Today, a research group have a theory and think they have solved why today's terrestrial animals are so much smaller than sauropod dinosaurs. They believe it was because the huge dinosaurs would not chew their food before swallowing. The dinosaurs would swallow the food down. By not chewing the food and taking so much time to eat it would go straight down and collect in the stomach making the animal so large. The research group believes this as Jurassic fast food.
I think this is true. The animal did spend so much time eating that it would just keep growing and growing. They also rarely got exercise. By chewing your food it digests faster also. So that way by not chewing it could not break down easily. That is why i think that theory is true.