One Week of Fasting Improved Parkinson's Motor Symptoms for a Full Year: What the Research Shows

One Week of Fasting Improved Parkinson's Motor Symptoms for a Full Year: What the Research Shows

Medical disclaimer: This article summarises published research for informational purposes only. It is not medical advice and is not a substitute for guidance from a qualified health professional. Always consult your doctor before starting any fasting protocol, especially if you have an existing health condition or take medication.

Study at a Glance

What This Study Looked At

Researchers wanted to know whether fasting — rather than a specific diet composition — could ease Parkinson's disease symptoms, and whether any benefit would last. This builds on the broader idea that fasting supports autophagy, the cell's internal cleanup process, which researchers increasingly link to brain health. The trial combined a short prolonged fast with a full year of daily time-restricted eating (TRE) to see whether an initial metabolic "reset" could produce symptom improvements that held up over time, rather than fading once normal eating resumed.

Who Was Studied

Participant profile: Adults with a clinical diagnosis of Parkinson's disease recruited through the ExpoBiome project, a multi-year research program studying fasting, the gut microbiome, and immune status in neurodegenerative and inflammatory disease. This was a single-arm study — there was no separate control group eating on a normal schedule for comparison.

How the protocol worked: Participants first completed one week of prolonged fasting, capped at a maximum of roughly 350 kcal per day — closer to a supervised therapeutic fast than a typical eating pattern. Afterward, they transitioned into a 16:8 time-restricted eating routine (an 8-hour daily eating window), which they maintained for 12 months, with symptoms reassessed at intervals across that year.

What the Researchers Found

Motor Symptoms

Following the one-week prolonged fast, researchers recorded a statistically significant improvement in clinician-rated motor symptoms, measured using Part III (the motor examination) of the Movement Disorder Society-Sponsored Unified Parkinson's Disease Rating Scale (MDS-UPDRS) — the standard clinical tool for scoring Parkinson's severity. This motor improvement was reported as sustained across the 12-month time-restricted eating follow-up period, rather than fading once the fasting week ended.

Non-Motor Symptoms

• Non-motor symptoms, measured with the Non-Motor Symptoms Scale (NMSS), also improved significantly after the fasting week.
• Mood measures showed modest improvement alongside the non-motor symptom gains.

Metabolic Changes

• Body mass index (BMI) decreased.
• Systolic blood pressure decreased.

What Did Not Change

• Self-reported experiences of daily living (MDS-UPDRS Part II) did not show a significant improvement.
• Quality of life, measured with the PDQ-39 questionnaire, did not change significantly.
• Sleep measures did not show a significant improvement.

What the Researchers Concluded

The authors concluded that a short period of prolonged fasting, followed by sustained daily time-restricted eating, produced measurable and durable improvements in both motor and non-motor Parkinson's symptoms — suggesting fasting-based interventions may have a role to play alongside standard Parkinson's care, though they stop short of calling it a replacement for medical treatment.

What This Means If You Fast

• This is not a cure, and it isn't a substitute for medication. The study describes symptom improvement, not disease reversal, and participants remained on their standard Parkinson's care throughout.
• The fasting protocol used here was medically intensive. A week at roughly 350 kcal/day is a supervised therapeutic fast, not something to attempt without medical guidance — especially with Parkinson's medications that need to be taken on a schedule and often with food.
• The follow-up eating pattern was ordinary 16:8 TRE, the same 8-hour eating window approach used in many general fasting protocols — the intensive part was strictly limited to the first week.
• Gut health may be part of the mechanism. The ExpoBiome project's broader focus is the relationship between fasting, the gut-brain connection, and immune status in neurodegenerative disease.
• Quality of life and daily function didn't move with symptom scores in this trial — a reminder that a clinician's motor rating and a patient's day-to-day experience don't always shift together.
• Anyone with Parkinson's considering a fasting protocol should do so under a neurologist's supervision, given medication timing requirements and the intensity of the fasting phase used in this trial.

Study Limitations

• Small sample size (n=31) limits how confidently these findings generalize.
• No control group — this was a single-arm study, so some improvement could reflect factors other than fasting itself (attention effects, natural symptom fluctuation, or concurrent care changes).
• Full text of the study was not directly accessible at the time this article was written, so exact effect sizes, statistical values, and participant demographics could not be independently confirmed beyond the indexed abstract.
• Parkinson's disease and its symptoms fluctuate day to day, which can complicate interpreting improvement over a 12-month window.
• As a pilot study tied to a specific research program (ExpoBiome), replication by independent research groups will matter before broader conclusions are drawn.

Source

Hansen, B., Roomp, K., Villette, R., et al. (2025). Fasting Followed by Time-Restricted Eating Leads to Sustained Symptom Improvement in Patients with Parkinson's Disease. Clinical Nutrition ESPEN. View journal abstract →

Frequently Asked Questions

Can fasting help with Parkinson's disease symptoms?

A 2025 pilot study from the University of Luxembourg found that a week of prolonged fasting, followed by a year of daily time-restricted eating, was linked to significant improvements in both motor and non-motor Parkinson's symptoms in 31 patients. It's early-stage evidence from a small, uncontrolled trial, not a proven treatment.

What fasting protocol did the Parkinson's study use?

Participants did one week of prolonged fasting limited to roughly 350 calories per day, then switched to a 16:8 time-restricted eating pattern (an 8-hour daily eating window) for the following 12 months.

Did the benefits last after the fasting week ended?

Yes — the study reported that motor symptom improvements were sustained across the 12-month time-restricted eating follow-up, rather than disappearing once normal (time-restricted) eating resumed.

Is it safe for someone with Parkinson's to try fasting?

This should only be done with a neurologist's supervision. Parkinson's medications often need to be taken on a strict schedule and sometimes with food, and the fasting protocol used in this study was intensive and medically supervised.

Did quality of life improve along with the symptom scores?

No — the study found no significant change in quality of life (PDQ-39), self-reported daily living function, or sleep measures, even though clinician-rated motor and non-motor symptom scores improved.

Related Research and Articles

• Does Intermittent Fasting Cause Autophagy?
• Intermittent Fasting, Brain Health, and Neuroscience
• The Gut-Brain Connection During Fasting
• Does Fasting Improve Brain Function?
• Does Intermittent Fasting Reduce Inflammation?

Want the complete guide to fasting? Get Intermittent Fasting in Practice on Amazon — and claim 3 months free on our fasting app at fastinginpractice.com/redeem.