Soya beans are obtained from soya (Glycine max), a leguminous plant which differs in several varieties, about 30: black, yellow, 84 cm high or 110, etc.
They are utilized in the alimentary field in two ways:
Decorticated
Decortication removes the bark and is carried out industrially by means of machines with carved discs that, turning in various directions, remove the tegument that is removed with air blows.
Undecorated
Integrals
All that needs to be done is to establish whether it is natural soya or GM transgenic soya.
It's a rather controversial food.
On the one hand, some studies draw attention to isoflavones present in soy that help defend the cardiovascular system by regulating cellular and enzymatic functions in situations such as inflammation, thrombosis and atherosclerotic progression (1).
On the other hand, it is feared that it may cause damage, particularly to Alzheimer's disease, if ingested in the form of an industrial product. This study analyses the problem (2).
Infant formulae, so-called SIFs containing soybean meal, were introduced almost 100 years ago. This study analyses their safety (3).
With regard to the allergenicity of soybeans, an attempt was made to identify which proteins (representing 35-40% of the dry weight of soybeans) are at risk, in order to develop hypoallergenic soybean products for sensitive people (4).
The results of this study showed that feeding male rats with large amounts of soybeans could induce aggressive behaviour (5).
Soya beans studies
References___________________________________
(1) Soya isoflavones and evidences on cardiovascular protection.
González Cañete N, Durán Agüero S. Nutr Hosp. 2014 Jun 1;29(6):1271-82. doi: 10.3305/nh.2014.29.6.7047. Spanish.
(2) A possible cause of Alzheimer's dementia - industrial soy foods. Roccisano D, Henneberg M, Saniotis A. Med Hypotheses. 2014 Mar;82(3):250-4. doi: 10.1016/j.mehy.2013.11.033. Epub 2013 Dec 7.
(3) Safety of soya-based infant formulas in children. Vandenplas Y, Castrellon PG, Rivas R, Gutiérrez CJ, Garcia LD, Jimenez JE, Anzo A, Hegar B, Alarcon P. Br J Nutr. 2014 Apr 28;111(8):1340-60. doi: 10.1017/S0007114513003942. Epub 2014 Feb 10. Review. PMID: 24507712
(4) Protein profile of mature soybean seeds and prepared soybean milk. Capriotti AL, Caruso G, Cavaliere C, Samperi R, Stampachiacchiere S, Zenezini Chiozzi R, Laganà A. J Agric Food Chem. 2014 Oct 8;62(40):9893-9. doi: 10.1021/jf5034152.
(5) Soya bean rich diet is associated with adult male rat aggressive behavior: relation to RF amide-related peptide 3-aromatase-neuroestrogen pathway in the brain. Abdel-Aleem GA, Shafik NM, El-Magd MA, Mohamed DA. Metab Brain Dis. 2019 Aug;34(4):1103-1115. doi: 10.1007/s11011-019-00431-2.
Dehulled soya beans 
