In v4.5, the food combo bonus doesn't work. As the combo shown in Figure 3 in the game page (i.e. Berry, Hearty Yogurt, Creme Brulee, Yeast Sandwich, Chocolate Milkshake and Ultimate Milkshake) fed to Bonbon, she didn't get bonus of food combo, only base nutrition multiplied by player bonus.
In v4.4 food combo bonus still work.