The 16:8 method is the most popular intermittent fasting protocol for a reason: it works, it's sustainable, and it fits real life. Fast for 16 hours. Eat in an 8-hour window. That's it.
But knowing the basics isn't enough. Here's everything you need to actually make it work.
How 16:8 Works
Most people skip breakfast and eat from noon to 8pm. You fast from 8pm to noon the next day — 16 hours, most of it spent sleeping. It's the most accessible fast you can do.
What to Expect Week by Week
Week 1: Hunger peaks at your usual breakfast time. Your body is used to expecting food. Push through — hunger is hormonal and passes in 20 minutes.
Week 2: Hunger normalizes. Energy during the fast stabilizes. Mental clarity starts to improve.
Week 3-4: The fast becomes automatic. Fat burning is efficient. This is when most people notice body composition changes.
The 3 Rules That Make or Break 16:8
Rule 1: Break your fast with protein. Your first meal sets your insulin response for the day. Lead with 30-40g of protein to blunt hunger and preserve muscle.
Rule 2: Replace your electrolytes. As insulin drops during your fast, your kidneys excrete sodium. Sodium pulls water, potassium and magnesium follow. Replace them or deal with headaches, brain fog, and fatigue.
Rule 3: Protect your muscle with creatine. Extended fasting increases muscle protein breakdown. 5g of creatine monohydrate daily counteracts this with zero impact on your fast — it has zero calories and causes zero insulin response.
What to Drink During Your Fast
- Water — as much as you want
- Black coffee — yes, it's fasting-safe
- Plain tea — no sugar, no milk
- Electrolyte supplements — zero sugar only
Common 16:8 Mistakes
- Eating too little in your window — you'll burn out
- Eating junk in your window — the fast doesn't cancel bad food
- Skipping electrolytes — this is the #1 cause of fasting symptoms
- Expecting overnight results — give it 3 weeks minimum
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