So, recently my 5y.o. was brought to have her first Happy Meal(TM) by a well-meaning friend... and she came back more irritable later in the day (in fact, she had a crying fit and then fell asleep late afternoon and through the night, missing dinner entirely).
Curious about whether the sugar content might have been the culprit (as I hear from other parents), I went to McDonald's website to look up the nutritional info of the meal she had.
The user interface was friendly and kind of fun to use. I could select foods to add to my tray, and then at the end, go to "my tray" and see the total nutritional values of my selected items. Total amounts such as calories, carbs, fat, sodium, protein were conveniently calculated for me.. but SUGAR was blatantly missing.
In the end, I had to click "more info" of each item to expand it, look up the sugar amount within the whole page of info, then add up the values by hand (and that is when I learned that my little one had a whopping 98g of sugar in a single meal on that day).
Any good reasons why sugar was left out of this "full nutritional summary" (as mentioned at the top of the page) ;-)
BTW this is at mcdonalds.ca but I suspect that it is similar in the States.