Fasting retreats in Portugal offer supervised programs where you abstain from solid food for a set period, usually with medical or naturopathic oversight, guided support, and a structured refeeding phase.

The centers listed here run water fasting, juice fasting, and modified fasting programs lasting anywhere from three days to several weeks. Supervision matters more in this category than any other.

Extended fasting affects blood pressure, electrolytes, and medication absorption, so look for retreats with health screening at intake and staff qualified to monitor you throughout. Many guests come for weight loss, metabolic reset, or a break from chronic inflammation; others fast for mental clarity or as part of a broader health overhaul.

Talk to your doctor before booking, especially if you take medication or have an existing condition. Compare fasting retreats in Portugal using the filters below, and read each listing’s supervision details carefully. Our retreat quiz can help you decide whether a strict fast or a gentler detox program suits you better.