Basically every adult can fast. Pregnant and breastfeeding women are excluded, as their bodies have special needs during these times.

The following groups of people should check with their doctor whether intermittent fasting is an option for them:

• Chronically ill people (including type 1 and 2 diabetes; liver, kidney or heart diseases, gout, etc.)
• People dependent on regular medication
• People with an existing or past eating disorder as well as underweight people