If somebody has autoimmune illnesses and doesn’t do well with a lot of plant based foods, is it ever morally ok to choose your well-being over an animals?

To elaborate, if someone has autoimmune conditions that are made worse by alot of plant based foods. Like the main plant based proteins legumes and lentils soy, grains, nuts and more. And when this said person eats meat they feel much better, and have tested it multiple times, is there EVER an exception for someone like this?

How important is someone’s wellbeing? Let’s say they suffer ALOT from eating plant based, to the point where it severely negatively affects their life, im just curious if people here think there’s any point at which it’s ok for this said somebody to eat meat.