The reason why the animated dinosaur eats sweets is because sweets have high energy and good taste.

1. Sweets are high in energy: Sweets usually contain a lot of sugar, which can quickly provide energy to meet the physical needs of dinosaurs. During the evolution of dinosaurs, eating sweet foods may have helped them better adapt to their environment.

2. Sweets taste good: Sweets usually have an attractive taste and aroma, which can stimulate the taste and smell of dinosaurs and satisfy their appetite. Dinosaurs may have had a sweet tooth, just as modern humans enjoy chocolate, candies and other desserts.