
Many people view Monday as the best day to start a diet or kickstart healthy habits. This phenomenon, known as the fresh start effect, suggests that people are more likely to act on their health goals after landmark dates, such as holidays, birthdays, or the beginning of a new week. Monday is often seen as a reset button, providing greater motivation to tackle goals and make a fresh start. However, this can also lead to an all or nothing mentality, where any deviation from the diet is seen as a failure, resulting in a cycle of starting fresh each Monday. While Monday can be a convenient time to start a diet due to its association with the start of a work or school week, it may not be the most effective day for everyone. Some experts suggest that starting a diet on a day when you typically unwind, such as Sunday, can make you feel rewarded rather than punished by the process.
| Characteristics | Values |
|---|---|
| Days people are most likely to start a diet | Monday |
| Reasons | "Fresh start" mentality, opportunity to start over, new beginning, more energy and willpower at the start of the week, a chance to pursue health goals without perfectionism, a chance to break the cycle of unhealthy weekend eating, a chance to start the week with a challenge |
| Downsides | All-or-nothing mentality, higher chance of failure, harder to maintain a healthy diet on Mondays, interruption to sleep patterns, less willpower later in the week |
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What You'll Learn

The 'fresh start effect' and a new beginning
The fresh start effect is a well-known phenomenon where people are more likely to act on their health goals after landmark dates, such as holidays, birthdays, or the beginning of a new month or season. This effect is often associated with the “start fresh Monday” mentality, where people view Monday as a "reset" button and a chance to start anew.
The idea of a fresh start on Monday is appealing because it represents the beginning of a new work or school week, a time when people are typically more motivated and energized to take on new challenges. It is seen as a way to leave behind past failures or unhealthy behaviours and embrace a "new you" with a fresh perspective. This mentality can be beneficial for those who want to incorporate healthy habits into their lives, as it provides a sense of motivation and a clean slate to work towards their goals.
However, the "start fresh Monday" mentality can also have drawbacks. It can lead to an “all or nothing" mindset, where any deviation from perfect healthy eating is seen as a failure, causing people to give up and wait until the next Monday to try again. This cycle of starting and stopping can be frustrating and deflating, leading to a sense of failure and a negative relationship with food and exercise.
To break this cycle, it is important to recognize that perfection in the pursuit of health is not realistic or sustainable. Instead, it is more beneficial to focus on incorporating healthy habits that are enjoyable and flexible. Rather than waiting for Monday to start fresh, it is recommended to make changes as soon as possible, such as at the next meal or the next morning. This immediate action can help prevent the overeating or binge eating that can occur when dieting is constantly delayed until the next Monday.
Additionally, it is crucial to understand that dieting should not feel like a punishment. Starting a diet on a Sunday, when people typically relax and unwind, can be challenging and may set people up for failure. By choosing Monday, which aligns with the start of a busy period, individuals can view their new diet as just one more challenge to tackle during the week.
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People tend to eat more over the weekend
The weekend is a time when people typically have more free time and a less rigid schedule, which can make it challenging to stick to healthy habits. People may indulge in eating out, brunches, pizza, and ice cream, leading to higher calorie intake. Cornell University research supports this, showing that people's weights tend to be lowest on Friday or Saturday and highest on Sunday and Monday.
The "start fresh Monday" mentality arises when individuals feel they have engaged in "bad" behaviours around food or lack of exercise. For example, someone who ate healthily all day but ended with a less nutritious snack might feel they "ruined" their healthy eating for the day. Instead of seeing it as a minor setback, they might give up on their healthy habits for the day and decide to "start fresh" on Monday.
This mindset can lead to a cycle of restricting and overeating, where individuals restrict their eating during the week and then overeat on the weekends. A more sustainable approach is to incorporate flexible healthy habits that allow for occasional indulgences without the guilt and "all or nothing" mentality.
Additionally, starting a diet on Monday can be strategic. It aligns with the start of the workweek or school week, making it a natural time for new beginnings and tackling challenges. It also allows individuals to unwind and relax on Sundays without feeling restricted by a new diet.
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It's the start of a busy period
For many people, Monday marks the start of a busy period. It is the beginning of the work week or the school week, and it can be challenging to start a diet in the middle of a busy week. People often view Monday as a "reset" button and a chance to tackle their goals with renewed motivation.
Starting a diet during a busy period can provide a sense of structure and routine, which may be beneficial for staying on track. It can also help individuals feel more prepared and organized, especially if they have a busy schedule. Planning meals, preparing food in advance, and sticking to a consistent routine can become easier when following a diet during a busy time.
Additionally, a busy schedule may provide a sense of distraction, helping individuals focus less on their dietary restrictions and more on their daily tasks and responsibilities. This can be particularly beneficial for those who struggle with the mental aspect of dieting, such as cravings or feelings of deprivation.
However, it is essential to consider the potential drawbacks of starting a diet during a busy period. Time constraints and increased stress levels may make it challenging to prepare healthy meals or stick to a strict diet plan. Individuals may also experience higher levels of fatigue, which can lead to increased cravings for fatty or carb-heavy foods.
Therefore, while starting a diet on Monday, or at the beginning of a busy period, can provide a sense of motivation and structure, it is crucial to be mindful of potential challenges. Ensuring proper planning, meal preparation, and finding ways to manage stress and fatigue can increase the chances of success when starting a diet during a busy time.
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The 'all or nothing mentality
The "all or nothing" mentality is a common trap that people fall into when trying to improve their health and fitness. This mindset is characterised by a black-and-white approach, where one is either succeeding or failing, with no room for flexibility or nuance. This mentality can lead to an unhealthy relationship with food and exercise, as well as a cycle of starting fresh on Mondays.
When one views healthy behaviours through an "all or nothing" lens, any deviation from perfection is seen as a failure. For example, a person might eat healthily all day but then consider the day "ruined" if they indulge in a treat, such as chips or ice cream. This mindset can lead to feelings of guilt and shame, causing people to throw in the towel and continue indulging with the mindset of "I'll start fresh on Monday". This cycle repeats, with people constantly feeling like they need to start over come Monday, which can be frustrating and demotivating.
The "all or nothing" mentality can also lead to unhealthy eating habits and even disordered eating. When people feel like they have failed or ruined their progress, they may engage in overeating or binge eating as a response to the restriction and deprivation they feel. This can create a vicious cycle of restriction and overeating, which is not only physically unhealthy but can also take a toll on one's mental health and self-esteem.
To break free from the "all or nothing" mentality, it is important to recognise that health and fitness are not black and white. It is possible to strive for progress, not perfection. Instead of viewing any deviation from a diet or exercise plan as a failure, it is healthier to adopt a more flexible mindset that allows for occasional treats and indulgences. This helps to reduce feelings of deprivation and makes it easier to maintain a balanced and sustainable approach to health.
Rather than constantly starting over on Mondays, it is more effective to focus on consistency and long-term behaviour change. This involves incorporating healthy habits into one's lifestyle in a sustainable and enjoyable way. Instead of waiting for the next Monday to roll around, it is better to make small changes at the next meal or the next morning, as suggested by psychologist Ann Kearney-Cooke. This helps to build momentum and avoid the frustration and guilt associated with the "all or nothing" mindset.
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Social support and information
People tend to view Mondays as a chance to “start fresh” and pursue health and diet goals with a “new beginnings” mindset. This phenomenon is known as the “fresh start effect”, where individuals are more likely to act on their health goals after landmark dates, such as holidays, birthdays, or the beginning of a new week.
The idea of starting a diet or healthy habits on a Monday is appealing because it coincides with the start of the workweek or school week for most people. Beginning a diet on a Monday allows individuals to ease into the transition, viewing their new diet as just another challenge to tackle during the week.
However, there are potential drawbacks to this approach. The “all or nothing” mentality associated with Monday diet starts can lead to unhealthy eating habits. If individuals view any deviation from their diet as a failure, they may give up and decide to "start fresh" again the following Monday, creating a cycle of starting and stopping.
To break this cycle, it's important to recognise that a diet should never feel like a punishment. Instead of waiting for Monday to roll around, individuals can adopt a more flexible mindset, focusing on pursuing health without perfection. This involves incorporating sustainable and enjoyable healthy habits into their lives that don't make them feel like a failure if they stray from their diet occasionally.
Additionally, individuals can benefit from social support and information when making dietary changes. Support from family, friends, or a community of like-minded individuals can provide encouragement and accountability. Information and resources from reliable sources can also help individuals make informed decisions about their diet and health choices. By combining social support with accurate information, individuals can increase their chances of success in achieving their health and fitness goals.
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Frequently asked questions
Monday is the start of a new work week or school week for most people, and it is seen as a reset button and a great source of motivation to tackle new goals.
Humans like to be reminded of new beginnings or meaningfully important dates, and starting afresh health-wise midway through the week does not provide the same psychological boost as starting at the beginning of a new week or month.
People can use up all their energy and willpower at the beginning of the week, leading to burnout later on. Also, if you have had a busy weekend, you are more likely to have had less sleep and worse quality sleep, and when the body is tired, it craves fatty carbs, making it harder to stick to a healthy diet. Additionally, the all-or-nothing mentality that comes with starting a diet on Monday can lead to unhealthy eating habits overall.











































