Back in 2009 I was overweight but didn't feel ill.
Then I started a whole grain diet without processed foods and lost weight without calorie counting (actually on a slightly hypercaloric diet eating every 3 hours, lots of home baked bread etc).
In 2011 this diet caused me such a vascular degeneration that I landed in the hospital taking heparin and then took warfarin for 1.5 years. The medication worsened my health quickly since it messes up t
he metabolism of vitamin K2 (and energy).
In 2013 I went gluten free and never looked back. It has been a huge improvement for me, but then eating high lectin foods in replacement to gluten put me back to where I was before.
Also in 2013 I went dairy free and it didn't help me at all, I think on the contrary. But I don't drink milk, and we found out that my husband doesn't tolerate milk, but is fine with cheese.
Eating a lot of vegetables didn't help because I was eating very low carb back in 2014 and a metabolic acidosis made me intolerant to salicylates, nitrates, oxalates, phenols. When I recovered from it then anemia (despite of eating a lot of meat daily) made me oxalate intolerant again in 2015.
Then I finally learned that I need a high carb, high protein, medium fat diet.
Right now I have been successfully juggling my lysine/arginine intake to deal with a virus problem and watching my lectin intake to avoid pain. Paying attention to
Th1 /
Th2 balance has been helping immensely as well.
Gluten is out forever I guess, and nuts and seeds are very limited in my diet for now. Funny thing though is that I tolerate legumes very well, but my husband (who is also ill but doesn't have autoimmunity AFAIK) doesn't. He can even eat gluten every now and then without pain, but the high molybdenum in legumes puts him down within just a couple of hours (sciatica mainly).
I found out that I can only sleep well if I eat some starch at dinner and have been rotating rice, potatoes, sweet potatoes and something baked with rice flour. Bananas are poison to my joints though
. EDIT TO ADD (broccoli sprouts, i.e. natural glutathione, and melatonin helped to reverse the worse joint pain I ever had).
We haven't been tested for insulin resistance yet, but we both have many of its symptoms (mine are mostly gone after my low-carb phase).
So yes, diet plays a huge role for both DH and I, and it has been a very personal journey. Eating the right foods has been keeping us supplement- and medication-free most of the time.