Because, like America, England, and some other countries, China did not like what Germany was doing. they were forcing christianity on people, on jewish men and women, and they didnt like that so they rebeled, and when that happened, they started bombing places making camps to "enslave" in a way, the Jews because they did not accept there religion. in a way, they were the bullies, and America, China, England, and France, did not like that, so they declared war to protect the innocents.
They can be if the person is taking in too many calories. It is really the sodium and sugar that is the problem. A family history of hypertension also contributes to increase incidence.
