The Ideal Subjects for a Salt Study? Maybe Prisoners


Leading scientists propose to track salt’s effects on health by controlling how much is given to inmate volunteers.

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CreditAnthony Russo

Suppose you wanted to do a study of diet and nutrition, with thousands of participants randomly assigned to follow one meal plan or another for years as their health was monitored?

In the real world, studies like these are nearly impossible. That’s why there remain so many unanswered questions about what’s best for people to eat. And one of the biggest of those mysteries concerns salt and its relationship to health.

But now a group of eminent researchers, including the former head of the Food and Drug Administration, has suggested a way to resolve science’s so-called salt wars. They want to conduct an immense trial of salt intake with incarcerated inmates, whose diets could be tightly controlled.

The researchers, who recently proposed the idea in the journal Hypertension, say they are not only completely serious — they are optimistic it will happen.

Earlier reporting on the salt debate

Dr. Daniel W. Jones, a professor of medicine and physiology at the University of Mississippi School of Medicine and former president of the American Heart Association, was alarmed by the bitter arguments and increasingly personal disputes between researchers who disagree about salt.

So he invited senior medical scientists on both sides of the debate to meet in Jackson, Miss., to figure out how to settle their differences.

“I wanted a balance between different points of view,” said Dr. Jones, who believes low-salt diets are healthier. “And I wanted people who had avoided the temptation of disparaging the motives of those who disagreed with them.”

Tellingly, those criteria “got me down to a small list of people to invite,” Dr. Jones said.

Those he invited, six in all, agreed to sit down to hash out their differences at the university in Jackson, Miss. (He later invited two other researchers — Dr. Eric Peterson, a clinical trials expert at Duke University, and Dr. Robert Califf, also at Duke and a former head of the Food and Drug Administration — to weigh in on the final paper.)

Dr. Jones and Dr. David McCarron, a nutrition researcher at the University of California, Davis, who worries that low-sodium diets are dangerous to health, led the discussion.

They began by putting the Institute of Medicine report before the group and highlighting the recommendation that there be a randomized clinical trial in a population whose diet can be controlled. Then they asked, “What are we going to do about it?”

“Is it not time for somebody to try to do this? And if the answer is yes, what is the ideal population?” Dr. Jones said, recalling the conversation.

For two days, the group debated and mulled over various options. Conduct the study among military personnel? Too young.

Nursing homes? Too many residents are already prescribed low-sodium diets.

The best option, by far, seemed to be people who were incarcerated.

So suppose you do the study in prisons, said Dr. Jones. Is the research supposed to benefit the prisoners or just the population in general? If the prisoners would not benefit, the study would be unethical.

People who are not incarcerated can choose how much sodium they consume, but prisoners cannot — they eat whatever the facility provides. If there is uncertainty about the ideal amount of sodium, the experts concluded, prisoners would benefit from a study that settled the matter.

The group consulted with Marc Morjé Howard, a professor of government and law at Georgetown University. He also teaches at a nearby maximum security prison.

“It’s a little bit of an ethical minefield,” Dr. Howard said in a telephone interview. “My concern would be that it not in any way be detrimental to prisoners’ health and it would be voluntary.”

But, Dr. Howard said, “I do think it is possible if it is done very, very carefully with the full cooperation of prison authorities.”

He added that many incarcerated people have outgrown their criminal pasts and have a desire to help society. “They want to repent,” he said.

“I wouldn’t be surprised at all if many people would say, ‘I would love to be part of this study,’” he added.

Dr. Macklin, in a telephone interview, also said many prisoners would be happy to jump in. She has taught in a maximum security facility and has studied the ethics of doing research in prisons.

“They would say they want to give back to society,” Dr. Macklin said. “Even if there are more self-centered reasons, any deviation from the routine of being a prisoner is welcome.”

Prison administrators have told Dr. Jones they would be willing to consider a proposal for a randomized trial of salt. He also will be speaking to the American Civil Liberties Union, which runs a project on inmate rights, to explain the study and why it addresses important questions for prisoners.

The plan is to start with a pilot project involving prisoners aged 55 and over. That would be followed by a large trial lasting about five years and involving 10,000 to 20,000 prisoners in that age group.

The researchers plan to request funding from the National Institutes of Health. Of course, Dr. Jones said, the trial at this point is just a proposal.

“There are a bunch of steps between here and there,” he said. “But we are a group of serious people, senior people who disagree strongly. We came together to find a solution.”

“It is sad that that is amazing. But it is amazing.”