Researchers said it could prevent 100,000 heart attacks and 92,000 deaths every year.The researchers were from the University of California,San Francisco,Stanford University and Columbia University.They and public health professionals in the United States are interested in a national campaign to persuade people to eat less salt.　37　 

　　However,some scientists say such a campaign is an experiment with the health of millions of people.

　　Michael Alderman is among the critics(批评家).He is a high blood pressure expert and professor at Albert Einstein College of Medicine in New York.Doctor Alderman says that eating less salt results in lower blood pressure.　38　And he says salt has other biological effects.He says calling for reductions in the national diet could have good effects,but it could also have harmful results. 

　　Another critic is David McCarron,a nutrition and kidney(肾) disease expert at the University of California.He and his team looked at large studies of diets in 33 countries.　39　Most of them eat more salt than American health officials advise. 

　　Doctor McCarron says the worldwide similarity suggests that a person’s brain might decide how much salt to eat.

　　Both Doctor McCarron and Doctor Alderman have connections to the Salt Institute,a trade group for the salt industry.Doctor Alderman is a member of an advisory committee.　40　 Doctor McCarron is paid for offering scientific advice to the Salt Institute. 

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