Last updated: 31-10-2026
Flexible Fasting Guide provides general educational information about intermittent fasting, eating schedules, nutrition and related books and programmes.
Our content is not personal medical advice and does not replace assessment or treatment from a qualified healthcare professional.
Information, not individual treatment
Articles, meal examples, comparison tables and suggested schedules cannot account for your medical history, medications, nutritional needs or current symptoms.
We do not diagnose conditions, prescribe treatment or determine whether fasting is safe for an individual reader.
Reading our website or contacting us does not create a healthcare professional–patient relationship. Email responses cannot provide medical clearance to begin or continue fasting.
Speak with a healthcare professional
Before starting intermittent fasting or making a substantial change to your eating pattern, discuss its suitability with a qualified healthcare professional.
This is particularly important if you have a medical condition, take medication, have experienced low blood sugar or have concerns about meeting your nutritional needs.
A schedule described on this website is an example of an eating pattern, not a prescription for you.
Fasting is not suitable for everyone
Johns Hopkins Medicine identifies children and teenagers under 18, people who are pregnant or breastfeeding, people with type 1 diabetes taking insulin, and those with a history of eating disorders as groups who should not try intermittent fasting.
Being outside those groups does not establish that fasting is suitable for you. Individual assessment may still be necessary.
Read our guide to who should avoid intermittent fasting for further context.
Do not change medication based on our content
Do not skip, stop, reduce or reschedule prescribed medication to fit a fasting window based on information from this website.
Ask your prescriber or pharmacist about medication timing, food requirements and any risks associated with changing when you eat.
If a healthcare professional gives you instructions that differ from a general article here, follow your individual care plan.
Symptoms need appropriate attention
Do not assume that feeling unwell is a necessary part of fasting or evidence that a programme is working.
If symptoms develop, stop treating the fasting target as the priority and seek appropriate medical advice. Do not use an article to decide that a concerning symptom is harmless.
If you believe you are experiencing a medical emergency, contact local emergency services immediately. Do not wait for an email response from this website.
Our intermittent fasting side effects guide provides general information but cannot assess your symptoms.
Longer fasting is not automatically better
An article describing a longer fasting period does not establish that it is safer, more effective or appropriate for you.
Johns Hopkins Medicine cautions that extended periods without food are not necessarily better and may be dangerous.
Do not extend a fast to compensate for eating, accelerate promised results or match someone else’s experience.
Research has limits
Research findings apply to the populations, methods and conditions studied. Results from one fasting schedule cannot automatically be applied to another.
Animal research, proposed biological mechanisms and short studies do not establish long-term benefits for every person.
We aim to distinguish research findings from uncertainty and seller claims. However, our articles are not a complete review of every study and may not reflect developments after their latest review.
Our Editorial Policy explains our approach to sources and updates.
No guaranteed results
We do not guarantee weight loss, changes in blood tests, disease prevention or other health outcomes.
Examples and testimonials do not predict your experience. Changes in body weight or symptoms also do not establish that an eating pattern is nutritionally adequate or medically appropriate.
Do not use fasting as a substitute for prescribed treatment or ongoing medical monitoring.
Product reviews and affiliate links
Some pages discuss commercial products, including Eat Stop Eat, and may contain links that earn us a commission.
A recommendation or affiliate relationship does not constitute medical approval. General research about intermittent fasting does not prove that a particular commercial programme produces the same outcomes.
Review the product’s current information and discuss relevant health concerns with your healthcare professional before purchasing or following it.
Read our Affiliate Disclosure for details about commissions.
Educational meal and exercise examples
Meal suggestions, food quantities and exercise examples are general illustrations. They are not personalised nutrition or exercise plans.
Your needs may differ because of health conditions, allergies, activity, age or other circumstances. A qualified dietitian or appropriate healthcare professional can help assess those needs.
Questions and corrections
For website questions or to report a factual error, visit our Contact page or email info@flexiblefastingguide.com.
Please do not send detailed medical records or request urgent care by email.
Medical reference
Johns Hopkins Medicine: Intermittent Fasting—What Is It, and How Does It Work?