This volume, Women in Science T-XIV-2021 contains 7 refereed chapters dealing with these issues, chosen from among the contributions, we gathered some researchers and graduate students from the 32 states of our country. We thank the reviewers for their feedback that contributed greatly in improving the book chapters for publication in these proceedings by reviewing the manuscripts that were submitted. As first chapter, Martínez, Bravo, Sánchez and Montoya present Effect of the consumption of Stevia rebaudiana Bertoni as a natural and artificial sweetener on fatigue and oxidative stress of skeletal muscle, as second chapter, Hernández, Ramírez, Chávez and Oliart, will talk about Cashew bagasse (Anacardium occidentale L. ) as a source of fiber-antioxidant and its possible use in lipoinflammation models as the third chapter, Marcos, Ramirez, Oliart, and Guadarrama present The relevance of the source of animal or vegetable proteins on the metabolic syndrome and its comorbidities, as the fourth chapter, Damián, Rivera, Lizárraga and Vázquez. propose Wanderings of a magic element: the biogeochemical cycle of manganese, as the fifth chapter, Sánchez, Paniagua, Temiche and Alexander, perform Methods of physical control of pathogenic microorganisms in hospital areas, as the sixth chapter, Paniagua, Sánchez, Corro and Alexander develop Use of power ultrasound, supercritical fluids and membrane technology to obtain and/or preserve biological products for clinical use, and as the last chapter, Estrada, Figueroa, Sierra and Aguilar, focus on Obtaining and characterization of the ethanolic extract of the leaves of the Tradescantia Spathacea SW.