RESUMO
Vitamin A, also known as retinol, is a non-water-soluble vitamin. Vitamin A is very important for the proper functioning of the human body. Retinol, especially in the form of retinyl ester, can be found in many animal-based products and is essential for the efficient operation of many physiological processes. Fruits and vegetables are also excellent sources of vitamin A; the majority of them include carotenoids, which are precursors to vitamin A. The human body has the ability to convert natural retinols like retinyl ester, retinoic acid, and provitamin A into biologically active forms that interact with a variety of molecular targets like nuclear receptors and retinal opsins. This review article provides knowledge regarding retinol deficiency in humans. It provides brief information about the sources, etiology, epidemiology, pathophysiology, and treatment of vitamin A deficiency.
RESUMO
Outbreaks of infectious diseases confined to a particular locality are not unusual. Respiratory infections such as tuberculosis or community-acquired pneumonia are known in developing and underdeveloped countries. However, COVID-19 infection had globally created havoc due to its high rate of transmission and serious consequences on physical and mental health paralyzing the healthcare facilities of not only developing but also developed nations. This created a sense of uncertainty and insecurity in the public globally, adversely affecting the mental health of almost every individual. It is genuinely obtrusive that the COVID-19 pandemic brought about a global lockdown, adversely affecting the psychological health of the public. Some pandemic-related stressors affect nearly everyone. This review aims to study the effect of the COVID-19 pandemic in terms of psychological well-being and its overall effect on society, thereby making it essential to lend them a helping hand.