1, sharks eat people just by instinct. Most kinds of sharks are carnivores, and man is a kind of animal, so when he is in front of hungry sharks, he will naturally be eaten.

2. If sharks often eat people, it means that the shark's living environment has been destroyed, or the shark's own experience makes him feel that danger is everywhere, so he will eat people and attack humans.

Eating: Most sharks feed on marine animals such as fish. Sharks feed on injured marine mammals, fish and carrion, and eliminate the weaker members of animals. Sharks also eat rubbish and other wastes left by ships. In addition, some sharks also hunt all kinds of marine mammals, fish and animals such as turtles and crabs. Some sharks can go without food for months, and the great white shark is one of them. It is reported that great white sharks only eat once every one or two months.