Anything hot, as in hot sauce. No hot wings for me or I'll be shooting flames. I've gotta eat the mild Mexican food too.
I've never been able to pin it down.
These days I know that milk is a major cause. I've become lactose-intolerant in my dotage.
Just Madonna !
First, you would have to define "materialistic".
Nobody truly NEEDS a personal computer ... Or even a telephone (let alone a cell phone).