Not surprising given the amount of sugar they contain.

Looking over the rest of the ingredients they're not all that great either, especially considering the price.

Something my mom used to do (back when moms actually cooked/prepared meals) was give us any vitamins/other pills at mealtime—before we could eat anything else. By then the kitchen/house smelled so good from whatever she was making that we were already starving and salivating, and would swallow anything just to get to the food!

Doc