Brenda Khan
Feeling tired after starting a new diet is a common side effect of dieting. This could be because your body is adjusting to a new fuel source, a decrease in caffeine and sugar intake, or a change in your exercise routine. It is important to monitor your sleep, water intake, and eating habits, as these can also contribute to how energetic or sluggish you feel. If you are still feeling tired after a few weeks, it may be helpful to consult a doctor to rule out any underlying health issues.
| Characteristics | Values |
|---|---|
| Feeling tired when starting a diet change | Normal |
| Reasons | Decreased energy intake, reduced caffeine and sugar intake, increased physical activity, stress, insufficient nutrients, sleep deprivation, blood sugar spikes and crashes, decreased red meat intake, decreased carbohydrate intake |
| Recommendations | Increase calories, eat more frequently, choose high-energy foods, ensure adequate sleep, monitor blood sugar levels, include iron-rich foods, consume complex carbohydrates |
| When to seek help | If fatigue persists or worsens, or if unexplained weight loss accompanies tiredness |
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What You'll Learn
The body needs time to adjust to a new diet
It is normal to feel tired when starting a new diet, and this fatigue can have several causes. Firstly, your body needs time to adjust to a new diet and energy source. If your new diet involves reducing your calorie intake, your energy levels can plummet, leaving you feeling tired. This is especially true if you are also increasing your physical activity levels, as your body will need time to adjust to the new demands placed on it.
Secondly, a change in diet can affect your blood sugar levels, which can impact your energy levels. Eating small meals or snacks every two to four hours can help keep blood sugar levels steady and prevent fatigue. Additionally, choosing a breakfast with fibre can protect against blood sugar spikes and crashes later in the day.
Thirdly, a new diet may result in a reduction of certain nutrients or food groups, such as carbohydrates or iron, which can lead to decreased energy levels. For example, red meat is a great source of iron, and without this mineral, your body cannot circulate enough oxygen to fuel your cells, leading to feelings of tiredness. Similarly, your body needs grains to function well and avoid feeling sleepy.
Finally, the stress of starting a new diet and the pressure to lose weight can cause anxiety and increased levels of the stress hormone cortisol, which can lead to fatigue. Additionally, liquid diets or very low-calorie diets can cause stress because you no longer experience the satisfaction of eating a meal. It is important to note that chronic elevations in cortisol can cause unhealthy changes in your body, such as higher blood pressure and decreased immunity.
While it is normal to feel tired when starting a new diet, this fatigue should not persist. If you continue to feel tired, it may be a sign of malnutrition or an underlying medical condition, and you should consult a doctor.
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A diet with a variety of foods is important
It is normal to feel tired when starting a new diet. This is because your body is adjusting to a new fuel source and a lower intake of calories. It can also be a result of cutting down on caffeine and sugar. This tiredness usually goes away after a week or two, but if it persists, it may be a sign of malnutrition or a symptom of an underlying medical condition.
Secondly, a varied diet promotes gut health. Eating a wide range of foods exposes you to a greater diversity of healthy bacteria, which can protect against obesity, reduce allergies, and enhance immunity.
Thirdly, a diet with a variety of foods can help prevent certain health conditions. The traditional diets of some of the healthiest populations in the world, such as the Greeks and Japanese, differ widely, but they have food variety in common. Eating a mix of foods from different groups may help lower the risk of heart disease, metabolic syndrome, and cancer.
Finally, a varied diet can make healthy eating more enjoyable and sustainable. Eating the same meals repeatedly can make a healthy diet seem boring and unappealing in the long term. By mixing up your food choices and experimenting with different cuisines and cooking methods, you are more likely to stick with healthy eating and make progress towards your goals.
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Calorie restriction can cause fatigue
It is normal to feel tired when starting a diet change. This is because a diet change often involves restricting calories, which can lead to a decrease in energy levels. Calorie-deficit fatigue is a common side effect of overzealous dieting, and it can be dangerous if calorie intake becomes too low. Harvard Health Publishing warns that ingesting less than the minimum daily recommended calories will cause calorie-deficit tiredness.
When you reduce your calorie intake, you also limit your energy intake. This can be a reason why you feel tired, especially if you are also increasing your physical activity. This can be normal when starting a new diet, but it should eventually make you feel more energized, especially if you are following a well-balanced diet that provides all the nutrients your body needs.
To prevent fatigue, it is important to eat enough food daily to meet your energy requirements. This includes ensuring you are getting enough carbohydrates, which are the body's main source of energy. Eating small, frequent meals can help give the brain a steady supply of nutrients and prevent sluggishness. It is also important to get enough protein and healthy fats, which are also important for energy.
In addition, it is crucial to be mindful of the type of diet you are following. Restrictive diets can be stressful and anxiety-inducing, which can lead to extreme fatigue. It is important to set realistic goals and not restrict your calorie intake too severely, as this can lead to nutrient deficiencies and negatively affect your health in the long term.
If you find yourself feeling tired after starting a new diet, give your body some time to adjust. It can take a few weeks for your body to adapt to a new diet and exercise routine. However, if you still feel tired after a few weeks, it may be a good idea to check in with a doctor to rule out any underlying medical conditions or nutrient deficiencies.
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Exercise can make you tired when starting a new diet
It is normal to feel tired when starting a new diet and exercise regimen. This fatigue could be due to several factors, including the diet itself and the amount and intensity of exercise.
Diet
A diet that is too restrictive can be stressful and anxiety-inducing, leading to extreme fatigue. By reducing your food intake, you are also limiting your energy intake, which can be a reason for feeling tired, especially if you add physical activity to your daily routine.
A well-rounded diet that provides all the necessary micro and macronutrients is essential for maintaining energy levels. For example, a diet lacking in carbohydrates can lead to decreased energy and cognitive function. Similarly, a diet low in iron can lead to exhaustion, as iron is essential for strength and stamina.
Exercise
Exercising too much without adequate rest can lead to post-exercise fatigue. This is known as overtraining, where the body does not have enough time to recover between workouts. It is important to listen to your body and allow for proper recovery, which includes getting enough sleep.
Adaptation
Feeling tired when starting a new diet and exercise regimen can also be a sign that your body is adapting to these changes. It may take a few weeks for your body to adjust, but eventually, most people will start to feel better and more energized.
In summary, it is normal to feel tired when starting a new diet and exercise regimen due to factors such as dietary changes, exercise intensity, and the body's natural adaptation process. However, if fatigue persists or becomes concerning, it is important to consult a doctor or healthcare professional.
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Lack of sleep can be a factor in tiredness
Diet changes can be stressful and anxiety-inducing, which can lead to fatigue. This is especially true if you are not consuming enough calories for your level of physical activity. Restricting your calorie intake can put your body into ""starvation mode", causing it to store more calories as fat and leaving you feeling tired.
In addition, a well-rounded diet provides us with enough energy to get through the day, and a lack of certain nutrients can cause fatigue. For example, not getting enough iron can cause tiredness, as your body won't be able to circulate enough oxygen to fuel your cells. Similarly, a lack of vitamin B12 or vitamin D could be the culprit, as these vitamins often give people an energy boost.
If you are experiencing tiredness, it could be due to a lack of quality sleep. Sleep deprivation can be caused by various factors, including sleep apnea, mental health issues, medications, and short-term illnesses. It can also be caused by overconsumption of caffeine, which can harm your sleep cycle.
If you are feeling tired, it is important to identify the underlying cause and make appropriate adjustments to your lifestyle or diet. If you are experiencing inexplicable weight loss alongside tiredness, this could indicate an underlying medical condition, and you should consult a doctor.
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Frequently asked questions
Yes, it is normal to feel tired when starting a diet change. Your body is adjusting to a new fuel source, and it takes some time for it to get used to the change.
It is important to ensure that you are getting enough calories, drinking enough water, and getting enough sleep. You should also be mindful of the types of food you are eating. For example, eating too many refined carbs can make you feel sluggish.
It is important to eat a well-rounded source of fibre-rich and complex carbohydrates. You should also eat foods that are high in protein and low in glycemic carbohydrates, such as Greek yoghurt, berries, and whole-grain crackers.
It usually takes a few weeks for your body to adjust to a new diet. If you are still feeling tired after a few weeks, you should consult a doctor as the tiredness may be caused by an underlying health issue.
