Madeleine Hull
Calorie-restricted diets are being studied as a possible way to maintain good health and live longer. They are not temporary weight-loss plans. Research on animals has shown that a restricted-calorie diet may extend lifespan and slow the onset of age-related disorders. However, the precise amount of calorie intake and associated fat mass for optimal health in humans is not known. Extreme calorie restriction can have adverse health effects and it may be difficult to consume all necessary nutrients on a very low-calorie diet. Calorie-restricted diets are sometimes prescribed to treat obesity, which has been linked to a poorer prognosis for several cancers.
| Characteristics | Values |
|---|---|
| Purpose | To lose weight, improve health, or live longer |
| Caloric Intake | 1200-1800 calories per day |
| Effectiveness | Weight loss varies between people |
| Safety | May lead to malnutrition or adverse health effects |
| Health Benefits | Reduced risk of cancer, cardiovascular disease, diabetes, etc. |
| Drawbacks | Difficult to obtain essential nutrients, emotional distress, confusion, etc. |
| Individual Variation | Depends on age, sex, activity level, body size, and personal preferences |
| Professional Guidance | Recommended to consult doctors or dietitians for a personalized plan |
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What You'll Learn
To lose weight
Calorie-restricted diets are often prescribed to achieve weight loss. Calorie restriction is a consistent pattern of reducing average daily caloric intake below what is typical or habitual, without malnutrition or deprivation of essential nutrients. This means that any amount of calories less than what the body needs daily to maintain its current weight will result in weight loss. For example, if a person normally consumes 2,500 calories daily, eating fewer calories will lead to weight loss.
There are various methods to achieve a calorie deficit. One method is to reduce the number of calories consumed daily. For instance, if a person wants to lose about 1 pound per week, they could eat about 500 fewer calories every day, creating a 500-calorie deficit. Another method is to increase physical activity and burn more calories. For example, a person could burn 500 more calories daily through exercise while maintaining their current diet. A combination of both methods can also be used.
It is important to note that severely restricting calories can lead to rapid weight loss, which may not be safe for some individuals. Rapid weight loss may cause muscle loss, water loss, and bone density loss. Additionally, people who lose weight very quickly are more likely to regain the weight over time. Therefore, gradual weight loss through moderate calorie restriction is generally recommended.
Calorie-restricted diets for weight loss have been studied in various research settings. One study, CALERIE, involved participants following a calorie-restriction diet for 2 years, resulting in an average weight loss of 10% that was largely sustained 2 years after the intervention. Another study on rhesus monkeys found that caloric restriction in the presence of adequate nutrition delayed the effects of aging and improved survival rates.
In summary, calorie-restricted diets are prescribed for weight loss by reducing daily caloric intake below an individual's maintenance level. Gradual and moderate calorie restriction is generally safer and more sustainable than rapid and severe calorie restriction.
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To prevent age-related diseases
Calorie restriction (CR) is the reduction of dietary intake below energy requirements while maintaining optimal nutrition. It is the only known nutritional intervention with the potential to attenuate ageing. Evidence suggests that it can increase life expectancy by 1-5 years, improving health and quality of life.
CR moderates intrinsic processes of ageing through cellular and metabolic adaptations and reducing the risk for the development of many cardiometabolic diseases. Studies have shown that CR can decrease systemic oxidative stress, which has been linked to age-related neurological conditions such as Alzheimer's, Parkinson's, and other diseases. CR can also reduce the risk of cancer, as malignant cells cannot obtain energy from ketones, which are produced when the body is in a state of CR.
CR can also reduce the risk of inflammatory diseases such as arthritis and type 2 diabetes, as it reduces insulin levels in the blood. It can also lower blood pressure and cholesterol, reducing the risk of age-related diseases such as heart disease and stroke.
CR may also protect against an ageing-related decline in the central nervous system, which could cause dementia and other disorders. However, it is important to note that CR carries potential risks that must be considered. Consuming fewer calories increases the risk of inadequate nutrient intake, and CR may also affect muscle and bone tissue, leading to unfavourable changes in physical functionality.
CR is not a starvation diet, and it is not for everyone. It is important to consult with a healthcare professional before starting any new diet plan.
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To reduce the risk of cancer
Calorie restriction (CR) is a dietary regimen in which individuals reduce their energy intake by 20% to 40% compared to an unrestricted diet. While CR is primarily associated with weight loss, it has also been explored as a potential strategy for cancer prevention and treatment.
Several studies have suggested that CR can effectively reduce the risk of cancer. For example, a study on early-onset anorexia nervosa patients found that those who experienced periods of calorie restriction had a lower chance of developing breast cancer. Additionally, surveillance data from communities subjected to calorie restriction during World War II indicated a reduced risk of breast cancer later in life for Norwegian women who experienced acute energy restriction.
The potential anticancer effects of CR have been observed in preclinical studies and animal models. In rodent models, CR has been shown to reduce circulating levels of growth factors, anabolic hormones, inflammatory cytokines, and oxidative stress markers associated with various malignancies. Furthermore, studies in rhesus monkeys have demonstrated that CR can delay disease onset and reduce mortality from cancer.
While the evidence suggests that CR may have potential benefits in cancer prevention, it is important to note that most of the data comes from animal studies and observational data in humans. The number of controlled clinical studies expressly investigating the effects of CR on cancer prevention in humans is limited, and more research is needed to confirm the efficacy and safety of CR as a cancer prevention strategy.
In summary, calorie restriction has been proposed as a potential strategy for reducing the risk of cancer. While preclinical studies and observational data suggest potential benefits, more controlled clinical trials are necessary to establish the effectiveness and safety of CR as a cancer prevention approach in humans.
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To improve cardiovascular health
Calorie-restricted diets are often prescribed to improve cardiovascular health. Calorie restriction is associated with a reduced risk of cardiovascular disease and improved long-term cardiovascular health.
Decreasing caloric intake by 20-30% while fulfilling nutrient requirements has been found to remedy diseases of ageing, including cardiovascular disease. This approach can lead to an average weight loss of 7.9 kilograms, which may also positively impact cardiovascular health.
Intermittent fasting, a form of calorie restriction, has been linked to improved cardiovascular health and longevity. For example, the 5:2 eating pattern involves five days of unrestricted eating followed by two days of restricted caloric intake. This method can contribute to maintaining a healthy weight and improving cardiovascular health.
Time-restricted feeding is another form of calorie restriction where meals are consumed within a limited number of hours each day, such as an 8-hour window. This method can help regulate blood sugar and improve cardiovascular health.
It is important to note that individual results may vary, and some people may need to remain on a restricted-calorie diet for a more extended period before experiencing improvements in cardiovascular health. Additionally, very low-calorie diets should be approached with caution, as they can lead to nutritional deficiencies and adverse health effects. It is always recommended to consult with a healthcare professional before starting any calorie-restricted diet to ensure it is safe and appropriate for your specific needs and health profile.
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To lower fasting glucose levels
Calorie-restricted diets are often prescribed to lower fasting glucose levels, especially in individuals with prediabetes or type 2 diabetes. Prediabetes is a highly prevalent condition characterised by elevated glucose levels that are higher than normal but below the diabetes diagnostic threshold. It often precedes the development of type 2 diabetes.
Low-calorie diets, ranging from 800 to 1500 kcal/day, have gained attention as a strategy to manage type 2 diabetes and lower fasting glucose levels. Studies have shown that these diets can lead to substantial improvements in cardiometabolic risk factors and significant weight loss, which is accompanied by a reduction in hepatic fat and improved hepatic insulin sensitivity. As a result, fasting plasma glucose levels can decrease significantly.
Time-restricted eating (TRE) is another dietary intervention that may be used in conjunction with calorie restriction to lower fasting glucose levels. TRE involves consuming meals within a limited time window each day, typically 8 to 12 hours, and can be customised according to an individual's needs. This method of intermittent fasting can improve glucose regulation by extending the duration of fasting ketosis, where fuel utilisation shifts from glucose to fatty acids and ketones.
While calorie restriction and TRE can be effective tools for lowering fasting glucose levels, it is important to note that they may not be suitable for everyone. Some individuals may experience adverse effects such as fatigue, constipation, or headaches. Additionally, long-term adherence to these dietary patterns can be challenging, and they may not be effective for weight loss or glucose control in the long term.
Overall, calorie-restricted diets and TRE can be valuable tools in managing fasting glucose levels, especially for individuals with prediabetes or type 2 diabetes. However, they should be implemented under the guidance of healthcare professionals to ensure safety, monitor for potential side effects, and tailor the intervention to individual needs.
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Frequently asked questions
A calorie-restricted diet involves reducing one's daily caloric intake below what is typical, without malnutrition or deprivation of essential nutrients.
Calorie-restricted diets are typically prescribed to achieve weight loss. They may also be recommended to reduce the risk of certain diseases, such as diabetes, and to improve health.
Research on animals has shown that calorie-restricted diets may extend lifespan and reduce the risk of age-related disorders. In humans, these diets have been associated with weight loss and improved health markers, such as lower fasting glucose levels.
Yes, extreme calorie restriction can lead to malnutrition and adverse health effects. It may also be challenging to obtain all the necessary nutrients. It is important to consult with a healthcare professional to ensure the diet is safe and balanced. Individual factors such as age, sex, activity level, and body size also play a role in determining the appropriate calorie intake.
