The Relationship Between Potions and Obesity: Between 1987 and 2005, potion sizes increased both inside and outside the home for all categories except pizza. For example, hamburger potions expanded by 23 percent. Similarly, a potion of Mexican food was 27 percent bigger; Soft drink potions increased in size by 52 percent; Snack potions, whether they be potato chips, pretzels or crackers, were 60 percent larger.