Jeffrey Salazar
Calorie-restricted diets, also known as CR diets, are dietary regimens that reduce calorie intake without causing malnutrition. The aim is to achieve or maintain a low-normal body weight (BMI <21 kg/m2) while still consuming essential nutrients. CR diets have been found to improve health and longevity in animal models, reducing the risk of chronic diseases, improving metabolic functions, and delaying biological aging. However, human trials are challenging due to the length of time required to demonstrate definitive results. While some human studies have shown improvements in biomarkers of aging, cardiovascular risk factors, and cognitive function, extreme calorie restriction can lead to harmful side effects, including impaired immune function and severe health issues. Therefore, CR diets should be approached with caution and under the supervision of a healthcare practitioner.
| Characteristics | Values |
|---|---|
| Definition | Caloric restriction is defined as a method of extending life span by reducing total caloric intake without altering the intake of essential dietary components. |
| Benefits | Reduced blood glucose and insulin levels, improved glucose tolerance, increased insulin sensitivity, reduced oxidative damage, improved lipid profile, reduced inflammation, reduced blood pressure, reduced DNA fragmentation, improved memory, reduced risk of chronic diseases (e.g. cancer, diabetes, heart disease, obesity), delays biological aging, increased lifespan in animal studies |
| Drawbacks | Increased sensitivity to cold, loss of libido, extreme leanness, impaired menstrual cycles, impaired immune function, negative impact on certain population groups (e.g. lean people with low body fat), challenging to maintain long-term |
| Practical Considerations | Should be followed under the supervision of a healthcare practitioner to ensure nutrient requirements are met, may be combined with intermittent fasting or specific diets (e.g. Mediterranean diet) |
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What You'll Learn
Calorie restriction and increased longevity
Calorie restriction refers to dietary regimens that reduce calorie intake without causing malnutrition. Calorie restriction has been shown to extend the lifespan of several animal species, including rodents and rhesus macaques. In humans, studies have shown that calorie restriction can improve health and longevity by reducing the risk of chronic diseases such as cancer, diabetes, heart disease, obesity, and Type 2 diabetes, and delaying biological aging.
One small study compared 18 people following a calorie-restricted diet ( <1500 or <2000 calories daily for women and men, respectively) with 18 people eating a typical Western diet. The study reported significantly lower blood pressure, body mass index, and cholesterol in the calorie-restricted group, as well as total reductions in CVD risk. Another study, the CALERIE trial, found that a 25% calorie-restricted diet in young and middle-aged healthy adults resulted in a reduction in cardiometabolic risk factors, improved glucose tolerance, and insulin sensitivity.
The Calorie Restriction Society (CRS) is a group of individuals who voluntarily restrict their calorie intake by about 30% to prove that CR increases longevity. Data from members of the CRS showed that CR provided protective effects against obesity, diabetes, inflammation, and LV diastolic function.
While calorie restriction has been shown to have health benefits, it is not practical for most people and can be difficult to maintain long-term. Extreme calorie restriction, such as a 40% reduction in calories, can lead to impaired immune function and severe infections. It is important to note that calorie restriction should be done under the supervision of a healthcare practitioner to ensure that nutrient requirements are met and to avoid potential side effects such as increased sensitivity to cold, loss of libido, extreme leanness, and impaired menstrual cycles.
In summary, calorie restriction has been shown to increase longevity and improve health in animal models and humans. However, more research is needed to fully understand the long-term effects of calorie restriction and its applicability to different populations.
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Calorie restriction and chronic disease
Calorie restriction (CR) is a dietary intervention that reduces food intake without causing malnutrition. It is defined as a method of extending lifespan by reducing total caloric intake without altering the intake of essential dietary components. CR has been shown to extend both the median and maximal lifespan in a variety of species, including yeast, worms, fish, rats, and mice.
In humans, CR refers to energy intake that is sufficiently low to achieve or maintain a low-normal body weight (BMI <21 kg/m2) without causing malnutrition. Studies have shown that CR diets improve health and longevity in humans. For example, the CALERIE trial was a two-year multicenter randomized controlled trial that measured the short- and long-term effects of a 25% calorie-restricted diet in young and middle-aged healthy adults. After two years, the group achieved an 11.9% CR, which resulted in a reduction in all cardiometabolic risk factors, including cholesterol, blood pressure, and weight.
CR has been found to protect against obesity, insulin resistance, hypertension, inflammation, and atherosclerosis in humans. It also reduces the risk of chronic diseases, such as cancer, diabetes, heart disease, obesity, and Type 2 diabetes, and delays biological aging in humans. Studies show that individuals on a CR diet have greater insulin sensitivity, lower blood pressure, improved lipid profiles, reduced oxidative damage, and reduced markers of inflammation.
In rodents, CR has been shown to increase both average and maximal lifespan and decelerate many age-dependent physiological and structural changes in multiple organs and tissues. It also prevents or delays the occurrence of a wide range of chronic diseases. However, extreme caloric restriction—a 40% reduction in calories—is associated with impaired immune function, which can lead to more severe infections.
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Calorie restriction and weight loss
Calorie restriction involves reducing food intake without becoming malnourished. It is believed to prolong life expectancy and reduce the incidence of chronic diseases in humans. Calorie restriction is defined as a method of extending life span by reducing total caloric intake without altering the intake of essential dietary components.
Calorie restriction has been shown to have several benefits for humans. Firstly, it reduces the risk of chronic diseases, including cancer, diabetes, heart disease, obesity, and Type 2 diabetes. It also delays biological aging in humans, with studies showing that individuals on a calorie-restricted diet have greater insulin sensitivity, lower blood pressure, improved lipid profiles, and reduced markers of inflammation. Additionally, calorie restriction has been found to improve cognitive function, with increased verbal memory scores observed in a study of healthy older adults.
However, it is important to note that calorie restriction can be challenging to maintain long-term and may not be suitable for everyone. Extreme calorie restriction, such as a 40% reduction in calories, can lead to impaired immune function and an increased risk of severe infections. Additionally, side effects of calorie restriction may include increased sensitivity to cold, loss of libido, extreme leanness, and impaired menstrual cycles. Therefore, it is recommended that individuals consult with a healthcare practitioner before starting a calorie-restricted diet to ensure nutrient requirements are met and potential side effects are monitored.
While calorie restriction has been shown to lead to weight and fat loss, the precise amount of calorie intake and associated fat mass for optimal health in humans is not yet known. Further research is needed to determine the long-term effects of calorie restriction and its potential for disease prevention. Additionally, it is important to distinguish between moderate calorie restriction and extreme calorie restriction, as the latter can have negative consequences for health.
Overall, calorie restriction has been shown to have potential benefits for weight loss and improving various health markers. However, it should be approached with caution and under the guidance of a healthcare professional to ensure safety and effectiveness.
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Calorie restriction and nutrition
Calorie restriction is a dietary regimen that reduces calorie intake without causing malnutrition. It is believed to prolong life expectancy and reduce the incidence of chronic diseases in humans. Calorie restriction involves eating predominantly nutrient-dense foods to maintain nutritional adequacy.
Calorie restriction has been shown to improve health biomarkers such as glucose tolerance, insulin sensitivity, and metabolic syndrome scores. It also reduces the risk of chronic diseases, including cancer, diabetes, heart disease, obesity, and Type 2 diabetes. In addition, it delays biological aging in humans. Studies have shown that individuals on a calorie-restricted diet have greater insulin sensitivity, lower blood pressure, improved lipid profiles, and reduced markers of inflammation.
Calorie restriction has been found to slow aging and increase lifespan in animal models, including rodents and rhesus macaques. However, it is important to note that extreme calorie restriction, such as a 40% reduction in calories, can lead to impaired immune function and more severe infections. It can also cause negative side effects such as increased sensitivity to cold, loss of libido, extreme leanness, and impaired menstrual cycles.
Calorie restriction should be followed under the supervision of a healthcare practitioner to ensure that nutrient requirements are met and malnutrition is avoided. It is also important to note that calorie restriction may not be practical or feasible for most people due to its strict requirements and potential long-term adherence challenges.
While the precise amount of calorie intake for optimal health in humans is not yet known, ongoing research in this area continues to explore the potential benefits of calorie restriction on disease prevention, aging, and longevity.
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Calorie restriction and side effects
Calorie restriction involves reducing food intake without malnutrition. It is believed to prolong life expectancy and reduce the incidence of chronic diseases in humans. It also has cardiovascular benefits. However, it is not practical for most people and is difficult to maintain long-term.
Some studies have shown that calorie restriction improves health by reducing Pla2g7 activity, which regulates inflammation. Calorie restriction also inhibited the activity of the gene for Pla2g7. Mice without this gene gained less weight from eating a high-fat diet than control mice and were less likely to develop fatty liver disease. They also burned more fat than control mice. In addition, aged mice lacking Pla2g7 had less inflammation and larger, more productive thymuses.
Calorie restriction has been shown to reduce the risk of chronic diseases, such as cancer, diabetes, heart disease, obesity, and Type 2 diabetes, and delays biological aging in humans. It also results in greater insulin sensitivity, lower blood pressure, improved lipid profiles, reduced oxidative damage, and reduced markers of inflammation.
However, extreme caloric restriction—a 40% reduction in calories—is associated with impaired immune function, which can lead to more severe infections. Caloric restriction also resulted in a reduced ability to move, reduced grip strength, faster onset of clinical symptoms, and shortened lifespan in ALS rodents.
It is important to note that more research is needed on the long-term effects of caloric restriction and to elucidate the mechanisms for its efficacy in relation to CVD prevention. Additionally, it is crucial to consult with a healthcare professional before starting any diet, including calorie restriction, to ensure it is safe and appropriate for your individual needs.
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Frequently asked questions
A calorie-restricted diet is an eating plan that involves reducing your daily caloric intake to create a calorie deficit and promote weight loss. The number of calories restricted varies depending on individual needs and health goals.
Calorie restriction is based on the idea that eating fewer calories can lead to weight loss and potentially improve health and longevity. The specific number of calories consumed varies, typically ranging from 1200 to 1800 calories per day for most adults.
Calorie-restricted diets have been associated with reduced risk factors for age-related diseases such as diabetes, heart disease, and stroke. They may also lower fasting glucose levels, reducing the chances of developing type 2 diabetes. Additionally, calorie restriction may decrease the probability of certain types of cancer.
Yes, extreme calorie restriction can lead to malnutrition and adverse health effects. It is important to ensure adequate nutrition and consult with a healthcare professional or dietitian to develop a balanced and safe diet plan. Calorie-restricted diets may not be suitable for everyone, including pregnant or breastfeeding women and certain athletes.
It is recommended to consult with a healthcare professional or registered dietitian before starting a calorie-restricted diet. They can help determine your daily calorie needs, taking into account factors like age, sex, activity level, and body size. A dietitian can also assist in structuring meals and portion sizes to ensure a balanced and nutritious diet.
