i used to suffer badly after too much bread, pizza, it was baaad.
since i fixed my zinc deficiency i am fine.
zinc patients tend to be low in zinc. that in my opinion is why some of the ms diets recommend avoiding gluten and legumes, both of which create an elevated demand for zinc in the body.
also "alcohol, oxalates such as rhubarb and spinach, stress, high calcium (JL edit: eg milk), high sugar intake, copper and low protein intake will all hamper the absorption of zinc."
FYI optimal serum zinc in places where gluten intake is low, averages very close to 18.2 umol/L.
re calcium/dairy, limiting it is good but taking it out altogether is overdoing it IMHO.
i eat 4 spoonfuls of vanilla yoghurt on days i have berries and yoghurt and granola for breakfast. i eat cheese, on the order of 4 triscuits' worth a day.
i never drink milk by the glass, and i rarely if ever consume things like milkshakes or ice cream.
as for sugar, why not treat yourself within reason, but make sure you get some zinc in ya to make up for it?
while my yogurt is sweetened for me, usually the only added sugar i have is in hot drinks. i put maple syrup in tea at home at the moment. at work i sweeten the coffee using the hot chocolate machine
if you supplement zinc, ensure it is properly balanced with copper so that you don't end up throwing your copper zinc balance out of whack.
my zinc supplement is 50mg and it includes 2mg copper.