How do we know that transubstantiation is not true?

The concept of transubstantiation, proposed by some traditions, holds that during the Mass, bread and wine are transformed into the very body and blood of Christ. However, this notion contradicts both Scripture and the sensible understanding of the elements involved. According to 1 Corinthians 11:26, Paul repeatedly refers to the elements as bread, emphasizing their continued identity after they are blessed. Additionally, the view of Christ's physical body as being present in multiple locations simultaneously is deemed impossible and unreasonable; it undermines the nature of Christ's human form, which cannot be in more than one place at the same time (Acts 1:9-10). Consequently, interpreting Christ's words 'This is my body' figuratively aligns with the metaphorical language present throughout Scripture, affirming that He does not mean the bread literally transforms into His body.