I have RA and have done some checking into this I have reduced the amount of gluten in my diet and so far it has coincided with a reduction in symptoms however each person is different so it needs to be tried out by each individual.
No
low gluten
Gluten doesn't affect psoriasis at all.
Arthritis does not effect a chromosome.
No
There are many different forms of arthritis and what would affect some would have no affect on others.
Inflamatory arthritis like rheumatoid can.
Psoriatic arthritis should not affect your stomach. Arthritis is painful swelling of joints, and does not affect the stomach. Psoriatic arthirits is a complication of the skin disorder psoriasis, itchy, red lesions on the skin.
No
No
Rainy days can affect arthritis by causing joints to ache or even swell. Changes in temperature and air pressure often cause painful swelling in joints affected by arthritis.
Go to the related link below (Gluten-Free Diet for Rheumatoid Arthritis) for some information on this. I must admit that on occasions when I eat less bread then I usually do I do seem to have less trouble with my RA, However there is still no definitive answer to the question whether it will help you or not the article I am pointing out here seems to look at this in a reasonable manner.
The affect that arthritis has on your life depend on what sort of arthritis you have as well as the damage done by it to your system. For example if you wake up to the fact that you have the problem early on a lot can be Dore to slow the progression of the disease.