Nowadays, abstaining from food has become a universal remedy for all health conditions.. According to most people, it is the perfect diet for quick weight loss.. But is it really a sensible decision for the body to undertake such a strict diet? Have we ever asked ourselves what the consequences of such a miracle diet might be?
Extreme dietary restriction: therapeutic fasting or weight-loss starvation
Therapeutic fasting, often referred to as a starvation diet, represents a deliberate and controlled restriction of food intake characterized by a drastic reduction in daily caloric consumption, with the exclusive consumption of liquids—primarily water, sometimes supplemented with vegetable or fruit juices—for a strictly defined duration. The motivations behind undertaking such a regimen are diverse: some individuals are driven by the desire for rapid weight reduction, others aim to detoxify the body by eliminating accumulated contaminants, while others view it as a nutritional education tool to cultivate healthier eating habits or seek alternative therapeutic approaches for certain chronic conditions. Regardless of the underlying reason, it is crucial to emphasize that this practice is highly demanding—both physically and mentally—requiring not only strong willpower and discipline but also an awareness of the potentially severe repercussions for overall bodily function, including metabolic disturbances, compromised immune response, and nutritional deficiencies.
Therapeutic fasting as a health-restorative intervention with historical and clinical foundations
This practice—referred to as therapeutic fasting or medically supervised fasting—has been documented since antiquity, where Egyptian, Greek, and Roman physicians employed it as a purifying and restorative measure. Contemporary evidence-based medicine approaches this intervention with greater nuance, acknowledging its potential benefits solely for select metabolism-related and diet-dependent conditions, particularly those linked to excessive consumption of energy-dense, nutrient-poor foods. Clinical trials indicate that in individuals with obesity (BMI ≥ 30)[1], a structured fasting regimen may yield reductions in body weight, decreased low-density lipoprotein (LDL) cholesterol levels, and improved glycemic control. However, it is critical to emphasize that this method is categorically contraindicated during pregnancy, lactation, in pediatric populations undergoing developmental growth, and in patients with advanced cachexia (e.g., secondary to oncological disorders or prolonged hospitalized malnutrition). A prerequisite for the safe implementation of therapeutic fasting is close collaboration with a multidisciplinary team comprising internal medicine specialists and clinical dietitians, who provide continuous patient monitoring and tailor the protocol to individual needs. The preparatory phase should span approximately 7–14 days, during which animal-derived products (meat, dairy), refined grains, and ultra-processed foods are systematically eliminated and replaced with raw, unprocessed vegetables and fruits characterized by a low glycemic index, consumed without thermal treatment.
Detoxification fasting: An examination of purification mechanisms and physiological implications
Presently, this is arguably one of the most widely recognized and frequently practiced fasting regimens, primarily intended to facilitate bodily detoxification and enhance overall physical and mental well-being. Nevertheless, the prevalent belief that such a cleansing fast effectively diminishes the body’s toxic burden lacks comprehensive validation in scientific literature. Numerous hazardous chemical compounds—including persistent organic pollutants (e.g., dioxins) and mercury derivatives (such as methylmercury)—exhibit lipophilic properties, meaning they predominantly accumulate within adipose tissue. During prolonged caloric restriction, the body is compelled to mobilize its energy reserves, triggering lipolysis—the breakdown of fats. Consequently, this process releases not only fatty acids but also the toxins stored in tissues, which then enter the bloodstream, potentially exacerbating the detoxification burden on the liver and kidneys [2–4].
Therapeutic fasting and its metabolic consequences from a historical and contemporary dietary research perspective
The deliberate restriction of food intake has been a longstanding practice deeply embedded in religious and spiritual traditions across centuries. A notable example is the month-long fasting period during Ramadan in Islamic culture, wherein adherents abstain from food and drink from dawn until sunset for thirty consecutive days. Similarly, complete fasting is employed as a component of meditative practices in Buddhism, aimed at attaining deeper states of consciousness. From a physiological standpoint, short-term caloric restriction—typically limited to one or two days—may yield certain benefits for the body, primarily through the induction of autophagy, a cellular process that recycles damaged proteins and organelles. However, this mechanism operates effectively only when the energy deficit is neither too severe nor prolonged.
When the fasting period extends beyond a safe temporal threshold, the body’s glycogen reserves stored in the liver and skeletal muscles become progressively depleted. Deprived of readily available energy sources, the organism is compelled to activate alternative metabolic pathways, including lipolysis—the breakdown of triglycerides stored in adipose tissue—and gluconeogenesis, the synthesis of glucose from amino acids derived from the degradation of structural proteins. These processes lead to the accumulation of ketone bodies in the bloodstream, thereby inducing a state of metabolic acidosis that strains the body’s buffering systems. A commonly observed consequence is weight loss, though this reduction is not solely attributable to fat metabolism but also results from the loss of intracellular water and—more alarmingly—the catabolism of muscle proteins, which undermines physical strength and endurance. Furthermore, prolonged malnutrition compromises immune system functionality, rendering the body more susceptible to infections and opportunistic diseases.
In extreme cases where fasting persists for weeks or months, severe protein-energy malnutrition develops, manifesting as systemic emaciation. Organs with high metabolic demands, such as the kidneys—which must intensify filtration to manage the byproducts of protein catabolism during fasting—and the liver, responsible for detoxification and glucose homeostasis, are particularly vulnerable. The progressive loss of appetite, driven by adaptive changes in the central nervous system, further exacerbates the cycle of malnutrition, ultimately leading to death from multi-organ failure. Clinical research confirms that unsupervised adherence to hunger diets carries substantial health risks and may even prove fatal.
The effect of starvation
Following a diet based on the principle of abstaining from meals and eating only water, or reducing oxidative stress.[8] These negative effects are also significant. However, even after a few hours without consciousness, the intensity of the body's work begins to decrease, and the body begins to become fatigued. Although the body can lose weight after eating too much fat, it can also lose weight and fat, and it is also necessary for our bodies to eat too much. It is important to make the following decisions, for example, to reduce the amount of food and energy in the body, which can lead to a number of metabolic and metabolic effects, such as reduction of body weight and weight loss.
