Intermittent fasting (IF) isn't a diet. It's a schedule. You don't change what you eat — you change when. That distinction is why so many of my clients have success with it where every other "diet" failed.
But IF is also massively misunderstood, and the wrong people are doing it. Here's the clinical reality.
What intermittent fasting actually is
In a typical eating pattern, your body switches between two states: fed (insulin high, storing energy) and fasted (insulin low, accessing stored energy). Most people eat from 7 AM to 10 PM — that's 15 hours fed, 9 hours fasted. The body never gets a meaningful chance to access fat stores.
Intermittent fasting deliberately extends the fasted window. The most common protocol is 16:8 — eat all your meals in an 8-hour window (e.g., noon to 8 PM), fast the other 16 hours.
That's it. It's not magic. It's not "starvation mode" (that doesn't exist short of weeks of severe restriction). It's a way to create a calorie deficit without counting and to give your insulin a long break.
The methods that actually work
16:8 (the default). Eat 12 PM to 8 PM. Skip breakfast or push it to lunch. Sustainable for most people indefinitely.
14:10 (the gentle entry). Eat 10 AM to 8 PM. Easier to start. Still produces benefits.
5:2. Eat normally five days a week, restrict to 500–600 calories on two non-consecutive days. Harder to follow but works for some.
18:6. Eat 1 PM to 7 PM. More aggressive — better for stubborn fat loss but harder long-term.
I rarely recommend anything stricter (24-hour fasts, OMAD/one-meal-a-day) outside of specific clinical situations. The downside risk on hormones outweighs the upside.
What happens in your body during a fast
- Hours 0–4 (after a meal): insulin elevated, body using glucose
- Hours 4–12: insulin drops, body shifts toward burning fat
- Hours 12–16: ketone production begins, growth hormone rises modestly
- Hours 16+: autophagy activates — cells clear damaged proteins
The autophagy and growth hormone effects are real but modest at the 16-hour mark. The bigger benefit for most people is simpler: eating in a smaller window means eating less food, which means a calorie deficit, which means weight loss.
The benefits that hold up
Studies consistently show:
- Weight loss comparable to traditional calorie restriction, often easier to sustain
- Improved insulin sensitivity (very relevant for prediabetes and PCOS)
- Lower fasting glucose and triglycerides
- Reduced inflammation markers
- Simpler decision-making — you skip the "should I have breakfast?" debate
Note: most studies are short (8–24 weeks). The very long-term picture is still being researched.
Who should NOT do intermittent fasting
This is the part the influencers skip. Do not start IF if you:
- Are pregnant or breastfeeding
- Have a history of eating disorders (binge eating, anorexia, bulimia)
- Have type 1 diabetes or are on insulin
- Are underweight (BMI under 18.5)
- Are under 18
- Are training hard for athletic competition
- Have severe stress or are recovering from burnout
For women specifically, IF can disrupt menstrual cycles in some — particularly if combined with hard exercise and an aggressive deficit. If your period changes, stop.
Consult Nutrition Coach Rawan before starting if you have any chronic condition or take medication. Some medications need food.
How to start (the 4-week ramp)
Week 1: 12-hour overnight fast. Stop eating at 8 PM, breakfast at 8 AM. This is most people's natural pattern anyway.
Week 2: 14-hour fast. Eat 10 AM to 8 PM. Notice if you have more energy or any hunger.
Week 3: 16-hour fast. Eat noon to 8 PM. The first 3–4 days will feel hungry around 10 AM. Drink water and black coffee. It passes.
Week 4: Settle into 16:8 as a sustainable rhythm. Don't go more aggressive unless you're working with a clinician.
What to eat in your eating window
This is where most people sabotage themselves. They fast 16 hours, then eat two large bowls of rice and a baklava. The fast doesn't undo a 3,000-calorie eating window.
Inside your window, follow the standard rules:
- 30–40g protein at each meal
- Vegetables with at least two meals
- Healthy fats (olive oil, avocado, nuts)
- Don't skip the protein and fat — they're what keep you full into the next fast
What to drink during the fast
These do NOT break a fast:
- Water (still or sparkling)
- Black coffee
- Plain tea (any colour, no milk, no sugar)
- Bone broth (technically yes, but tiny calorie load)
These DO break a fast:
- Anything with calories — milk in coffee, cream, sweetener, juice, even sparkling water with "natural flavours" if it has artificial sweeteners
Stick to water and black coffee for clean results.
Track your progress (without obsessing)
Don't weigh yourself daily — water fluctuations will lie to you. Weigh weekly, same time, same conditions. Track waist circumference monthly. Track all of it inside Greenofig so you have a real trend, not noise.
Bottom line
Intermittent fasting is a powerful tool when used correctly, by the right person, with smart food choices inside the eating window. It's not magic. It's not for everyone. But for the people it suits, it's the simplest sustainable framework for weight loss I know.
Next in the series: Gut health diet — 10 foods that heal your gut naturally.
