Be level 20. Have an OnlyFats account yourself. Make content and use the massive cash flow from that for advertisement for Dizzy's. Just tested this myself and it works. Being level 20 unlocks Medical Miracle which allows you to lose weight yourself, while eating like a piggy for the OnlyFats.
Also the level 20 skill helps lure feeders into being blobs. As you can just lose the weight yourself with a dedicated few days of nothing but weight loss pills from the pharmacy.