In the epy "Urgo" (Dom DeLuise, Peter DeLuise's dad starred), once Urgo was inside of the team's heads, he suggested they do things for him to experience. One of the things he did was enhance their tastebuds to get them to eat. O'Neill took over every slice of pie on the base and, once the rest of the team got there, Carter opted for blue jello.
Yeah Amanda said about this at teh SG4 convention.
She said tha twhen they were filming that epsidoe and all that stuff was laid out on the table the only thing she liked the look of was the blue jello and it just went from there!
But she said that you cant eat too much of it as it makes your mouth go blue!