The 40-Day Habit Challenge: How to Transform Your Life with Neuroplasticity and Habit Stacking

Umar M
8 min readMay 6, 2023

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Photo by Ross Findon on Unsplash

We all have habits that shape our lives. Some habits are good, such as brushing our teeth or exercising regularly. Some habits are bad, such as smoking or procrastinating. Habits are powerful because they influence our actions, thoughts, and emotions without us even noticing. They can help us achieve our goals or hold us back from reaching our potential.

But how do we change our habits? How do we create new ones that serve us better? And how long does it take to form a new habit?

You may have heard that it takes 21 days to form a new habit. However, this is a myth that has been debunked by scientific research. According to a study by University College London, it takes an average of 66 days to form a new habit, and the range can vary from 18 to 254 days depending on the person and the habit.

However, there is another number that has a special significance when it comes to human development and transformation: 40. The number 40 has been used in many religious and cultural traditions to represent a period of change, trial, or purification. For example, in Christianity, Jesus fasted for 40 days in the desert before starting his ministry. In Islam, Prophet Muhammad received his first revelation at the age of 40. In Judaism, Moses spent 40 days on Mount Sinai receiving the Torah.

The number 40 also has a biological relevance. The gestation period of a human baby is about 40 weeks. During this time, the fetus undergoes remarkable changes and growth. The first 40 days after birth are also considered crucial for the mother and the baby to recover and bond.

What if we apply the same concept to building new habits? What if we dedicate 40 days to changing and creating new habits that can improve our lives? In this article, we will explore how to build new habits in 40 days using science-based strategies and tips. We will also discuss why the first 40 days are important for your physical, mental, and emotional well-being. By the end of this article, you will have a clear plan and motivation to start your own 40-day habit challenge.

What is a habit and how is it formed?

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A habit is a behavior that we do repeatedly and automatically, often without thinking. Habits are formed through a process called habit loop, which consists of three elements: a cue, a routine, and a reward. A cue is a trigger that reminds us to perform a certain behavior. A routine is the behavior itself. A reward is the benefit or pleasure that we get from performing the behavior.

For example, let’s say you have a habit of checking your phone first thing in the morning. The cue might be your alarm clock or the sunlight coming through your window. The routine is picking up your phone and scrolling through your messages or social media. The reward is the feeling of connection or stimulation that you get from seeing what’s new.

The more you repeat this habit loop, the more it becomes ingrained in your brain. Your brain creates a neural pathway that links the cue, the routine, and the reward together. This makes it easier and faster for you to perform the behavior without much effort or conscious decision.

However, this also means that breaking a bad habit or creating a new one can be challenging. You have to overcome the existing neural pathway and create a new one that supports your desired behavior. This requires time, patience, and consistency.

How to build new habits effectively?

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Now that you know what a habit is and how it is formed, you might wonder how to build new habits that can improve your life. There are many strategies and tips that can help you create and maintain new habits, but one of the most effective ones is called habit stacking.

Habit stacking is a technique that involves attaching a new habit to an existing one. The idea is to use the cue and the reward of your old habit to trigger and reinforce your new habit. This way, you don’t have to rely on your willpower or motivation to perform the new behavior. You simply piggyback on the habit loop that you already have.

For example, let’s say you want to build a new habit of drinking more water throughout the day. You can use habit stacking to link this new habit to an existing one, such as brushing your teeth. You can place a glass of water next to your toothbrush and make it a rule that every time you brush your teeth, you drink a glass of water. The cue is seeing your toothbrush and the reward is having a fresh and clean mouth. By adding the new routine of drinking water, you create a new habit loop that supports your goal.

Habit stacking can help you build multiple new habits by creating a chain of behaviors that follow each other. For example, you can create a morning routine that consists of several habits stacked together, such as:

  • After I wake up, I will meditate for 10 minutes.
  • After I meditate, I will do some stretches for 15 minutes.
  • After I stretch, I will make my bed.
  • After I make my bed, I will have a healthy breakfast.

By using habit stacking, you can create new habits that become part of your daily life without much effort or resistance.

Why are the first 40 days of building a new habit important?

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Building a new habit is not only a matter of repetition, but also of transformation. When you change your habits, you change your brain and your life. This is where the significance of the first 40 days comes in.

The number 40 has been used in many religious and cultural traditions to represent a period of change, trial, or purification. For example, in Christianity, Jesus fasted for 40 days in the desert before starting his ministry. In Islam, Prophet Muhammad received his first revelation at the age of 40. In Judaism, Moses spent 40 days on Mount Sinai receiving the Torah.

The number 40 also has a biological relevance. The gestation period of a human baby is about 40 weeks. During this time, the fetus undergoes remarkable changes and growth. The first 40 days after birth are also considered crucial for the mother and the baby to recover and bond1 .

What if we apply the same concept to building new habits? What if we dedicate 40 days to changing and creating new habits that can improve our lives? According to some experts, this period can help us heal, reenergize, and transform our lives.

One of the reasons is that 40 days is enough time to create new neural pathways in our brains. Neural pathways are the connections between neurons that enable us to perform certain behaviors. The more we repeat a behavior, the stronger the neural pathway becomes. This is how habits are formed and maintained.

However, when we want to change a habit, we have to create a new neural pathway that supports our desired behavior. This requires time, patience, and consistency. According to some studies, it takes an average of 66 days to form a new habit2, but this can vary depending on the person and the habit.

By committing to 40 days of building a new habit, we are giving ourselves enough time to create a new neural pathway that can override the old one. We are also giving ourselves enough time to experience the benefits and rewards of our new behavior. This can motivate us to keep going and make the habit stick.

Another reason why 40 days is important is that it can help us align our habits with our values and goals. When we change our habits, we are not only changing our actions, but also our identity. We are becoming the person we want to be.

By dedicating 40 days to building a new habit, we are making a statement to ourselves and others that we are serious about our change. We are not just trying something out for a few days or weeks. We are committing to a long-term process of growth and transformation.

By doing so, we are also creating a sense of momentum and progress. We are setting ourselves up for success by breaking down our big goal into smaller steps that we can achieve every day. We are also creating a sense of accountability and support by sharing our journey with others who can cheer us on.

The first 40 days of building a new habit can be challenging, but also rewarding. They can help us change our brain and our life for the better.

How to Start Your Own 40-Day Habit Challenge

In this article, we have explored how to build new habits in 40 days using science-based strategies and tips. We have also discussed why the first 40 days are important for your physical, mental, and emotional well-being. By changing and creating new habits, you can change your brain and your life for the better.

Building new habits is not easy, but it is possible. It requires time, patience, and consistency. It also requires a clear vision of who you want to be and why you want to change. By dedicating 40 days to building a new habit, you are giving yourself a chance to heal, reenergize, and transform your life.

Are you ready to start your own 40-day habit challenge? If so, here are some practical suggestions to help you succeed:

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Choose one habit that you want to change or create. Make sure it is specific, measurable, achievable, relevant, and time-bound (SMART).

Use habit stacking to link your new habit to an existing one. Make sure the cue and the reward of your old habit are compatible with your new habit.

Track your progress and celebrate your wins. Use a calendar, a journal, or an app to record your daily actions and achievements. Reward yourself with something that supports your new habit.

Share your journey with others who can support you. Find a friend, a family member, or a community who can cheer you on, hold you accountable, and inspire you.

Be flexible and forgiving. If you miss a day or encounter a setback, don’t give up. Learn from your mistakes and get back on track as soon as possible.

Remember, building new habits is not a sprint, but a marathon. It takes time and effort, but it also brings joy and fulfillment. You have the power to change your habits and change your life. All you need is 40 days to start.

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