For high-temperature cooking, always use oils designed for this purpose, i.e., those with a predominance of saturated or monounsaturated fats (such as olive or canola oil), always filtered, because unfiltered oils contain particles that burn at relatively low temperatures. When addressing sources of omega-3 fats, the most advantageous plant-based options are hemp, chia, and flaxseed oils. However, be aware that these contain the omega-3 alpha-linolenic acid, which our metabolism is required to convert into docosahexaenoic acid (DHA); this conversion rate is relatively low (approximately 3-5%, though it can be considerably higher in vegans). Therefore, it is beneficial to include animal sources as well, which ensures greater efficiency in this respect, thereby preventing unnecessary concerns about a potential deficiency of omega-3s from plant sources.
The reason for the preventive avoidance of consuming flaxseeds is the relatively high content of phytoestrogens, which may not be desirable for certain thyroid dysfunctions. However, flaxseed oil contains a fractional amount of these substances, and its use in moderate amounts is perfectly acceptable.
Questions answered by
Mgr. Martin Jelinek
Lecturer and author of the educational system
Nutrition educator, lecturer, and author of the educational system and the ZOF learning application.
Mgr. Martin Jelínek has been systematically involved in nutrition education since 1999. He is the founder of ATAC, the educational company behind NutriCourses, and the author of an educational system focused on nutrition, healthy lifestyle, and the practical application of nutrition knowledge.
He graduated from the Faculty of Science at Masaryk University in Brno. Throughout his professional career, he has combined nutrition, education, and the practical application of acquired knowledge. His educational system also includes the ZOF (Zone of Optimal Functioning) learning application, where students turn theory into practical work with meal plans.
In 2007, he launched the first intake of a six-month course focused on the education of nutrition advisors. Over time, this course became the foundation for the further development of the educational system and a range of specialised courses.