What is Intermittent Fasting?
Intermittent fasting is not about what you eat. It is about when you eat.
You cycle between periods of eating and fasting. During the fasting window, you consume zero calories. During the eating window, you eat your meals normally.
The Three Popular Schedules
16 Hours Fasting, 8 Hours Eating
The most popular method. Fast for 16 hours, eat within an 8-hour window. Example: First meal at 12pm, last meal by 8pm.
Best for beginners18 Hours Fasting, 6 Hours Eating
More aggressive. Fast for 18 hours, eat within 6 hours. Example: First meal at 1pm, last meal by 7pm.
Intermediate levelOne Meal A Day
You eat all your daily calories in one meal. Usually a 23:1 ratio. Not recommended long-term due to difficulty meeting nutritional needs.
Advanced - use with cautionHow Intermittent Fasting Causes Weight Loss
Fasting works through two main mechanisms. Understanding these helps you stick with it.
Calorie Restriction
Fewer eating hours means fewer opportunities to eat. Most people naturally consume 300-500 fewer calories daily without consciously restricting food.
Insulin Regulation
When you fast, insulin levels drop. Low insulin signals your body to use stored fat for energy. Extended fasting periods maximize fat burning.
What Happens During a Fast
Which Schedule Fits Nigerian Lifestyle?
I have worked with hundreds of Nigerian patients on intermittent fasting. Here is what works in practice.
Skip Breakfast (Recommended)
Eat from 12pm to 8pm. Works well because:
- Morning Lagos traffic means rushed breakfast anyway
- Nigerian dinners are social and hard to skip
- Black coffee or tea carries you through morning
- Lunch break aligns with eating window start
Skip Dinner (Harder)
Eat from 7am to 3pm. More difficult because:
- Family dinners are culturally important
- Social events often happen in evenings
- Sleeping hungry disrupts sleep quality
- Only works for early risers with flexible schedules
Sample Nigerian 16:8 Schedule
Fasting Window (8pm - 12pm)
- 6:00am - Wake up, drink water
- 7:00am - Black coffee or green tea
- 9:00am - More water
- 11:30am - Hunger peaks (normal, it passes)
Eating Window (12pm - 8pm)
- 12:00pm - First meal (protein-focused)
- 3:00pm - Light snack if needed
- 7:00pm - Dinner with family
- 8:00pm - Eating window closes
What to Eat During Your Eating Window
Fasting is not a license to eat anything during your window. What you eat still determines your results.
The Protein-First Rule
When you break your fast, eat protein first. This prevents muscle loss and keeps you full longer. Aim for 25-30g protein at your first meal.
Good First Meal Options (Break Your Fast)
- - Grilled fish or chicken with vegetables
- - 3-4 boiled eggs with avocado
- - Moi moi with fish and vegetables
- - Beans porridge (ewa riro) - small portion
- - Greek yogurt with nuts and fruit
- - Pepper soup with assorted meat or fish
- - Ofada rice with ayamase and chicken (small portion)
- - Vegetable salad with grilled suya
Good Dinner Options
- - Efo riro or edikang ikong with small amala
- - Vegetable soup with fish (no swallow)
- - Grilled tilapia with coleslaw
- - Small jollof rice with grilled chicken
- - Okra soup with small eba and turkey
- - Gizdodo (plantain and gizzard) - small portion
- - Ofe nsala with catfish
- - Unripe plantain porridge with fish
Foods to Limit (They Spike Insulin)
- Large portions of swallow (eba, pounded yam, fufu)
- White bread and pastries
- Soft drinks and malt drinks
- Chin chin, puff puff, and fried snacks
- Sweetened fruit juice and smoothies
- Excessive rice or garri
For detailed nutrition guidance, see our Calorie Deficit Guide and Weight Loss Guide for Nigeria.
What Breaks a Fast (And What Does Not)
This causes the most confusion. The rule is simple: anything with calories breaks your fast. Anything that triggers insulin breaks your fast.
OK During Fasting Window
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Water - plain, sparkling, or with lemon
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Black coffee - no sugar, no milk, no cream
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Green tea or black tea - no sweetener
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Plain zobo - unsweetened hibiscus tea only
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Salt - for electrolytes if feeling weak
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Apple cider vinegar - diluted in water
Breaks Your Fast
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Zobo with sugar - sugar breaks the fast
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Malt drinks (Maltina, Malta Guinness) - full of sugar
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Kunu, fura da nono - contain carbs
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Coffee with milk or sugar - even small amounts
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Pap (ogi, akamu) - carbohydrate food
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Any food at all - even "small chops"
What About Artificial Sweeteners?
Technically zero calories, but controversial. Some studies show they trigger insulin response anyway. For best results, avoid sweeteners during fasting windows. If you must use them, stevia is the safest option.
Common Intermittent Fasting Mistakes
Overeating During Eating Window
Fasting 16 hours then eating 5000 calories defeats the purpose. You still need to maintain reasonable portions. Fasting helps control appetite, but you must cooperate.
Not Drinking Enough Water
Many people confuse thirst with hunger. Drink at least 2-3 liters during fasting hours. Add a pinch of salt if you feel weak or dizzy.
Breaking Fast with High-Carb Foods
Breaking a 16-hour fast with a plate of white rice spikes your blood sugar dramatically. Always break your fast with protein first, then add other foods.
Starting Too Aggressively
Jumping straight to 20:4 or OMAD leads to failure. Start with 12:12 for a week, then 14:10, then 16:8. Let your body adapt gradually.
Not Getting Enough Protein
With fewer meals, you need to prioritize protein at every eating opportunity. Aim for at least 1.2g per kg of body weight to preserve muscle mass.
Being Inconsistent with Timing
Eating at 12pm Monday, 10am Tuesday, and 2pm Wednesday confuses your body. Pick a schedule and stick to it at least 5 days a week.
Who Should NOT Do Intermittent Fasting
Intermittent fasting is safe for most healthy adults. However, certain groups should avoid it or consult a doctor first.
Do NOT Fast If You Are:
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Pregnant or breastfeeding
Your baby needs consistent nutrition
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Diabetic on insulin or sulfonylureas
High risk of dangerous hypoglycemia
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Under 18 years old
Growing bodies need regular nutrition
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Underweight (BMI below 18.5)
You need to gain weight, not lose it
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History of eating disorders
Fasting can trigger disordered eating patterns
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Taking medications requiring food
Some medications must be taken with meals
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Recovering from surgery or illness
Your body needs consistent fuel to heal
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High-intensity athletes
May need more frequent fueling - consult a sports nutritionist
Consult Your Doctor First If You:
- - Have Type 2 diabetes (even if not on insulin)
- - Have thyroid disorders
- - Have a history of gallbladder problems
- - Take blood pressure medications
- - Have chronic kidney disease
Combining Intermittent Fasting with GLP-1 Medications
Many of our patients ask about combining Semaglutide or Tirzepatide with intermittent fasting. The short answer: it can work, but requires careful adjustment.
Why They Work Well Together
- GLP-1 medications already reduce appetite - fasting becomes easier
- Both improve insulin sensitivity and blood sugar control
- Combined calorie reduction accelerates weight loss
- Time-restricted eating creates structure for medication users
Important Cautions
- Start slow: Begin with 14:10 fasting while your body adjusts to medication
- Protein priority: You MUST hit protein targets to prevent muscle loss
- Watch for nausea: Extended fasting + GLP-1 can worsen nausea for some people
- Stay hydrated: Both fasting and GLP-1 medications increase dehydration risk
- Listen to your body: If you feel unwell, reduce fasting hours or stop
Recommended Approach
- Week 1-2: Start medication without fasting - let your body adjust
- Week 3-4: Introduce 12:12 fasting (12 hours eating, 12 hours fasting)
- Week 5-6: Extend to 14:10 if feeling well
- Week 7+: Move to 16:8 if desired and tolerated
Frequently Asked Questions
Can I exercise while fasting?
Will I lose muscle if I fast?
How much weight can I lose with intermittent fasting?
What if I get headaches while fasting?
Can I fast during Ramadan differently?
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