To understand what happens, let's go to the main story, Wheatley caused a great disaster in Ponyville by stepping on a pin brooch of a pony named Sweety Bell fell silent on. The mood of our changing change was angrier than usual and when his friends wanted to cheer him up, he BECAME A T-REX and destroyed one thing, when he could remove that pin from his foot, he returned to normal, but now he has to pay… Pay a high price because the mayor wanted me to pay all the damage.
After paying wheatley he was bankrupt, they had to pawn the house where he lived together with Lara, they went to live with twi clown and again to return to the top, but this change had consequences in both buggos, wheatley began to lose weight because the work required all the honey she could sell and Lara was left hungry.
This is the story of why a changeling should not eat pony food