I have disabling fatigue.
I can't tolerate the fatigue drugs so I drink caffeine (lots of coffee) to combat the fatigue.
Caffeine inhibits the body's ability to absorb iron from food.
I have low levels of iron and have been unable to increase levels through food, so take iron supplements.
Iron supplements cause constipation so I have increased my intake of fiber.
Increased fiber reduces the effectiveness of my thyroid medication which is needed to regulate my body's ability to do everything.
So if I take thyroid meds, I can't increase fiber which means I can't tolerate iron supplements which means I get more anemic which increases fatigue so I drink more coffee and absorb less iron and take more iron supplements and take more fiber and take more thyroid meds and get more fatigued so drink more coffee...