What is Intermittent Fasting and Should I Do It?

Intermittent fasting has become one of the most talked-about nutrition strategies in recent years. From social media success stories to celebrity endorsements, it’s often promoted as a simple way to lose weight, improve health, and boost energy.

 

But what is intermittent fasting really, how does it work, and is it something everyone should try?

 

Let’s break down the science, the benefits, the risks, and who intermittent fasting may (or may not) suit.

 

What is Intermittent Fasting?

Intermittent fasting is an eating pattern that cycles between periods of eating and fasting. Rather than focusing on what foods to eat, it focuses on when you eat.

 

This approach is sometimes called intermittent energy restriction, because food intake is limited during specific fasting times rather than reduced every day. Importantly, intermittent fasting does not involve strict food rules or eliminating food groups; flexibility is key.

 

While fasting has roots in cultural and religious traditions, its modern popularity stems from growing interest in metabolic health, weight management, and simplicity.

 

How Does Intermittent Fasting Work in the Body?

Intermittent fasting works primarily by changing eating patterns in a way that can reduce overall energy intake for some people.

 

During fasting periods:

• Insulin levels may drop, allowing the body to access stored energy
• The body shifts between using glucose and fat as fuel
• Some research suggests improvements in insulin sensitivity

 

You may also hear about autophagy, a cellular “clean-up” process that occurs during periods of low energy intake. While this is well supported in animal research, human evidence is still emerging, so it’s best viewed as a potential benefit rather than a guarantee.

 

Common Methods and Schedules

There are several popular methods, and no single approach is considered “best” for everyone.

 

Common options include:

• 12:12 – fasting for 12 hours, eating within 12 hours
• 14:10 – fasting for 14 hours, eating within 10 hours
• 16:8 – fasting for 16 hours, eating within 8 hours
• 5:2 – eating normally 5 days per week and reducing intake on 2 non-consecutive days
• Eat Stop Eat – one or two full fasting days per week

 

A healthy schedule is one that fits your lifestyle, training load, and recovery needs. Sustainability matters far more than extreme fasting times.

 

What Are the Claimed Benefits?

Some intermittent fasting benefits are supported by research, while others are still being explored.

 

Potential benefits include:

• Modest improvements in blood pressure and cholesterol
• Reduced inflammation markers
• Improved insulin sensitivity for some individuals

 

However, many benefits appear similar to those seen with traditional calorie-controlled diets. Intermittent fasting is not a magic solution; it’s simply one of many possible approaches.

 

Intermittent Fasting for Weight Loss: What the Research Says

Using fasting for weight loss can work for some people because it helps regulate eating patterns and reduce calorie intake.

 

Research generally shows:

• Similar weight loss results compared to standard calorie-controlled diets
• No consistent evidence that it’s superior for fat loss

 

Claims about fasting to lose stomach fat should be approached cautiously. Fat loss occurs across the body based on genetics and overall energy balance; targeted fat loss isn’t possible.

 

Long-term success comes from habits you can maintain, not quick fixes.

 

What to Eat During Intermittent Fasting (And When to Break a Fast)

Knowing what to eat is just as important as fasting itself.

 

During eating windows, prioritise:

• High-quality protein
• Fibre-rich vegetables and whole grains
• Healthy fats
• Adequate hydration

 

Best foods to break a fast include:

• Protein-rich meals (eggs, yoghurt, lean meats, tofu)
• Fibre-rich carbs (fruit, oats, vegetables)
• Balanced meals rather than ultra-processed foods

 

This approach supports energy, digestion, and training performance.

 

Is it Right for Everyone?

Intermittent fasting is not suitable for everyone.

 

People who should be cautious or avoid fasting include:

• Those with a history of disordered eating
• Individuals recovering from chronic dieting
• People training multiple times per day
• Anyone experiencing persistent fatigue, dizziness, or poor concentration

 

The dangers often come from under-fueling, which can negatively impact hormones, recovery, and mental health.

 

Intermittent Fasting for Women, Hormones and Menopause

Women require special consideration due to hormonal sensitivity. Some women may experience:

• Disrupted menstrual cycles
• Increased stress responses
• Reduced energy availability

 

During menopause, the best fasting approach for menopause is often more gentle (such as 12:12 or 14:10), combined with adequate protein and strength training.

 

Individual response varies, so flexibility is essential.

 

How to Balance Training Performance

Fasting may not align well with long or intense training days.

 

Without adequate fuel:

• Strength and HIIT performance can suffer
• Recovery may be compromised
• Injury risk can increase

 

Training is best supported by appropriate nutrition timing. Remember, food is fuel for your workout, not something to earn or restrict.

 

When to Speak to a Nutrition Coach or Weight Loss Coach

Because responses to fasting vary, personalised guidance matters.

 

A nutrition coach or weight loss coach can help you:

• Decide whether intermittent fasting suits your goals
• Create a sustainable eating pattern
• Maintain a healthy relationship with food

 

Professional support is especially important if weight loss feels difficult or confusing. Sometimes the smartest move is to eat smarter rather than eat less.

 

Should You Try Intermittent Fasting?

Intermittent fasting can be a helpful tool for some people, but it’s not a requirement for health, fat loss, or performance.

 

The most effective approach is one that:

• Supports training and recovery
• Fits your lifestyle
• Helps you create a healthy lifestyle
• Is sustainable long term

 

If intermittent fasting feels stressful, restrictive, or harmful, it’s not the right choice, and that’s okay. Health isn’t built on trends; it’s built on consistency, nourishment, and enjoyment.