One of the most upsetting and unintended effects during fasting is hair loss. It can show up suddenly as extra strands in the shower drain, hair all over the brush, or noticing more of your scalp or a more visible parting in your hair, and it can be alarming.
The good news is that fasting itself does not automatically cause permanent hair loss.
Why hair loss happens during fasting
Hair loss is sometimes the body’s way of waving a red flag.
In most cases the shedding is temporary, and linked to physical stress, nutrition deficiencies, or simply not eating enough overall. This is why extreme dieting, illness, surgery, emotional stress, and rapid weight loss can all trigger hair loss, not just fasting.
When the body feels stressed, it begins prioritising essential survival functions over things it considers less necessary. Unfortunately, maintaining thick, healthy hair is not high on the priority list.
Several factors can contribute to hair loss during fasting, including:
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Rapid weight loss
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Severe calorie restriction
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Chronic stress
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Low protein intake
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Nutrient deficiencies
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Over-fasting without adequate recovery
Why the hair loss can seem so sudden
At any given time, some hairs are actively growing while others are resting before they naturally shed. When the body experiences stress (and fasting is a stress, even if it’s beneficial), a large number of hairs can suddenly shift into the shedding phase at the same time. This condition is often called telogen effluvium.
One confusing part of this process is that hair loss usually does not happen immediately. Many people notice it two or three months after the stressful event began. That is why someone could start fasting in January and suddenly notice hair loss in March.
Nutrients your hair needs
We know that fasting is largely about when you eat, but what you eat still matters enormously.
Hair is made primarily of protein, so when protein intake drops too low, the body may reduce hair growth. Iron also plays a major role, especially for women, and low iron levels are strongly associated with hair loss.
Other nutrients that support healthy hair growth include:
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Zinc
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Healthy fats
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Biotin
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B vitamins
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Vitamin D
This does not necessarily mean everyone needs supplements. However, it does mean your meals should be nutrient-dense and well-balanced during eating windows.
Someone eating adequate protein, healthy fats, and mineral-rich foods during eating periods may experience no hair issues at all.
How to protect your hair while fasting
The goal is not to avoid fasting completely. You still want all the amazing benefits of fasting. But there are things you can do to minimize hair loss.
Aim for nutrition when you eat
Prioritize healthy fats and protein during eating periods. This is one of the biggest factors in maintaining hair health. Choose whole, nutrient-dense foods.
Don’t restrict calories
When you’re not fasting, you should eat till satisfied and never restrict calories when your body is asking for more.
Supplement
Because most people just don’t meet daily vitamin and mineral requirements, even if they’re not fasting, a supplement can help fill the gaps. Our Hair Defence provides a mega-strong dosage of Biotin as well as other key vitamins, and is specifically designed to help prevent hair loss during your fast.
Consider gentler fasting schedules
Extended Fasting is great, but it doesn’t work for everyone. If you notice an issue with hair loss during Extended Fasts, switch to Intermittent Fasting, like a 19/5 schedule, for example.
And if you do choose to go with Extended Fasting, always prioritise quality refeeding periods between Extended Fasts, and take a break every once in a while.
Final thoughts
Hair loss during fasting can feel frightening. But in most cases it is only temporary, and often comes back even healthier and fuller than before.
