s vital that you target to lose weight in a healthy, sustainable manner.

In addition to potentially causing hair loss, crash and restrictive diets can be harmful to psychological health and are connected with weight reclaim (18, 19, 20, 21).

Instead of a fad diet, choose a balanced diet that gives your body v the nutrients it requirements to role optimally. Speak no to restrictive diets that promise rapid weight loss is vital for protecting your physical and also mental health and reducing the threat of side effects like hair loss.

Additionally, if you follow a diet pattern the restricts plenty of foods — such together a vegetarian or vegan diet, which may be short in hair loss-associated nutrients like iron and zinc — make certain to encompass nutrient-dense foods and supplement through nutrients her diet lacks (22, 23, 24).

If undergoing weight loss surgery, ensure that your levels of nutrients prefer zinc, iron, and also vitamin B12 space optimal before the procedure, and also supplement with nutrients encourage by your physician or dietitian afterward. This can help prevent surgery-related hair ns (8, 9).

How come facilitate hair regrowth

If you’re enduring hair loss, it’s crucial that you identify the cause prior to you shot to law it.

Remember, hair loss can have numerous causes, not just rapid load loss or nutrient deficiencies.

If the hair lose is led to by a deficiency in one or much more nutrients choose zinc or iron, correcting the deficiency or deficiencies may stop the loss and lead come hair regrowth (1).

If a limit or crash diet it is not offering your body sufficient calories or nutrients is to blame, it’s important to stop the diet immediately and also begin fueling her body properly with a well balanced diet rich in nutrient-dense foods.

If you have a nutrient deficiency, food alone may not be sufficient to replenish her nutrient stores and a supplement may be necessary. However, research argues that if you don’t have a nutrient deficiency, supplements might not advantage hair loss (1).

A health care provider can identify the cause of her hair loss and help you come up v a plan to get your hair farming again.

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To avoid hair loss, protect against crash and restrictive diets, fuel your body properly, and also supplement before and also after weight loss surgery. Job-related with a qualified healthcare provider to recognize the reason of hair loss and also to uncover a setup to facilitate hair regrowth.