
Crash dieting can have long-term negative effects on your body and mind, slowing down your metabolism and causing muscle breakdown, a compromised immune system, cardiac issues, and damaged hair and skin. It can also lead to a cycle of yo-yo dieting, where you rapidly lose and regain weight, making it even more difficult to maintain your weight in the future. To repair your metabolism after crash dieting, it is important to focus on increasing your metabolic rate through a combination of dietary and lifestyle changes. This includes incorporating physical activity and resistance training into your routine, improving sleep quality, managing stress, and consuming a balanced diet rich in plant-based foods, dietary fiber, and probiotics.
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What You'll Learn

Increase your calorie intake
After a crash diet, your metabolism may stay sluggish, and you may regain the weight you lost and even gain more weight. This is due to a reduction in metabolic rate, which makes it easier to regain weight. To break this cycle, you need to focus on practical ways to increase your metabolic rate and restore it to a healthier state.
Reverse dieting is a method that involves slowly increasing your calorie intake after a restrictive diet to boost metabolism and prevent weight regain. It requires strict monitoring of calorie intake and body weight goals. While there is insufficient evidence to support that reverse dieting increases metabolism, one study revealed that women who suffered from long-term exercise-associated amenorrhea saw improvements in their metabolic rate after 10 weeks of increased calorie intake. This time frame will vary depending on how long a person has been dieting.
Consuming too few calories will likely slow down your metabolism as your body will conserve energy and burn fewer calories throughout the day. Eating only 1200 calories per day is not a sufficient calorie intake for adults. Chronic dieting can slow down your metabolism as your body adapts to hold on to energy and use fewer calories.
To reset a damaged metabolism, stop dieting, consume a variety of foods, and incorporate resistance training.
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Get more sleep
Getting enough sleep is essential for your metabolism. Sleep is just as important to your success as nutrition and activity levels. Even small increases in activity can make a big difference in fat loss efforts. Aim for 3-5 hours per week of purposeful activity.
Sleep disturbances are one of the signs of a slow metabolism. Ongoing fatigue is another symptom of a slow metabolism.
When you're sleep-deprived, your body produces more of the stress hormone, cortisol, which increases inflammation and slows down your metabolism.
Getting enough sleep is crucial for managing stress and keeping your metabolism healthy. Aim for 7-9 hours of sleep each night to support your body's natural metabolic processes and overall health.
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Manage your stress
Crash dieting can negatively affect your body's thyroid function and slow down your metabolism. During and after crash dieting, the body's stress hormone, cortisol, increases, creating inflammation, slowing metabolism, and making the body more effective at storing fat. Therefore, managing your stress is an important part of increasing your metabolism after a crash diet. Here are some ways to manage your stress:
Identify Stressors
The first step in managing stress is identifying the sources of stress in your life. While it may be easy to pinpoint major stressors, like changing jobs or moving, finding the root cause of chronic stress can be more complicated. Take some time to reflect on your daily routine, interactions, and thoughts to identify patterns that contribute to your stress levels. Once you have identified these patterns, you can start to address them and make changes to reduce their impact on your life.
Practice Relaxation Techniques
Relaxation techniques such as yoga, meditation, and deep breathing activate the body's relaxation response, which is the opposite of the fight-or-flight stress response. As you learn and practice these techniques, your stress levels will decrease, and your mind and body will become calmer and more centred. Make sure to also get enough sleep, as fatigue can increase stress levels and impact your metabolism. Aim for 7-9 hours of quality sleep per night and practice good sleep hygiene.
Adopt a Healthy Diet
Well-nourished bodies are better equipped to cope with stress. Start your day with a nutritious breakfast, and continue to fuel your body with balanced meals throughout the day. Reduce your caffeine and sugar intake, as the temporary "highs" they provide often end with a crash in mood and energy. Instead, opt for a diet rich in whole foods, lean proteins, and healthy fats. This will help counteract the negative effects of stress on your weight and metabolism.
Engage in Regular Physical Activity
Exercise is a great way to reduce stress and promote the release of endorphins, improving your mood. It also helps to balance hormones and increase your metabolism. High-intensity interval training (HIIT) and weight lifting can be particularly effective for building muscle, which is more metabolically active than fat.
Seek Support
Chronic stress can significantly impact your physical and mental health, so it's important to seek support when needed. Reach out to friends and family, or consider consulting a therapist or counsellor. They can offer personalized strategies for managing stress and provide emotional relief, helping you to effectively manage stress and reduce its impact on your weight and metabolism.
Remember, stress management is a highly individualized process, and it may take some experimentation to find the techniques that work best for you. The key is to be proactive, address the sources of your stress, and make your overall well-being a priority.
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Eat more fibre
Eating more fibre is a great way to increase your metabolism after a crash diet. Fibre is a type of carbohydrate that cannot be digested by the body. It is important to include fibre in your diet as it helps to maintain a healthy gut and regular bowel movements. Fibre also helps you feel full and satisfied after meals, which can aid in weight loss and management.
There are two types of fibre: insoluble and soluble. Insoluble fibre does not dissolve in water and helps to add bulk to your stool, which can prevent constipation and other digestive issues. Good sources of insoluble fibre include whole grains, nuts, seeds, and vegetables such as carrots, celery, and tomatoes. Soluble fibre, on the other hand, dissolves in water to form a gel-like substance. It helps to lower blood cholesterol and glucose levels and can be found in oats, beans, citrus fruits, and barley.
After a crash diet, your metabolism may be sluggish, and you may be more susceptible to weight gain. By including more fibre in your diet, you can help to regulate your weight and improve your digestive health. Fibre-rich foods tend to be more filling, which can help you eat less and prevent overeating. Additionally, fibre slows down the absorption of sugar and starch, which can help maintain stable blood sugar levels and reduce cravings.
To increase your fibre intake, aim to incorporate a variety of whole foods into your diet. Choose fruits and vegetables that are rich in fibre, such as avocados, berries, apples, and leafy greens. Legumes, such as beans, lentils, and chickpeas, are also excellent sources of fibre. You can also experiment with ancient grains like quinoa, farro, and buckwheat, which provide more fibre than refined grains.
Remember, it is important to increase your fibre intake gradually to give your body time to adjust. Staying properly hydrated is also crucial when consuming more fibre, as it helps the fibre move through your digestive system more easily. By eating more fibre, you can support your digestive health, regulate your weight, and boost your metabolism after a crash diet.
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Drink more water
Drinking more water is a simple yet effective way to boost your metabolism after a crash diet. Water is a calorie-free beverage that plays a crucial role in almost every bodily function, and proper hydration is key to a healthy metabolism.
Firstly, drinking water can stimulate thermogenesis, or heat production, in the body. Chilled water is especially beneficial, as the body has to work harder to warm the fluid to body temperature, thereby increasing metabolism. A 2003 study published in the Journal of Clinical Endocrinology & Metabolism found that consuming approximately two cups of water at 71°F led to a 30% increase in the metabolic rates of healthy adults. Similarly, a 2013 study showed that girls with excess weight who drank two cups of water before breakfast, lunch, and dinner without any other dietary changes lost weight and experienced reductions in their body mass index and body composition scores.
Drinking water may also increase lipolysis, the process by which the body burns fat for energy. A 2016 mini-review of animal studies suggested that mild dehydration decreases lipolysis, possibly due to hormonal changes, while water intake can enhance this process. Additionally, water may improve motivation and reduce stress, leading to healthier decision-making.
Water can also help suppress your appetite and make exercise more efficient. Opting for water instead of sugary drinks or juice can significantly reduce your overall liquid calorie intake, contributing to weight loss.
It is important to note that while water plays a crucial role in boosting metabolism and supporting weight loss, it should be combined with other healthy habits and a well-rounded diet to achieve long-term, sustainable results.
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Frequently asked questions
A slow metabolism is not permanent, and with the right changes to your diet and lifestyle, you can give it a boost. Here are some ways to do that:
- Get enough sleep. Sleep deprivation disrupts the balance of hormones in the body, which can slow down your metabolism. Aim for 7-9 hours of sleep each night and maintain a regular sleep schedule.
- Manage your stress. Chronic stress increases the release of hormones like cortisol, which can slow down your metabolism. Try incorporating stress management techniques like deep breathing, meditation, and joyful movement into your daily routine.
- Eat more fibre. Consume more dietary soluble fibre, found in foods like carrots, oats, beans, apples, citrus fruits, and barley.
- Drink more water. Staying hydrated allows your body to complete tasks more efficiently, including converting food to energy. Aim for 16.9 ounces (a little over 2 cups) of water multiple times a day.
- Exercise regularly. Resistance training and strength training can help build muscle and increase your metabolic rate. Aim for at least 150 minutes of intense training per week.
Crash diets can slow down your metabolism, leading to a vicious cycle of weight loss and gain, also known as "yo-yo dieting". This is because crash diets:
- Reduce muscle mass, which lowers metabolic health rates.
- Cause muscle breakdown at a higher rate than a normal, healthy diet and exercise regime.
- Increase the stress hormone cortisol, which can create inflammation, slow metabolism, and make your body more effective at storing fat.
- Cause a leptin drop or leptin resistance, making you feel hungrier and more likely to eat more.
Some signs that your metabolism has slowed down include:
- Fatigue
- Feeling cold
- Constipation
It's hard to say exactly how long it takes for metabolism to recover, as it varies from person to person. One study found that women who had suffered from long-term exercise-associated amenorrhea saw improvements in their metabolic rate after 10 weeks of increased calorie intake.
Instead of crash dieting, focus on making sustainable changes to your diet and lifestyle. Here are some tips:
- Eat a balanced diet rich in plant-based foods, fibre, and lean protein.
- Exercise regularly and incorporate strength training or resistance training to build muscle and boost your metabolic rate.
- Get enough sleep and manage your stress levels.
- Stay hydrated by drinking plenty of water throughout the day.











































