Unhealthy Fast Food Harms Health and Slows Development in Slow-Growing Children

Products categorized as "ultra-processed fast food" are distinguished by an elevated degree of industrial processing, which inherently results in excessive concentrations of refined carbohydrates—including high-fructose corn syrup and sucrose—alongside saturated fats and sodium. A defining characteristic of these food items is their exceptionally high energy density coupled with a concomitant deficiency in micronutrients, dietary fiber, and essential vitamins. For instance, a typical "burger-and-fries combo" provides approximately 1000–1200 kilocalories, accounting for 40–50% of the daily energy requirement for an average adult. Systematic consumption of such meals has been empirically established as the primary etiologic factor in the global obesity epidemic, which in turn serves as a major risk multiplier for the development of metabolism-related non-communicable diseases.

A fundamental component of *fast food* is rapidly digestible carbohydrates, which undergo enzymatic hydrolysis to glucose during gastrointestinal transit. Following absorption in the small intestine, this monosaccharide enters systemic circulation, inducing a sharp postprandial glycemic spike. In response, the pancreas secretes insulin—a peptide hormone tasked with facilitating glucose uptake by peripheral tissues. Chronic hyperstimulation of this regulatory axis leads to impaired insulin signaling in target cells, a pathological state known as insulin resistance that underpins type 2 diabetes mellitus. Furthermore, excessive intake of simple sugars correlates with increased visceral adipose tissue deposition, which exacerbates low-grade systemic inflammation and accelerates the progression of metabolic syndrome.

Another hazardous constituent is *trans*-fatty acids, generated during the partial hydrogenation of vegetable oils—a process widely employed by the food industry to extend product shelf life. These *trans* isomers exhibit potent pro-atherogenic properties by adversely modifying the lipid profile: they elevate low-density lipoprotein (LDL) concentrations while concurrently reducing high-density lipoprotein (HDL) levels. LDL particles transport cholesterol esters to the vascular endothelium, where oxidative modification triggers foam cell formation and atherosclerotic plaque development. Conversely, diminished HDL levels impair reverse cholesterol transport, further amplifying coronary artery disease risk. Pooled analyses of prospective cohort studies demonstrate that each 2% increment in energy derived from *trans* fats increases coronary event incidence by 23% (relative risk 1.23, 95% confidence interval 1.07–1.41).

Equally concerning is the excessive sodium intake associated with *fast-food*-centered diets, where average consumption frequently exceeds 8–10 grams daily—nearly double the World Health Organization’s recommended maximum of 5 g/day. Chronic hypernatremia promotes fluid retention, elevates blood pressure, and imposes a sustained burden on the cardiovascular system. Longitudinal epidemiologic investigations (e.g., the *INTERSALT* study) have confirmed a linear dose-response relationship between salt intake and the prevalence of hypertension, stroke, and heart failure. Additionally, elevated urinary sodium excretion correlates with increased calcium loss, thereby accelerating bone demineralization and heightening osteoporosis risk in later life.

The consistent consumption of highly processed fast-food meals poses substantial threats to human health, correlating with a spectrum of severe medical conditions. Among the most prevalent and dangerous consequences are morbid obesity, the development of insulin resistance progressing to type 2 diabetes mellitus, cardiovascular diseases—including coronary artery disease and hypertension—as well as malignant neoplasms affecting various organs. Notably, epidemiological research has revealed a striking association between frequent fast-food intake and an approximately 50% elevated risk of experiencing depressive episodes compared to individuals who completely abstain from such products. Furthermore, this dietary pattern adversely affects dermatological health by promoting excessive sebum secretion, which exacerbates acne formation, particularly among adolescents undergoing puberty—a phenomenon attributed to the high glycemic index of simple carbohydrates present in these foods. Additionally, these sugars facilitate the proliferation of cariogenic bacteria within the oral cavity by lowering salivary pH and inducing dental enamel demineralization. It is crucial to emphasize that the appealing taste and aroma of fast food are frequently achieved through the incorporation of artificial flavor enhancers, preservatives, and nature-identical flavorings, which may induce food addiction. Nutrition specialists also caution about the potential inclusion of addictive substances intentionally added by manufacturers to enhance consumer loyalty. While abstaining from fast food may seem challenging due to its ubiquitous availability and convenience, making informed dietary choices is paramount for long-term well-being. It is also worth noting that such food is often classified as "toxic" owing to its detrimental effects on metabolic processes, immune function, and gut microbiota composition. We also invite you to explore materials addressing the causes of weight gain after the age of 40, effective strategies for managing excess body weight, and practical advice on preparing healthier versions of popular dishes like pizza without compromising taste.