What do you need to know about water fasting — and is it safe?

Water fasting involves consuming only water for a defined period. It can affect blood sugar, blood pressure, and electrolyte balance. In this episode, we explain the physiological effects and how fasting safety is assessed in Europe.

In this episode, we cover:

• What water fasting is (complete caloric restriction with water intake only)

• How fasting affects glucose, insulin, and ketone production

• Short-term effects: dizziness, fatigue, dehydration risk

• Risks of electrolyte imbalance and low blood pressure

• Increased hypoglycaemia risk in people with diabetes

• Effects on muscle mass and metabolic rate

• Who should not attempt water fasting (pregnancy, eating disorders, chronic illness)

• Warning signs requiring immediate medical assessment

• Situations where treatment adjustments may be declined without monitoring

Doctors assess BMI, HbA1c, blood pressure, kidney function, medication use, cardiovascular risk, and mental health history before advising prolonged fasting. Extended water fasting is not appropriate for many individuals without supervision. Severe weakness, confusion, fainting, or chest pain requires urgent in-person evaluation.

This episode reflects how fasting and metabolic risk are reviewed within structured medical assessment in European telemedicine at Mobi Doctor.

Read the full medical guide here:

https://www.mobidoctor.eu/blog/all-you-need-to-know-about-water-fasting