The 38-year-old social commentator's comments came after a flight from Southend to Malaga was delayed, leading to 10 passengers being removed.
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After concluding that these people must have been overweight, Katie took to Twitter to give her thoughts.
Linking the story, Katie tweeted: "This EasyJet plane was too full with fatties to take off. How many times do I have to say it? Weigh in at check in."
Katie's comments were met by some backlash from users, with one replying: "Why on earth would you want to subject people to that kind of humiliation?"
Another blasted: "Oh do shut the f*** up and read the pilots comments re weather conditions. Idiot [sic]."
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But, as usual, Katie was undeterred. She greeted her followers this morning, throwing in a sly dig at overweight people.
She wrote: "Good morning good people of Britain. And to my fat friends – how are we doing? Continuing to live in denial? Or deciding to get a grip ?"
After recently gaining three-and-a-half stone to prove her point that being overweight means a person is lazy, Katie is now trying to shift it.
Her attempts will be documented on a TV show, set to be aired next year.