Not every fast is healing… some can quietly unravel the very systems you’re trying to repair. In recent years, fasting has become a buzzword in wellness circles. From 16:8 protocols to extended water fasts, it’s hard to scroll through social media without being met with bold promises of fat loss, detoxification, and mental clarity. And while fasting can offer profound healing and renewal, as we’ve come to know, it is not without risk.
Behind the glossy “before and after” photos lies a much more complex picture. When approached without proper understanding or support, fasting can trigger emotional distress, physiological imbalances, or even amplify unresolved health issues. This is why it’s essential to approach fasting with discernment and, ideally, under the guidance of a qualified practitioner who understands both the physiological and emotional aspects of the process.
When fasting becomes harmful
Many people turn to fasting out of desperation. They feel bloated, anxious, burnt out, or chronically unwell, and they’re looking for something that will reset them. In the right context, fasting can be that reset. But without proper support, it can just as easily become another form of self-punishment or escapism.
1. Retraumatising the nervous system
For those with a history of trauma, be it childhood neglect, grief, abuse, or chronic stress, the body often holds protective patterns: emotionally, metabolically, and physically. Fasting can bring these patterns to the surface, sometimes more quickly than the nervous system is ready to handle. The body may interpret the absence of food not as healing, but as another threat.
One example that illustrates the importance of emotional readiness comes from a woman who attempted a 15-day water fast on her own. Although the fast itself wasn’t unsafe, it stirred unresolved emotions she wasn’t equipped to process. The result was a wave of anxiety and overwhelm that left her feeling destabilised. With the right emotional framework and support in place, these kinds of experiences can be integrated more gently, without triggering retraumatisation.
2. Fuelling disordered eating
Fasting is not a diet, it is a therapeutic intervention rooted in ancient practice and modern science. Yet for some, particularly those with a history of disordered eating, such as bulimia, bingeing, or orthorexia, fasting can become another tool of control. Skipping meals may feel like empowerment, but it can also be a socially accepted way of avoiding emotional discomfort or managing body image anxiety.
Fasting requires deep self-awareness and an honest exploration of intent. It’s not about how long you can go without food; it’s about why you’re choosing to fast. Is the choice driven by healing or by fear? That distinction is everything.
When done consciously and with proper guidance, fasting can reconnect people to their bodies rather than push them further away. But that level of healing requires context, care, and often collaboration with mental health professionals.
Emerging physical risks: what’s not always talked about
As fasting becomes more popular, we’re also seeing a rise in lesser-known side effects that deserve attention:
Slower hair regrowth
Some individuals, especially after over-fasting or calorie-restrictive cycles, report slowed hair regrowth or even temporary shedding. This isn’t necessarily a sign of damage but a reflection of the body reallocating resources. When fasting, the body prioritises vital functions, and hair growth isn’t at the top of that list. With time, nourishment, and proper refeeding, this often resolves, but it highlights the importance of not pushing too far, too fast.
Gallstones
Over-fasting or very low-calorie diets can increase the risk of gallstone formation, particularly in those predisposed. Without regular fat intake to stimulate the gallbladder, bile can stagnate and crystallise. It’s not a reason to avoid fasting altogether, but another reason to work with someone who understands how to structure fasts safely, especially if you have a history of gallbladder issues.
Refeeding syndrome
Rare but serious, refeeding syndrome occurs when food is reintroduced too quickly after a prolonged fast, especially one lasting several days. It can cause dangerous shifts in electrolytes and fluid balance. For this reason, longer fasts should always be followed by a structured, gradual refeeding phase, guided by someone who understands the biochemistry involved.
Medical screening and contraindications
People with diabetes, cardiovascular issues, electrolyte imbalances, pregnancy, or breastfeeding should consult healthcare providers before fasting. Personal medical screening is critical to identify contraindications and tailor safe fasting plans.
The future is personalised health
We are moving out of a one-size-fits-all era. Whether we’re talking about fasting, nutrition, or supplementation, personalisation is no longer a luxury; it’s essential.
Each of us has a unique metabolic blueprint. We carry different histories of trauma, stress, and illness. We process food, emotions, and information differently. Trying to follow the same protocol as someone you saw on Instagram is like borrowing their prescription glasses. It might work for a moment, but eventually, it will blur your vision.
Personalised fasting is about alignment, not achievement. It considers your age, hormone profile, stress load, sleep quality, menstrual cycle (if applicable), medications, emotional readiness, and more. Fasting in your twenties is not the same as fasting in perimenopause. Fasting after burnout recovery looks different from fasting after trauma.
Two stories of collaborative healing
Some of the most remarkable shifts I’ve witnessed have come when fasting is part of a broader, supported journey, rather than a quick fix.
Client story 1: From antidepressants to autonomy
Sarah* had been on antidepressants for years. They helped her function, but she felt emotionally numb and physically flat. She had gained weight, struggled with energy dips, and no longer recognised herself. She had done years of talk therapy but still felt disconnected from her body.
With support from her therapist and medical provider, we introduced gentle fasting protocols. We focused on stabilising her blood sugar, restoring circadian rhythm, and supporting liver detox pathways. Over time, three months of consistent, compassionate work, Sarah began to taper off her medication (under supervision). She felt her emotional range return, along with energy, clarity, and connection.
Fasting wasn’t the “cure”, it was the catalyst that gave her body space to reset, and her soul permission to feel again.
Client story 2: Releasing generational trauma
Mark* had done it all. EMDR, CBT, breathwork, somatic therapy. But his body still felt locked. He held deep grief and trauma from childhood into adulthood. His nervous system was always braced for impact.
We started small: 12-hour fasts paired with somatic grounding, breathwork, and support from his trauma-informed therapist. During a guided 5-day dry fast, something shifted. It was unknown to him that he was emotionally releasing, yet he could feel it physically in his body during the fast. The body was releasing years of stored emotional toxins.
After the fast, he described it as “finally exiting survival mode.”
Today, Mark continues to fast periodically, and always with emotional awareness. He’s not chasing a healing state anymore, he’s inhabiting one.
(*Names changed to protect privacy.)
Your body is the expert, not social media
The online world is full of fasting “rules”:
• Don’t eat before noon.
• Only black coffee counts.
• Do 72 hours for autophagy.
But real healing doesn’t follow formulas. Your body is the expert. It speaks in cravings, in fatigue, in skin flares and sleep disruption. Learning to listen to these cues and responding with respect is the foundation of safe fasting.
Ask yourself:
“Am I fasting because my body is ready?”
“Or because someone online said I should?”
Fasting isn’t about restriction. It’s about recalibration.
Signs you need more support
Before starting any fasting protocol, it’s worth reflecting on the following red flags. If any of these apply, professional guidance is strongly recommended:
- A history of disordered eating (even if mild or “under control”)
- Unresolved past or ongoing trauma
- Medications, especially psychiatric, hormonal, or blood pressure-related
- Autoimmune or thyroid conditions
- Symptoms like dizziness, anxiety, or severe fatigue
- Motivation driven by fear, shame, or body control
Fasting can touch every system in the body, metabolic, emotional, hormonal, and neurological. A skilled practitioner can help you interpret your responses, adjust protocols, and pause when necessary. I always encourage clients to work alongside a therapist or doctor where appropriate. True healing is collaborative.
In conclusion, healing requires safety
Before you start your next fast, get clear on your intention. “What am I fasting from, and what am I truly seeking to heal?” Clarify your “why?”.
This is why working with a qualified practitioner, ideally in conjunction with a therapist or healthcare provider, isn’t just helpful, it’s essential. Your physical, emotional, and psychological readiness matter.
Fasting can absolutely be powerful. I’ve seen it improve insulin sensitivity, balance hormones, restore vitality, and support emotional release. But those outcomes are never the result of willpower alone or following a trend on social media.
They happen when the body feels safe enough to let go.
They happen when we approach fasting not with force, but with curiosity.
They happen when we stop chasing someone else’s timeline and begin honouring our own.
Because the future of healing isn’t one-size-fits-all. It’s personalised. It’s informed. And it’s done in partnership with your body, not at war with it.