⏰ Intermittent Fasting 16:8 — A Complete Beginner's Guide

Intermittent fasting is one of the most popular eating strategies worldwide — simple, flexible, and backed by growing scientific evidence for weight management and metabolic health benefits.

What is 16:8 Intermittent Fasting?

Fast for 16 consecutive hours, then eat freely within an 8-hour window. A typical schedule: last meal at 8 PM, first meal at noon the next day. Most of the 16-hour fast occurs during sleep, making it far easier than it initially sounds. You skip breakfast and have your first meal at lunch — no calorie counting, no food restrictions, just time management.

What Happens During Fasting — Hour by Hour

Hours 0-4: digesting and absorbing your last meal. Hours 4-12: blood glucose returns to baseline, glycogen stores begin depleting. Hours 12-14: fat burning begins as glycogen runs low, growth hormone rises, insulin drops further. Hours 14-16: deeper fat oxidation, insulin at low levels promoting fat burning. Hours 16+: autophagy begins (cellular repair and cleanup), ketone production increases meaningfully.

What Breaks Your Fast?

Anything with meaningful calories breaks the metabolic fast. Completely safe during fasting period: plain water, black coffee with absolutely nothing added, plain herbal tea, sparkling water. These break the fast: any food regardless of quantity, milk or cream in coffee, juice, protein shakes, most medications with food content. For maximum benefit, keep the fasting period strictly calorie-free.

Starting Successfully

Week 1: set your last meal at 8 PM and do not eat until noon. Expect hunger peaks around days 3-5 as your body adapts — this is normal and temporary. Drink plenty of water. Black coffee effectively suppresses morning hunger for most people. Within 2 weeks, the schedule typically feels natural and hunger patterns shift to align with the eating window. Use our free IF calculator to plan your personalised eating and fasting schedule.