In a hypothetical situation, would it be of grave matter not to be tested for a serious disease you thought you had potential symptoms of because the diagnosis would mean you would have to substantially change your diet and or be very inconvenient? Would it maybe depend upon the severity of symptoms and or whether or not your doctor thought you had it?
I don’t know about “grave matter”. It sounds very unwise.
The hypothetical person should make an appt w doctor and explain symptoms, get tested and follow doctor’s orders-inconvenient or not. Our bodies are temples of the Holy Spirit and we should take care of them.
May God give you wisdom and courage and strength. May he heal you w His love and mercy. May you feel His love around you, so you never feel alone.
In Christs love,
This from the Catechism (2288) may be helpful:
Life and physical health are precious gifts entrusted to us by God. We must take reasonable care of them, taking into account the needs of others and the common good.