Obesity correlated to IQ? As if! Obesity correlated to IQ? As if! By Jaime 15 on March 16, 2011 In Meredith Melnick’s article “Toddlers' Junk-Food Diet May Lead to Lower IQ” she speaks about how obese people have lower IQ’s than skinny people and how this is developed not just out of the blue, but develops over time.