Intermittent fasting (IF) isn't a diet — it's a timing strategy. Instead of changing what you eat, you change when you eat. This simple shift has helped millions of people reduce calorie intake effortlessly, improve metabolic health, and lose weight without the misery of traditional dieting.
How Intermittent Fasting Works
When you eat, your insulin levels rise, signalling cells to store energy. During a fast, insulin drops, and your body begins tapping stored fat for fuel. After 12–16 hours without food, fat oxidation increases substantially and your body may enter mild ketosis — a fat-burning state.
IF works primarily by making it easier to eat less. Condensing your eating into a shorter window naturally reduces opportunities to consume excess calories — without requiring calorie counting.
The 3 Most Popular Protocols
16:8 (Leangains Method)
Fast for 16 hours, eat within an 8-hour window. For most people this means skipping breakfast and eating from noon to 8 pm. It's the most popular protocol because it's easy to implement — the overnight fast handles 8 of your 16 hours automatically.
5:2 Diet
Eat normally five days a week. On two non-consecutive days, restrict calories to 500–600. You're not truly "fasting" on those days, but the significant deficit creates a large weekly calorie gap without daily restriction.
OMAD (One Meal a Day)
The most extreme protocol: eat all your calories in one sitting. This creates a natural 23:1 fast:feed ratio. Effective for rapid fat loss but difficult to get adequate nutrition and very hard to sustain long-term.
The best IF protocol is the one you can actually stick to. Most beginners should start with 14:10 and progress to 16:8 over 2–3 weeks to minimise hunger and side effects.
Benefits Beyond Weight Loss
- Improved insulin sensitivity: Regular fasting lowers fasting insulin and blood glucose over time
- Cellular autophagy: Extended fasts trigger cellular cleanup processes that remove damaged proteins
- Reduced inflammation: Some studies show lower inflammatory markers with IF
- Simplicity: Fewer meals means less meal planning, prep, and decision fatigue
Who Should Avoid IF
Intermittent fasting is not appropriate for everyone. Avoid it if you are pregnant or breastfeeding, have a history of disordered eating, are underweight, have type 1 diabetes, or are under 18. Always consult a doctor before starting if you take medications affected by food timing.
Tips for Getting Started
- Start with a 12-hour fast (e.g. 8 pm to 8 am) and extend gradually
- Black coffee, plain tea, and water are fine during the fast
- Break your fast with a protein-rich meal to reduce hunger later
- Don't compensate by overeating in your window — total calories still matter
- Expect mild hunger for the first 1–2 weeks; it normalises as ghrelin adapts
Calculate Your Calorie Target
Use our free calorie calculator to find your daily calorie goal to pair with your fasting schedule.
Open Calorie Calculator →The Bottom Line
Intermittent fasting is a flexible, sustainable approach to managing calorie intake that works well for many people — but it's not magic. The weight loss it produces comes from eating less overall. If IF helps you do that naturally, it's an excellent tool. If it makes you ravenous and prone to bingeing in your eating window, a different approach may suit you better.