This is a new version of Smooth Motive Drop (1.24). In the old version, hunger, hygiene, and energy dropped at a constant rate instead of slowing down and speeding up based on how high/low they were.
This is the same thing, except when hunger reaches -81, it slows significantly to give you time to save your sim's life. With the original version, if you waited too long to start feeding your sim, they could easily die during cooking.