Medical Disclaimer & Safety Notice
Informational & Educational Nature Only
The calculations, schedules, biological stage descriptions, and articles provided on FastTrack are created solely for informational, behavioral timing, and educational purposes. FastTrack is not a medical device, diagnosis engine, or therapeutic prescription. Nothing on this website should be interpreted as medical advice, clinical diagnosis, or a replacement for consultation with a licensed healthcare physician.
Who Should NOT Practice Intermittent Fasting
Intermittent fasting protocols—particularly prolonged durations like 18:6, 20:4, and OMAD—impose metabolic and endocrine stress that can be hazardous for certain populations. Fasting is contraindicated for:
- Pregnant or Breastfeeding Individuals: Fetal development and milk production demand consistent energy substrates, essential fatty acids, and continuous micronutrient delivery.
- History of Eating Disorders: Individuals with past or present diagnoses of anorexia nervosa, bulimia nervosa, binge eating disorder, or orthorexia should avoid time-restricted feeding rules that can trigger restrictive or binge-eating cycles.
- Minors Under 18 Years of Age: Growing adolescents and children experience distinct developmental hormone and caloric requirements and should not fast without pediatrician supervision.
- Type 1 Diabetes Mellitus: Unsupervised fasting in insulin-dependent diabetes carries a high risk of life-threatening hypoglycemia and diabetic ketoacidosis (DKA).
Fasting, Medications, and Chronic Conditions
If you take prescription medications, especially:
- Oral hypoglycemics (metformin, sulfonylureas, SGLT2 inhibitors) or insulin for Type 2 Diabetes;
- Antihypertensive medications (blood pressure drugs);
- Medications that require food ingestion to prevent gastric ulceration (NSAIDs, certain antibiotics);
you must work directly with your prescribing healthcare provider to adjust dosages before changing meal timings.
Physiological Variation & Scientific Uncertainty
Every human body possesses unique metabolic, hormonal, and enzymatic profiles. Milestones described on FastTrack (such as the onset of fat oxidation or autophagic signaling) represent generalized biological ranges observed in controlled scientific literature. The exact timing of these shifts varies based on basal glycogen depletion, past meal composition, physical activity, sleep, age, and individual genetic traits. FastTrack makes no guarantees of specific weight loss, metabolic outcomes, or therapeutic disease reversals.
When to Break Your Fast Immediately
Always listen to your body. If you experience dizziness, lightheadedness, cold sweats, heart palpitations, nausea, persistent headaches, or fainting, terminate your fast immediately by drinking water with electrolytes and consuming a balanced, easily digestible whole-food snack.