Brenda Khan
Energy-restricted diets, also known as calorie-restricted diets, are dietary regimens that reduce energy intake from food and beverages without causing malnutrition. The goal of an energy-restricted diet is to achieve weight loss without nutritional deficiencies. This type of diet is typically recommended for overweight or obese individuals and has been shown to have potential health benefits, such as improved cardiovascular health and longevity. Intermittent energy restriction (IER) is a variation of this diet that involves alternating between periods of calorie deficit and normal eating patterns, which has been found to aid weight loss and positively impact the gut microbiome and brain activity. The effectiveness of energy-restricted diets has been studied in both human and animal models, with research indicating potential benefits for weight management and aging.
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What You'll Learn
Intermittent energy restriction (IER)
An energy-restricted diet is a dietary regimen that reduces energy intake from food and beverages without causing malnutrition. Calorie restriction, or energy restriction, is recommended for people with diabetes, prediabetes, and those who are overweight or obese.
IER has been shown to be an effective strategy for weight loss, with studies reporting an average weight loss of 0.2-0.8 kg per week, comparable to that of CER. It has also been found to positively impact the gut microbiome and brain activity, reducing activity in brain regions involved in the regulation of appetite and addiction.
However, IER may not be suitable for everyone, particularly individuals with type 1 or 2 diabetes or a history of disordered eating. It is important to consult with a healthcare professional before starting any new diet plan.
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Weight loss
An energy-restricted diet is a dietary regimen that reduces energy intake from food and drinks without causing malnutrition. It is also known as calorie restriction or caloric restriction. This type of diet is typically recommended for people who are overweight or obese and are looking to lose weight. The goal of an energy-restricted diet is to achieve a negative energy balance, where the number of calories consumed is less than the number of calories burned, resulting in weight loss.
The amount of calorie restriction can vary depending on the individual's needs and goals. For example, the Verdify diet recommends a calorie restriction of 600 kcal per day. It is important to note that energy-restricted diets should be designed to include essential nutrients to prevent malnutrition, which can have serious negative consequences, as seen in studies such as the Minnesota Starvation Experiment.
Intermittent energy restriction (IER) is a specific type of energy-restricted diet that has gained popularity as an effective weight loss strategy. IER involves alternating between periods of calorie restriction and periods of normal or maintenance calorie intake. This method has been shown to be as effective as continuous energy restriction diets in promoting weight loss while also improving metabolic parameters and gut microbiome health. IER may be particularly beneficial for overweight or obese individuals who struggle with consistently maintaining an energy deficit on traditional diets. By periodically returning to normal eating patterns, individuals may experience reduced feelings of lethargy, tiredness, and hunger, making it easier to stick to the diet and achieve their weight loss goals.
It is important to note that energy-restricted diets, including IER, should be approached with caution and under the guidance of a healthcare professional or experienced dietitian. While these diets can be effective for weight loss, they may not be suitable for everyone, especially those with certain medical conditions or a history of disordered eating. Additionally, maintaining a prolonged energy deficit can lead to a decline in metabolic rate, which can make weight loss more challenging over time. As such, it is essential to prioritize overall health and well-being when considering any dietary changes.
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Health benefits
An energy-restricted diet, also known as caloric restriction, is a dietary regimen that reduces energy intake from food and beverages without causing malnutrition. It is based on nutrition guidelines for overweight and obese individuals, aiming to achieve a calorie deficit of 600 kcal per day. This diet is suitable for weight loss and improving overall health, particularly in adults.
Energy restriction diets have been found to positively impact weight management, longevity, and aging-associated diseases. The reduction in caloric intake can lead to weight loss, lower waist circumference, and improved body mass index (BMI). This type of diet is especially beneficial for overweight or obese individuals, as it can improve health through weight loss. Additionally, it can help manage conditions like diabetes and prediabetes when combined with physical exercise.
Intermittent energy restriction (IER) or time-restricted eating (TRE) involves alternating between periods of calorie deficit and normal eating patterns. This approach has been shown to improve metabolic health, reduce fasting glucose and insulin levels, and positively impact the gut microbiome and brain activity. IER and TRE can lead to modest weight loss and improve metabolic markers, such as systolic blood pressure and HbA1c%.
Research on rhesus monkeys, who are genetically similar to humans, suggests that caloric restriction can delay the effects of aging. The study found that reduced food intake in adult and older primates was associated with improved survival rates and fewer age-related disorders. Additionally, calorie restriction has been found to preserve muscle tissue in non-human primates and rodents, possibly due to increased physical activity stimulated by calorie restriction.
While energy-restricted diets offer health benefits, they should be approached with caution. Some people may experience side effects such as cold sensitivity, menstrual irregularities, infertility, or hormonal changes. It is important to ensure that the diet is properly designed to include essential nutrients and is followed under the guidance of an experienced dietitian.
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Malnutrition risks
An energy-restricted diet, also known as caloric restriction, is a dietary regimen that reduces energy intake from food and beverages. The goal is to reduce calorie intake without causing malnutrition. This diet is often recommended for overweight or obese individuals to promote weight loss. It is also suggested for people with diabetes or prediabetes, combined with physical exercise.
However, malnutrition is a significant risk associated with energy-restricted diets, especially if the diet is not properly designed or supervised. Malnutrition refers to deficiencies, excesses, or imbalances in a person's intake of energy and nutrients. It includes undernutrition, which is a deficiency of nutrients, and overnutrition, which is an excess of nutrients. Undernutrition can lead to visible wasting of fat and muscle, but it can also be invisible. It is possible to be overweight and undernourished, as undernutrition refers to the lack of specific nutrients rather than a lack of food. Micronutrient deficiencies, such as vitamins and minerals, can have severe consequences, including blindness from vitamin A deficiency and soft bones from vitamin D deficiency.
To prevent malnutrition, it is crucial to ensure that an energy-restricted diet still provides a well-balanced variety of nutritious whole foods. This includes ensuring adequate intake of macronutrients (proteins, carbohydrates, and fats) and micronutrients (vitamins and minerals). Failure to obtain sufficient nutrients can lead to metabolic adaptations and negative health consequences. For example, the Minnesota Starvation Experiment, which involved a 40% reduction in energy intake for lean young men, resulted in negative effects such as chronic weakness, edema, muscle wasting, and psychological issues.
Certain populations are more vulnerable to malnutrition. Children, the elderly, and people with chronic conditions may require closer attention to their diet and health. Additionally, poverty amplifies the risk of malnutrition, as individuals in poorer communities often have limited access to adequate nutrition. Malnutrition can have serious and lasting developmental, economic, social, and medical impacts on individuals, families, and communities.
It is important to note that energy-restricted diets should be approached with caution and preferably under the guidance of a healthcare professional or experienced dietitian. They are not suitable for everyone, especially those with certain medical conditions or a history of disordered eating.
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Obesity treatment
Obesity is a disease defined by an elevated body mass index (BMI) resulting from the abnormal accumulation of body fat. The treatment for obesity often involves dietary intervention, which typically includes calorie restriction and consequent weight loss.
An energy-restricted diet is a dietary regimen that reduces energy intake from food and beverages without causing malnutrition. This type of diet is based on nutrition guidelines for overweight individuals and involves a calorie restriction of about 600 kcal per day. The recipes followed in this diet automatically have a lower caloric value, making it suitable for weight loss.
Intermittent energy restriction (IER) is a special type of energy-restricted diet that involves intermittent pauses in eating. IER includes variations such as alternate-day fasting (ADF) and time-restricted feeding (TRF). This diet has been shown to positively alter the gut microbiome and brain activity, decrease the activity of brain regions involved in the regulation of appetite and addiction, and improve metabolic parameters. In a study, participants on an IER diet for 62 days experienced an average weight loss of 7.6 kilograms, or about 7.8%.
However, it is important to note that energy-restricted diets may not be effective for long-term weight loss. While numerous publications show positive short-term results, the long-term results indicate that a small minority of individuals maintain a lower body weight, while the majority regain most of the initial weight loss. Additionally, powerful biological compensatory mechanisms can make it challenging to maintain lower body weight after a diet intervention.
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Frequently asked questions
An energy-restricted diet is a dietary regimen that reduces energy intake from food and beverages without causing malnutrition. It is based on nutrition guidelines for overweight and obesity.
An energy-restricted diet is suitable for people who want to lose weight, especially those who are overweight or obese. However, it is not suitable for those who are very muscular, pregnant, or breastfeeding.
An energy-restricted diet can help with weight loss and improve metabolic parameters. It can also positively alter the gut microbiome and brain activity, leading to improved attention, motor inhibition, emotion, learning, and willpower.
