Dante Carrillo
Losing weight is a common goal, but it's important to be aware of the potential risks to your health. When you go on a diet, you don't just lose fat—you also lose muscle mass. This can have repercussions for your fitness, strength and metabolism. The faster you lose weight, the more muscle you will lose, and the more negative health consequences you may experience. However, there are strategies you can use to avoid losing muscle during a fat loss phase, such as eating a sufficient amount of protein and doing strength-building exercises.
| Characteristics | Values |
|---|---|
| Muscle loss when dieting | Likely |
| Muscle loss prevention | Resistance training, endurance training, balanced diet with sufficient protein |
| Muscle loss likelihood factors | Ethnicity, genetics, weight loss speed, weight loss amount, protein intake |
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What You'll Learn
Resistance training prevents muscle loss
When dieting, it is likely that you will lose muscle mass as well as fat. This is because dieting creates a calorie deficit, where the body does not get enough energy from food to meet its energy needs. As a result, it slows down your metabolism, impacting your ability to maintain your weight in the long term.
However, resistance training can help prevent this muscle loss. Resistance training is based on the principle that muscles will work to overcome a resistance force when required to do so. It increases muscle strength and tone, and when done repeatedly and consistently, your muscles become stronger. It can also help prevent osteoporosis and increase bone density and strength.
A well-rounded fitness program includes resistance training to improve joint function, bone density, muscle, tendon and ligament strength, as well as aerobic exercise for heart and lung fitness. Resistance training does not have to be done in a gym and can be done using free weights, weight machines, resistance bands, or your own body weight.
Research has shown that resistance training prevents almost 100% of muscle loss from calorie restriction in obese elderly individuals. This is achieved by restoring depressed rates of myofibrillar protein synthesis induced by calorie restriction. It is recommended that adults do muscle-strengthening activities on at least two days each week.
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High protein intake preserves muscle
Losing weight can be a tricky process, and it is common to lose muscle mass along with body fat. This can slow down your metabolism, which in turn slows the rate at which you lose weight and impacts your ability to maintain your weight in the long term.
To prevent this, it is important to consume adequate amounts of protein. Protein is essential for building and maintaining muscle mass, and research shows that it helps prevent muscle loss when following a calorie-restricted diet. A net positive nitrogen balance is required to build muscle, as protein is high in nitrogen. This means that a person must consume more protein than what is broken down. If not, the body will break down muscle to provide itself with the amino acids needed to support body functions and preserve other tissues.
Several studies have found that higher protein intakes are associated with improvements in lean body mass and strength when combined with resistance training. For example, a study by the University of Birmingham's School of Exercise Sciences found that athletes who substituted protein for carbs and fat lost fat without losing muscle mass. The optimal amount of protein required to build muscle is still debated, but it is generally agreed that healthy adults can safely tolerate a long-term protein intake of up to 2 g per kg of body weight per day without any side effects. The 2020-2025 Dietary Guidelines for Americans recommend that most healthy adults over 19 years old get between 10-35% of their daily calories from protein.
It is important to note that a balanced diet is crucial, and meals should include a source of protein, wholegrain carbs, and healthy fats. Strength-building exercises are also essential to preventing muscle loss.
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Ethnicity and genetics influence muscle loss
Losing weight through dieting can result in a significant loss of muscle mass. This is because dieting creates a calorie deficit, where the body does not get enough energy from food to meet its energy needs. As muscle is an important factor in determining our metabolic rate, losing muscle mass slows our metabolism, impacting our ability to maintain our weight long-term.
Ethnicity and genetics can also influence muscle loss. Several studies have found ethnic differences in body composition, which are likely reflected in skeletal muscle (SM) differences. For example, data from a multi-ethnic sample of adults in the New York City area revealed a high density of resources for physical activity, which is an important factor influencing individuals' physical activity behaviours. However, it is unknown whether a higher level of physical activity was present in the sample.
In addition, ethnic diversity affects anthropometric measures, which in turn may affect the parameters used for the definition of sarcopenia, or age-related loss of SM, strength, and function in old age. For instance, a study compared data from community-living older people from different Asian locations and ethnicities, including Chinese in Beijing, Hong Kong, Singapore, Japanese, and Malays and Indians in Singapore, to explore variations in body mass index, muscle mass, grip strength, walking speed, and chair stand times. Similar data from a Caucasian population was used for comparison.
Genetics also plays a role in muscle mass and function. Transgenic mouse models have helped identify genes where variations in the DNA sequence influence traits including muscle mass and function. For example, the Mstn gene has been linked to increased muscle mass and strength in humans.
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Rapid weight loss leads to muscle loss
Losing weight is challenging, and it's natural to want to see quick results. However, rapid weight loss can result in a significant loss of muscle mass, not just fat. This loss of muscle mass is called sarcopenia. As muscle mass diminishes, so do strength, stamina, and resting metabolic rate.
Muscle is an important factor in determining our metabolic rate – that is, how much energy we burn at rest. Muscle is more metabolically active than fat, meaning it burns more calories. When we diet to lose weight, we create a calorie deficit, where our bodies don't get enough energy from food to meet our energy needs. This can lead to a decrease in calorie-burning muscle mass, which slows our metabolism. A slower metabolism quickly slows the rate at which we lose weight and impacts our ability to maintain our weight loss in the long term.
To prevent muscle loss, it's important to ensure your diet is balanced and includes adequate protein, wholegrain carbs, and healthy fats. Strength-building exercises are also essential to retaining muscle mass. Resistance training, in particular, has been shown to prevent almost 100% of muscle loss from calorie restriction. Weight-bearing exercises that build muscle are important, but you don't necessarily need to hit the gym – bodyweight exercises like push-ups, pull-ups, planks, and air squats can be just as effective as lifting weights.
In addition to diet and exercise, certain medications can also help prevent muscle loss. Drug manufacturers are currently developing medications to boost muscle metabolism and metabolic function, as well as medications to block the signaling pathways that lead to muscle loss.
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Calorie deficit and muscle maintenance
When you are on a low-calorie diet, your body will start to break down muscles for energy. This can lead to a decrease in strength and endurance, making it more challenging to lose fat. This condition is known as sarcopenia. As muscle mass diminishes, so do strength, stamina and resting metabolic rate.
To avoid this, ensure that you eat enough protein and do strength-building exercises. This will help you retain muscle mass and ensure that your body burns fat, not muscle. The recommended intake for someone trying to lose weight is 0.36-0.73 grams of protein per pound of body weight (0.8-1.6 grams per kilogram). For example, a 160-pound (72.5kg) person would need 58-116 grams of protein per day. It is also important to note that the quality of the protein matters. Animal protein sources, such as meat, poultry, and fish, are generally superior to plant-based proteins in terms of their amino acid composition. Certain amino acids are needed for muscle growth and maintenance, and animal proteins tend to be richer in these essential amino acids.
In addition to eating enough protein, it is important to focus on healthy eating and making lifestyle changes that will help you sustain your weight loss in the long term. This includes getting enough rest and sleep. Your body repairs and rebuilds muscle tissue when you sleep, so make sure you are getting 7-8 hours of sleep per night. It is also important to not overdo your calorie deficit. Slower weight loss reduces the lean mass you lose, including muscles and soft tissue. To prevent muscle loss, you can cycle your calories every few months. This means eating at maintenance or even slightly above for a month or two, and then getting into a calorie deficit.
If your goal is to lose fat and build muscle, it is important to find a balance in your routine. This includes eating enough protein, not overdoing the calorie deficit, and exercising using resistance training. Resistance exercises use opposing force to muscle contraction to stimulate building muscle. Examples of resistance exercises include lifting weights, using exercise bands, bodyweight exercises, and exercise equipment.
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Frequently asked questions
It is very likely that you will lose muscle when dieting, especially if you lose weight rapidly. However, the amount of muscle lost varies from person to person and depends on factors such as ethnicity and genetics.
To prevent muscle loss, it is recommended to maintain a balanced diet with sufficient protein intake. Resistance training and weight-bearing exercises that build muscle are also effective in preventing muscle loss.
Losing muscle mass can negatively impact your fitness, strength, and metabolism. It can also lead to a condition called sarcopenia, which is characterised by a loss of muscle mass and strength.
Dual-energy X-ray absorptiometry (DXA) scans are considered the most accurate way to measure muscle mass. However, they can be expensive and may not be easily accessible. Smart scales designed to measure muscle mass are also available, but their accuracy is questionable.
If you are losing muscle, you may experience decreased strength, stamina, and metabolic rate. Additionally, rapid weight loss can be a sign that you are losing both fat and muscle mass.
