First, while it is a question of medicine and health, I do not know the extent of how these people are sick and the extent of how it is seriously affecting their health. They have to consult their doctors personally. If it is not affecting them seriously, it is better to take the normal host, which the church has been using for 2000 years.
I know someone who had serious health issues, but with faith, he still received the normal host and it did not harm him. This experience could be an example for those people who are also having these issues, to continue with deep faith and still receive the normal host.
If however, they continue to have these serious health problems, the church allows the use of a host that contains a limited amount of wheat for the matter to remain valid. There are clear indications on how to make these from the authorities. In this case, these persons could accept these hosts.
Dear visitors of Gloria Dei and all who have already written or who will write a personal message to me. I am grateful for your attention, your kindness, for your spiritual support and especially for your sacrifices and prayers for me. God may reward you!