This is partially correct. Transub is
held by Rome as the teaching of Aquinas. It holds that though the bread and wine hold the outward appearance of bread and wine they are in reality the physical body and blood of Christ. It's more complex than that, but that's the basic jist.
However, the word consubstantiation is typically used to describe the Lutheran position (though they prefer the term "sacramental union"). In this view the body and blood of Christ are also physically
present, though through a mystery of being hidden with, in, and under the material elements. EOs hold a somewhat similar view, in that the bread and wine are both bread and wine as well as
the physical body and blood of Christ through a mysterious operation of the Spirit. Some Anglicans hold to this also.
The view you are describing as consub is the view of Calvin and many Reformed, and is known as pneumatic presence.
That is Christ is present by the power of the Holy Spirit rather than physically. The Reformed would say they do believe in real
presence, but not in physical
presence. Many of the more reformed Anglicans held to some type of pneumatic presence, but Anglicanism has on the whole tried to kind of pretend they're not there being embarrassing.
Memorialism is the most common protestant view (especially since the term "protestant" is distasteful to modern Lutherans and Anglicans). This view is more along the lines of what we would today understand as "representational", though it isn't necessarily wrong to say the other views are also representational by medieaval standards.
Yeah yeah I know: old thread and not to the point. But I'm a nerd. I would say to the op that like all things, this is really dependent on the way the patient perceives what he or she believes. And the only way to know that is to ask. Some would have a problem with chewing but wouldn't have a problem with the officiant breaking the wafer. There are a few ways to get around it, as have been mentioned.
Quote from elkpark
Different denominations have different positions on this. The two theological principles are transubstantiation and consubstantiation. Transubstantiation (Roman Catholic doctrine (and maybe some other churches, I don't know) holds that consecration turns the wafer into the actual, physical body of Christ and they don't chew (some of the really hard core folks say that the reason you don't chew is because the wafer would bleed if you bit down on it -- they are that literal about it). Consubstantiation (the doctrine of most of the mainline Protestant denominations, AFAIK) holds that the wafer represents the body of Christ -- He is present spiritually in the Host and wine, but not physically. Those groups chew, and sometimes use "regular" bread (that you would have to chew) for the Eucharist. I grew up Lutheran and have been an Episcopalian most of my adult life, and chewing is acceptable/standard in both denominations.
Also, some of the nonliturgical denominations (Baptist, maybe Methodists (not sure about that), etc.) don't buy either concept and see the Eucharist as simply a memorial or reminder of the Last Supper, but don't consider either the bread or wine (juice) to have any special spiritual properties.