In different periods, about 7000 kinds of plants and hundreds of animals are used as food by humans  The loss of species will reduce the diversity of food and make humans rely on only a few main foods, thus breaking people's balanced diet  In addition, with the loss of species in forests and fields, it may lead to the increase of some pathogens, These pathogens are the main culprits of diseases infected by organisms  Some animals, plants and microorganisms that are most likely to become extinct are actually buffer zones for the spread of infectious diseases
The relationship between species diversity and disease infection is subtle
 They bear the invasion of many diseases on behalf of humans before they are infected