Functional Foods in Times of Pandemic: Mini review Mini Estrada-Fernández Ana Guadalupe and Mendoza-Mendoza Bethsua*

In 2020, the world was surprised by the attack of the SARS-CoV-2 virus, which causes the acute respiratory syndrome COVID-19, this led to the establishment of social isolation as the main measure to stop contagion, causing an increase in physical inactivity , poor diet and sleep quality, raising health problems that already existed before the pandemic, such as overweight, obesity, diabetes, cardiovascular diseases and even depression of the immune system [1]. The use of functional foods is considered a good option in times of pandemic. A food can be considered functional if it is shown to have a function, beyond nutritional effects, to improve health status and/ or reduce the risk of disease [2]. While natural foods, such as strawberries or onions, have been defined as functional foods, only foods that undergo processing are considered functional foods. Thus, several methods to obtain functional foods include the addition or removal of a component, which allows the food industry to develop new value-added products in the market [3]. Therefore, the objective of this review is to show the use of some foods that have been exploited as a source of bioactive compounds in order to be used in the creation of functional foods. Aguamiel


Introduction
In 2020, the world was surprised by the attack of the SARS-CoV-2 virus, which causes the acute respiratory syndrome COVID-19, this led to the establishment of social isolation as the main measure to stop contagion, causing an increase in physical inactivity , poor diet and sleep quality, raising health problems that already existed before the pandemic, such as overweight, obesity, diabetes, cardiovascular diseases and even depression of the immune system [1].
The use of functional foods is considered a good option in times of pandemic. A food can be considered functional if it is shown to have a function, beyond nutritional effects, to improve health status and/ or reduce the risk of disease [2]. While natural foods, such as strawberries or onions, have been defined as functional foods, only foods that undergo processing are considered functional foods. Thus, several methods to obtain functional foods include the addition or removal of a component, which allows the food industry to develop new value-added products in the market [3]. Therefore, the objective of this review is to show the use of some foods that have been exploited as a source of bioactive compounds in order to be used in the creation of functional foods.

Aguamiel
The "aguamiel" is the sap of agave, obtained from plants between 8 and 10 years old. The Agaves used for its production are Agave americana, Agave atrovirens, Agave ferox, Agave mapisaga and Agave salmiana. Each plant produces approximately 1,500L of sap in a period of 4-6 months [4]. This can be consumed directly or as honey, which can be combined with other foods [5]. Its main components are water, sugars, proteins, gums, and mineral salts [4]. It is characterized by its high content of fructose and fructooligosaccharides, responsible for the prebiotic effect of this food [6].
On the other hand, the high content of saponins and phenolic compounds, contributes to attenuate glucose intolerance, weight reduction and fat mass, as well as lowering blood glucose, insulin and cholesterol levels [7]. It is also important to note that mead contains high levels of potassium, iron, B-complex vitamins, essential amino acids, and zinc [8].
requirements of iron and zinc, respectively. Its antioxidant capacity exceeds that of strawberry, raspberry, red plum, grapefruit and orange [10]. Xoconostle has been reported to be rich in polyunsaturated (PUFAS) and saturated (SFA) fatty acids, ideal for providing cardiovascular benefits to the consumer; representative SFAs include ac. palmitic and myristic; monounsaturated fatty acids are ac.
oleic and linoleic as the majority among PUFAS [11]. The usefulness of xoconostle has been described in the alternative treatment of type II diabetes mellitus (MD), reduction of triglycerides and cholesterol, since the hypoglycemic effect, its effect on the decrease of serum lipid levels and increase of insulin in blood [12].

Conclusion
The discernment of bioactive compounds and the desirable effects on consumer health are undoubtedly an indispensable instrument to reduce the incidence of chronic non-communicable diseases that in recent years have caused great economic costs and deaths throughout the world. Aguamiel, xoconostle and garlic are excellent options for obtaining bioactive compounds that can be included in the preparation of functional foods and even naturally integrated into the consumer's daily diet, as an alternative for healthy consumption.