Common Intermittent Fasting Mistakes and How to Avoid Them

Intermittent fasting (IF) has become a popular approach for weight management and metabolic health, but it’s not always smooth sailing. Many people run into obstacles that can derail progress, especially early on. The good news? Most mistakes are easy to fix once you know what to look out for – and having the right support makes all the difference.

Skipping Meals Without a Plan

One of the biggest intermittent fasting mistakes is jumping in without a plan. It might seem straightforward to just skip breakfast or delay your first meal, but without a structured eating window and balanced meals, your energy and focus can take a hit.

Planning your meals ahead helps ensure you get enough nutrients throughout your day. Following a nutritionist-developed meal plan, like The Fast 800, takes the guesswork out of meal planning. You’ll get personalised meal plans tailored to your goals, complete with healthy recipes and automated shopping lists, ensuring you’re hitting your nutritional targets during your eating window.

Overeating During Eating Windows

After a long fasting period, it’s tempting to eat as much as possible, but this can undo the benefits of intermittent fasting¹. The aim isn’t to restrict and then binge, but to create a balanced, sustainable eating pattern.

With our weight loss programme, you’ll learn about portion control and proper nutrition through our behaviour change course, helping you build new habits you can stick to. Our programme also includes almost 10000 recipes designed to keep you fuller for longer, while the app allows you to track your progress easily. Plus, having a supportive community and health coach guidance means you’re never figuring this out alone.

Not Staying Hydrated

It’s easy to forget to drink water during fasting hours, but hydration plays a big role in how you feel. Headaches, low energy, and hunger pangs often stem from dehydration, not actual hunger².

The Fast 800 programme includes education on hydration alongside your meal plans, helping you create a healthy routine. Plain water, herbal teas, and black coffee can all help you stay hydrated while fasting – and our health coaches can offer personalised advice when you need it. Understanding the science behind hydration supports both your fasting success and overall well-being.

Fasting Too Aggressively, Too Soon

Trying to fast for 18 or more hours right away can backfire. While some people thrive on longer fasts, most benefit from easing into it³. Starting with a 12:12 or 14:10 fasting schedule gives your body time to adjust without unnecessary stress.

This is where The Fast 800’s flexible approaches stand out. You can start with The New 5:2 (two 800-calorie days per week) for a gentler introduction, or choose The Very Fast 800 if you’re ready for more structured fasting. As your needs change, you can easily switch between approaches. The programme guides you through each option, helping you find what works best for your body and lifestyle.

Fast weight loss isn’t just about longer fasts, but about consistency and pairing fasting with healthy meals.

Ignoring Nutritional Balance

Fasting alone won’t make up for poor food choices. Some people break their fast with ultra-processed snacks or skip key food groups, which can affect energy, mood, and long-term progress.⁴

Every meal plan our programme is designed to include protein, fibre, and healthy fats – the nutrients that matter most. Our recipes follow Mediterranean-style eating principles, proven to support long-term health. You’ll also access educational content that explains why nutritional balance matters, empowering you to make informed choices. When cooking isn’t realistic, weight loss shakes or meal replacement shakes offer a nutritionally complete alternative.

Relying Too Heavily on Processed Foods

While fasting focuses on timing, what you eat still matters. Some people fall into the trap of choosing processed convenience foods during their eating window, especially when short on time.

Whole foods and high-quality ingredients make a big difference to ensure you’re nourishing your body properly⁵. Our recipes aren’t just healthy but convenient too, taking away the pressure of complicated cooking and the reliance on processed food.

Forgetting to Adjust as You Go

Your intermittent fasting needs might change as your schedule, hormones, or activity levels shift. What worked when you started might not feel right a few months in.

Regularly check in with how you feel, your progress, and your goals. Don’t be afraid to adjust your fasting window or meals. The best fasting plan is the one that works for your lifestyle. Our programme is built for real life with supportive health coaches who can help you spot areas for adjustments, so a healthy routine becomes sustainable, not impossible.

Why The Fast 800 Programme Works

Intermittent fasting doesn’t need to be complicated. The Fast 800 programme gives you structure, support, and science-backed guidance to avoid common mistakes and build habits that last. With personalised meal plans, health coach support, 450+ workouts, and an engaged community, you have everything you need to succeed.

Ready to start your journey? Start with a 7-day free trial and discover how much easier fasting becomes with the proper support.

What is the biggest mistake people make with intermittent fasting?

The biggest mistake is skipping meals without planning. This often leads to low energy, poor food choices, and giving up too soon. Having a structured programme with meal plans and support makes intermittent fasting far more sustainable and successful.

Can you eat anything while intermittent fasting?

No, food quality still matters. Nutrient-dense meals support better energy and long-term results. The Fast 800 programme focuses on Mediterranean-style eating with whole foods that nourish your body properly during eating windows.

Why do I feel tired during intermittent fasting?

Tiredness during fasting usually comes from dehydration, poor nutrition, or jumping into long fasts too quickly⁶. Staying hydrated, eating well-balanced meals, and easing into fasting can help improve your energy.

Do you have to fast every day for it to work?

Not necessarily. Intermittent fasting can be flexible. Some people fast daily, while others stick to a few days a week. The most effective plan is one that fits your lifestyle and can be maintained consistently over time.