Simpson is rapidly approaching the 150-pound mark because of her love for Mexican food, margaritas and "anything fried", reports showbizspy.
"They've recently had some brutal fights, and finally Eric basically told Jess if she didn't lose weight soon, he was calling the whole thing off. Eric is a vegan. He exercises daily and counts every calorie. When they first began dating, Jessica happily ate the vegan food for the sake of love.
"But after a few months, she returned to her favourite down-home staples - fried chicken, mashed potatoes and macaroni and cheese. Jess waits until Eric leaves the house or falls asleep - and then she binge eats," the insider added.