Awareness and Knowledge about Vitamin D among College Students: A Review

1.1 The Multifaceted Role of Vitamin Din Human Health: Vitamin D, sometimes referred to as the "sunshine vitamin," is a fat-soluble nutrient distinguished by its dual role as botha dietary element and a hormone produced by the body. The principal source is endogenous synthesis in the skin, where ultraviolet B (UVB) radiation from sunshine transforms 7-dehydrocholesterol into cholecalciferol (Vitamin D3). The molecule undergoes hydroxylation in the liver to make 25-hydroxyvitamin D (25(OH)D), the circulating form utilized to evaluate Vitamin D status, and is subsequently activated in the kidneys to produce 1,25-dihydroxyvitamin D (calcitriol), the physiologically active form. This complex metabolic route highlights Vitamin D'sfunction as a prohormone, engaging with Vitamin D receptors present in almost all tissues, including bones and brain cells. Historically acknowledged for its function in calcium regulation and skeletal health, preventing rickets in children and Osteomalacia or osteoporosis in adults, the importance of Vitamin D has significantly increased in recent decades. As Fig.1 shows the important role and deficiency factors of Vitamin D. Also, research has demonstrated its role in immunological regulation, decreasing the likelihood of diseases such as tuberculosis and influenza by augmenting innate immunity via cathelicidin synthesis. In addition to its role in immunity, Vitamin D affects cell proliferation and differentiation, providing preventive benefits against malignancies, including colorectal and breast cancer. Cardiovascular health is enhanced, since research associates sufficient Vitamin D levels with reduced risks of hypertension and atherosclerosis, facilitated by its anti-inflammatory effects and modulation of the renin-angiotensin system. Mental health constitutes another domain where the influence of Vitamin Dis becoming increasingly apparent. Reduced levels have been linked to depression, anxiety, and seasonal affective disorder, disorders common among college students experiencing scholastic stress. Anglin et al. [2] conducted a meta-analysis that revealed a statistically significant association between Vitamin D insufficiency and depressive symptoms, indicating a potential neurobiological function perhaps related to vitamin D receptors in the hippocampus and prefrontal cortex. These findings are especially relevant for young adults, whose cerebral development persists into their early twenties, rendering Vitamin Dan essential nutrient during this period. In India, despite enough sunlight, Vitamin D insufficiency impacts 70-100% of the population, a contradiction influenced by urbanization, pollution, and cultural habits. College students in urban centre’ssuch as Lucknow exemplify this concern, as their scholastic obligations and indoor lifestyles restrict sun exposure, while food sources are limited in conventional vegetarian diets. This section examines these dynamics comprehensively, establishing a foundation for comprehending awareness levels among college students in Lucknow.

FIGURE 1: Vitamin D’s Role and Deficiency Factor 1.2 Global and Indian Context of Vitamin D Deficiency: Worldwide, Vitamin D insufficiency constitutes a silent epidemic, impacting nearly one billion individuals, according to Holick [9]. In affluent countries, the fortification of foods such as milk and cereals has alleviated severe deficiencies; yet, inadequate amounts remain due to diminished sun exposure resulting from sedentary lifestyles and the application of sunscreen. Conversely, developing nations such as India encounter a distinct challenge: plentiful sunshine is compromised by environmental and behavioural influences. Research demonstrates that 25(OH)D levels below 20 ng/ml, classified as inadequate, are prevalent throughout all age demographics in India, with urban populations being especially susceptible. The Indian context is characterized by a convergence of variables. Urbanization has concentrated populations inside, diminishing UVB exposure vital for Vitamin D production. Air pollution, a critical concern in urban areas such as Lucknow, disperses and absorbs UVB rays, hence reducing cutaneous synthesis. Cultural conventions intensify this phenomenon: the inclination towards pale skin promotes sunscreen application and sun evasion, while conventional attire, particularly for women, conceals the majority of the body. Harinarayan et al. [8] discovered that, despite the abundant sunlight in southern India, insufficiency rates surpass 80% owing to these obstacles. Dietary consumption provides minimal relief. Natural sources of Vitamin D, such as fatty fish, egg yolks, and liver, are scarce in predominantly vegetarian Indian diets, particularly in regions like Uttar Pradesh. Fortified foods, although accessible in metropolitan markets, are rarely extensively consumed, especially by budget-conscious students dependent on hostel meals or street food. Ritu and Gupta [18] emphasize that fortified milk is underutilized due to cost and awareness deficiencies, resulting in supplementation being infrequently pursued. The dietary deficiency, along with environmental limitations, categorizes college students as a high-risk demographic, warranting a more thorough investigation of their knowledge. 1.3 Challenges Specific to College Students in Lucknow: Lucknow, the capital of Uttar Pradesh, amalgamates heritage and modernity, including esteemed institutions such as Babasaheb Bhimrao Ambedkar University, Lucknow. College students, numbering in the tens of thousands, encounter distinct problems that exacerbate the hazards of Vitamin D insufficiency. Academic timetables are demanding, involving extensive hours in classrooms, libraries, or dormitories, which limit sun exposure. A proposed day schedule may encompass morning lectures, afternoon study periods, and evening tasks, resulting in minimal opportunity for outdoor pursuits. Even physical education sessions, when available, are frequently conducted indoors or during early morning hours when UVB rays are inadequate. Environmental factors exacerbate this condition. Lucknow is classified as one of India'smost polluted cities, with particulate matter (PM2.5) concentrations often beyond permissible thresholds. This pollution disperses UVB photons, diminishing their availability for Vitamin D production. Research conducted by Harinarayan et al. [8] in Hyderabad, a similarly polluted urban centre, revealed that air aerosols reduced UVB penetration by as much as 50%, a phenomenon presumably reflected in Lucknow. Seasonal fluctuations, including the city'sfog-laden winters, significantly restrict sunshine, especially from November to February, coinciding with students' peak academic engagement. The conservative mindset of Lucknow culturally impacts student behaviour. Female students, comprising a substantial segment of the college demographic, frequently don full-length garments such as salwar kameez or sarees, thereby minimizing skin exposure. The cultural preference for pale skin deters tanning, especially among male students who may otherwise participate in outdoor sports. Dietary practices mirror regional conventions: vegetarianism is predominant, with hostel menus primarily featuring grains, lentils, and vegetables, lacking Vitamin D-rich items. Fast food, a mainstay for students, provides calories without any nutritious compensation for this deficiency. Socioeconomic diversity introduces an additional dimension. Students from wealthy homes may utilize supplements or fortified items, whilst those from lower-income backgrounds depend exclusively on sunlight and limited nutritional sources. This discrepancy undoubtedly affects awareness, as affluent students may get health information via private healthcare or media, in contrast to their counterparts reliant on public resources. These problems underscore the necessity to evaluate and improve Vitamin D awareness among college students in Lucknow. 1.4 The Importance of Awareness in Preventive Health: Awareness is the cornerstone of preventative health, connecting information and action. The Health Belief Model (HBM) asserts that behavioural modification depends on perceived susceptibility, severity, advantages, and obstacles. Students must identify their risk factors for Vitamin D deficiency (e.g., sedentary indoor lifestyles), comprehend the potential repercussions (e.g., osteoporosis, depression), acknowledge the advantages of proactive measures (e.g., enhanced immunity), and surmount obstacles (e.g., time limitations). However, awareness is inadequate without precise, actionable knowledge. Research indicates that college pupils, notwithstanding their degree, possess misunderstandings regarding Vitamin D. Srinivasan et al. [22] discovered that several individuals overestimate the necessary sun exposure, supposing that several hours are essential, whereas 15-30 minutes of midday exposure on the face and arms is adequate for lighter skin tones (darker complexion, common in India, necessitates more). Many individuals are oblivious to food sources or supplements, mistakenly believing that sunlight alone suffices for their requirements—an erroneous assumption in polluted, metropolitan environments. These deficiencies highlight the necessity for focused education that dispels misconceptions and offers pragmatic solutions. In Lucknow, awareness is further hindered by restricted health literacy beyond medical fields. Non-medical students, including engineers, artists, or commerce majors, may lack exposure to nutritional science and depend on informal sources such as peers or social media, potentially perpetuating misconceptions. Manandhar et al. [14] discovered that even medical students possess only moderate knowledge, indicating that awareness efforts should be comprehensive yet customized. This review seeks to analyse these dynamics, providing a basis for actions that align with Lucknow'svaried student population. 1.5 Objectives of the Review: This study aims to achieve four principal objectives: • Evaluate Awareness Levels: Determine the existing knowledge of Vitamin D among college students in Lucknow, integrating global and Indian data to infer local trends. • Ascertain Determinants: Identify determinants affecting awareness, including education, gender, and socioeconomic status, to inform targeted interventions. • Examine Demographic Disparities: Investigate variations in awareness among subgroups, pinpointing inequalities that require intervention. And Suggest Interventions: Identify research deficiencies and propose practical measures to improve awareness, specifically suited to the context of Lucknow. This comprehensive analysis aims to highlight a significant public health concern, promoting educated and proactive health behaviours among college students. To enhance health • maintenance and address vitamin D deficiency, one should incorporate comprehensive dietary sources of vitamin D, including natural food sources, fortified foods, and supplements administered inappropriate dosages and formulations as recommended by a healthcare professional tailored to the individual patient. Some sources are illustrated in Table 1. Also factors which influences the vitamin D levels shown in fig.2 TABLE 1 SOURCES OF VITAMIN D, THEIR TYPES, AND ESTIMATED INTAKE LEVELS Vitamin D Approximate Dose (IU Source Type Examples Type of Vitamin D Content per serving)

Fatty fish (salmon, Vitamin D3 400–600 IUper 3.5 ozmackerel, tuna, High (Cholecalciferol) (100g) sardines)

Vitamin D3 Egg yolks Moderate 40–50 IUper yolk Natural Food (Cholecalciferol)

Sources Mushrooms Vitamin D2 200–500 IUper 3.5 oz (especially sun-Moderate (Ergocalciferol) (100g) exposed)

Vitamin D3 1,360 IUper 1 Cod liver oil Very High (Cholecalciferol) tablespoon Fortified dairy Varies (depends on Vitamin D3 100–150 IUper cup products (milk, fortification level) (Cholecalciferol) (milk) yogurt, cheese)

Fortified plant-based Fortified Foods Vitamin D2 or D3 (Varies milk (soy, almond, Varies 100–150 IUper cup by brand) oat)

Fortified cereals and Vitamin D2 or D3 (Varies Moderate 40–100 IUper serving orange juice by brand)

Vitamin D2 or D3 Vitamin D2 and D3 400–5,000 IUper dose Supplements Controlled dose (Depends on the supplements (varies) supplement) 10,000–25,000 IU (15– Sunlight UVB rays from Essential for skin Helps skin synthesize 30 min midday sun Exposure sunlight synthesis Vitamin D3 exposure)

Note: The figures of International Units (IU) are estimations and may fluctuate according on the brand, fortification levels, and portion size.

FIGURE 2: Factors Influencing Vitamin D Levels