Fasting, or intermittent fasting, has become one of the most popular trends in health and wellness. But it is much more than a passing fad; it is an ancestral practice with scientifically proven benefits. If you are new to the world of fasting and feel overwhelmed by the information, this guide is for you. We will break it down step by step, explore the science behind it and give you a safe plan for getting started.
What Is Fasting? More Than “Not Eating”
Intermittent fasting (IF) is not a diet, but an eating pattern. It cycles between periods of eating and periods of fasting. It does not specify what to eat, but when to eat. Essentially, it is about aligning your meals with your body’s internal clock to optimise bodily functions.
The basic principle: eating and fasting windows
- Eating window: The period of the day during which you consume all your calories (for example, between 12:00 and 20:00).
- Fasting window: The period during which you refrain from consuming calories (for example, from 20:00 until 12:00 the following day). During this time, you can drink water, black coffee or black tea.
The Science Behind It: Why Does Fasting Work?
When we do not eat for an extended period, the body enters a different metabolic state. Here is what happens:
1. Lower insulin levels
Blood insulin levels fall significantly, making it easier to burn fat.
2. Increased growth hormone secretion
Growth hormone (HGH) can increase by up to five times. This hormone boosts fat burning, muscle growth and metabolic rate.
3. Autophagy: the cellular “clean-up” process
This is one of the most important benefits. Autophagy is a process through which our cells “recycle” old and damaged components. It is like an internal cleaning service that protects against disease, including cancer and neurodegenerative diseases, and delays the ageing process. The 2016 Nobel Prize in Medicine was awarded to Yoshinori Ohsumi precisely for discoveries related to autophagy.
The Benefits of Fasting: Why Is It Worth Trying?
Implementing intermittent fasting can bring a wide range of benefits:
- Weight loss and loss of visceral fat: Without the need to consciously count calories, fasting often leads to a reduction in calorie intake and more efficient fat burning.
- Improved insulin sensitivity: It lowers the risk of developing type 2 diabetes.
- Better brain health: It increases production of a hormone called BDNF (brain-derived neurotrophic factor), which promotes the growth of new neurons and protects against Alzheimer’s disease.
- Reduced inflammation: One of the main factors underlying many chronic diseases.
- Longevity: Animal studies show that fasting may extend lifespan.
Popular Fasting Methods for Beginners
Choose a method that fits your lifestyle. Here are the most common ones:
To complement the information above, you can also read Longevity Starts on Your Plate: How Food Influences Your Lifestyle and Mental Health, an article that expands on an aspect directly related to this topic.
The 16/8 method (the “Leangains” method)
- Description: You fast for 16 hours each day and fit all your meals into an eight-hour window. It is the most popular and easiest method to manage.
- For beginners: Start by skipping breakfast, having your first meal at around 12:00, and eating your last meal before 20:00.
The 5:2 method (the Fast Diet)
- Description: You eat normally five days a week, while on the other two, non-consecutive days, you reduce your calorie intake to 500–600 calories a day.
- For beginners: Choose two less demanding days (for example, Tuesday and Thursday) and plan your small meals carefully to make sure they are filling and nutritious.
The “Eat-Stop-Eat” method
- Description: This involves a complete 24-hour fast once or twice a week (for example, from Monday lunch until Tuesday lunch).
- For beginners: This is a more advanced method. It is advisable to start with the 16/8 method before trying a 24-hour fast.
How to Start: A Step-by-Step Plan for the First Week
Days 1–3: Mental preparation and a gradual transition
- Goal: Gradually shorten your eating window.
- Action: Start by finishing dinner earlier in the evening (before 20:00) and delaying breakfast by an hour. Drink a large glass of water in the morning. You can have unsweetened coffee or black tea.
Days 4–7: Implementing the 16/8 method
- Goal: To get your body used to a 16-hour fast.
- Action:
- 12:00 — First meal (a healthy lunch with protein, good fats and fibre).
- 16:00 — A small snack, if needed: a handful of nuts or a piece of fruit.
- 19:30 — Dinner (balanced, similar to lunch).
- 20:00 — Start fasting. Drink water, tea or black coffee until lunchtime the next day.
Key tip: Listen to your body
Feeling hungry? Drink water or tea. It may simply be thirst in disguise. Feeling dizzy or extremely weak? You may be being too drastic. Eat something small and healthy, then try again the next day.
What Should You Eat During Your Eating Window? Quality Matters
Although fasting does not restrict foods, nutritional quality is essential to gaining all the benefits.
Recommended foods
- Protein: Meat, fish, eggs, legumes and tofu.
- Healthy fats: Avocado, nuts, seeds, olive oil and coconut oil.
- Complex carbohydrates: Vegetables, fruit, oats, quinoa and sweet potatoes.
- Fibre: Leafy greens, legumes and peanuts.
Foods to avoid
- Added sugar and high-fructose corn syrup.
- Refined carbohydrates (white bread and white pasta).
- Ultra-processed foods.
Sample menu for a 16/8 fasting day:
- Lunch (12:00): Quinoa salad with grilled chicken breast, avocado and an olive-oil dressing.
- Snack (16:00): An apple with a tablespoon of peanut butter.
- Dinner (19:30): Baked salmon with roasted vegetables and lemon pickle.
Common Pitfalls and How to Avoid Them
- Eating too much during the eating window: Fasting is not an excuse to overeat. Follow your body’s fullness signals.
- Not drinking enough fluids: Dehydration is a common cause of headaches and fatigue. Drink at least 2 litres of water a day.
- Choosing a method that is too drastic: Start with something easier, such as 14/10, before moving on to 16/8. Do not jump straight into 24-hour fasts.
- Giving up too quickly: The body needs time to adapt. Try to be consistent for at least a month before drawing conclusions.
Contraindications: Who Should NOT Practise Fasting?
Fasting is not for everyone. Always consult a doctor before starting, especially if you have:
- Diabetes or blood-sugar problems.
- Low body weight (BMI < 18.5).
- A history of eating disorders.
- Pregnancy or breastfeeding.
- Severe thyroid problems.
Conclusion: Fasting as a Lifestyle
Intermittent fasting is more than a dietary protocol; it is a powerful tool that can improve your metabolic health, mental clarity and long-term quality of life. The key to success is consistency, adapting it to your own needs and always listening to your body. There is no one-size-fits-all approach. Experiment, be patient and enjoy the journey towards a healthier version of yourself.
Note: This article is for informational purposes and does not replace professional medical advice. Always consult a doctor or nutritionist before starting any new diet or fasting programme.
