Evidence-Based Answers

Frequently Asked Questions

Clear, scientifically supported answers to common intermittent fasting questions.

Plain water, naturally sparkling mineral water, unsweetened black coffee, and green or herbal teas contain negligible calories and do not stimulate significant digestive insulin secretion. For fasting purposes, the primary objective is avoiding added sugars, milks, creamers, or caloric syrups that interrupt digestive rest.