
It is common to experience weight gain after starting a new fitness routine, and this can be due to water retention. Water retention can be caused by a number of factors, including microscopic muscle tears, dehydration, inflammation, and the body's storage of glycogen. When you begin building muscle, your body may retain water as a healing response to the micro-tearing of muscle fibres. This, along with better blood flow, can cause swelling in the muscles. This is a normal part of the recovery process and is only temporary.
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What You'll Learn

Muscle tears and inflammation
Gaining weight after starting a workout routine is a common occurrence. This is because muscle building can cause water retention in the body. When you start exercising regularly, your body stores glucose in your muscles in the form of glycogen, which binds with water, leading to initial water weight gain. This effect is usually short-lived and should disappear within a few weeks to a month.
Muscle strains, or pulled muscles, are common injuries that can occur during physical activity. They are caused by overstretching or tearing of the muscle fibres, which can range from mild to severe. Mild strains may only break a few tiny fibres, while severe strains can result in a complete tear of the muscle. Most muscle strains can heal with time and rest, but severe tears may require medical care or surgery.
To promote healing and reduce inflammation, it is recommended to increase your fluid intake, as dehydration can also contribute to water retention. Massages, anti-inflammatory medications, and certain supplements like algae oil or potassium-rich foods can also help improve lymph flow and reduce swelling. Remember that building muscle may cause weight gain on the scale, but it does not mean you are becoming less fit. Muscle occupies less space than fat, and it burns more calories, leading to a leaner and healthier body over time.
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Dehydration
To avoid dehydration, it is recommended to consume at least one gallon of water per day, and potentially more depending on your weight, occupation, and climate. For instance, in a humid climate like Florida, you might need 1.5 gallons per day. It is also suggested to add extra natural electrolytes to your water and lightly season your meals with sea salt to help improve fluid retention within the muscles.
Alcohol should be avoided as it dehydrates the body and leads to a water-storing reaction to compensate for the lost liquids, which can also cause water retention.
It is important to note that water retention due to strength training is a normal part of the recovery process. When microscopic tears occur in your muscle fibers from lifting weights, the muscles may swell slightly and retain fluid for a few days after the exercise. This is separate from dehydration-induced water retention, which can be avoided by staying properly hydrated.
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Cortisol release
Cortisol is a steroid hormone that is produced by the body's adrenal glands. It is often referred to as the "stress hormone" as it is released in response to stress. Cortisol has several functions in the body, including regulating metabolism and immune function, and it plays a key role in the body's "fight or flight" response to danger.
When it comes to water retention, cortisol can indeed have an impact. Chronic stress can lead to elevated cortisol levels, which in turn can cause the body to retain water. This is because cortisol stimulates the production of aldosterone, a hormone that regulates water balance and can lead to fluid retention, especially in the legs. This is often referred to as "stress-induced water retention".
Additionally, cortisol can also affect weight gain and loss. High cortisol levels can interfere with the body's ability to turn off the stress response, leading to increased fat storage, especially in the belly area. This is because fat cells in the abdominal region contain more cortisol receptors, and when these cells release cortisol, it further potentiates fluid retention.
Furthermore, intense or excessive exercise can also contribute to increased cortisol levels, which can then lead to water retention. This is particularly true if the body is already under stress from other factors, such as mental stress, a calorie deficit, or inadequate recovery. In this case, reducing the frequency and intensity of workouts and incorporating rest and relaxation can help manage cortisol levels and reduce water retention.
It is important to note that while cortisol can contribute to water retention, there are also other factors at play, such as diet, dehydration, and the type of exercise performed. Addressing these factors and finding healthy ways to manage stress can help reduce the impact of cortisol on water retention and overall health.
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Glycogen storage
When you start exercising regularly, your body keeps reserves of glucose in the form of glycogen in your muscles. This is so that your body can easily access fuel when you work out again. Glycogen is stored in the liver, muscles, and fat cells in a hydrated form (three to four parts water) associated with potassium. Each gram of glycogen is stored in human muscle with at least 3 g of water.
Glycogen is the body's stored form of glucose, which is sugar. When you eat a carbohydrate-containing meal, your blood glucose level rises. This signals the pancreas to produce insulin, a hormone that helps the body's cells take up glucose from the bloodstream for energy or storage. Insulin causes the liver and muscle cells to produce an enzyme called glycogen synthase, which links chains of glucose together.
Glycogen is the body's primary and preferred source of energy. When your body doesn't need fuel, the glucose molecules are linked together in chains of eight to 12 glucose units to form a glycogen molecule. The amount of glycogen stored in your cells can vary depending on your activity level, how much energy you burn at rest, and the types of food you eat. Low-carb and ketogenic diets, as well as strenuous exercise, deplete glycogen stores, causing the body to metabolize fat for energy.
When your glycogen stores are depleted, you may feel fatigued and sluggish and experience mood and sleep disturbances. Athletes may experience a sudden decrease in performance, commonly known as "hitting the wall". To avoid this, athletes may consume glucose gels or energy chews containing glycogen before or during endurance events to increase blood glucose levels. However, consuming excessive amounts of carbohydrates before an endurance event can lead to excess water weight and digestive issues.
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Diet and nutrition
When it comes to diet and nutrition, there are several factors that can contribute to water retention when building muscle. Firstly, it's important to understand that glycogen, which is stored in the muscles as a source of energy, binds with water. Therefore, when you start a new workout routine, your body will store more glycogen, leading to an increase in water weight. This is a normal physiological response, and the weight gain is typically temporary and short-lived.
Secondly, your diet can play a significant role in water retention. Consuming a large amount of sodium or salt in your diet can induce water retention. This is because sodium is well-absorbed by cells, and it brings water along with it, causing cells to temporarily retain water. Therefore, reducing your sodium intake may help mitigate water retention.
Additionally, cortisol, a hormone produced in response to stress, can also influence water retention. When you experience mental stress, a calorie deficit, or overly intense or frequent workouts, your cortisol levels may rise. High cortisol levels can impact your fluids and cause your body to retain water. Engaging in stress-reducing activities, such as relaxation techniques, napping, listening to music, or drinking tea, may help lower cortisol levels and potentially reduce water retention.
Furthermore, it's important to maintain proper hydration when building muscle. Dehydration can also contribute to water retention. When you begin an exercise program, your fluid intake needs increase due to fluid loss through perspiration. Ensuring you replace lost fluids by drinking adequate water can help prevent dehydration-related water retention.
Lastly, when choosing supplements to support muscle building, it's crucial to read nutrition labels carefully. Some supplements may contain high amounts of sugar and fat, which can contribute to caloric excess. Aim for a balanced intake of protein, carbohydrates, and healthy fats to support muscle building without interfering with your water retention or weight loss goals.
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Frequently asked questions
Water retention after a workout is caused by microscopic tears in muscle fibres, which is a normal part of the muscle-building process. This can cause inflammation and swelling of the muscle tissues, leading to fluid retention.
The length of water retention varies from person to person but is usually brief, lasting a few days to a few weeks.
To reduce water retention, it is important to stay hydrated, eat a balanced diet, and get regular exercise. It is also recommended to eat a combination of protein and carbs to fuel and help build and repair muscles.










































