The story of a Salvadoran
fisherman who says he survived more than a year adrift on the Pacific Ocean
raises many medical questions. The Associated Press spoke with Claude
Piantadosi, a professor of medicine at Duke University and author of the book
"The Biology of Human Survival", to find out what is physically
possible and for his view on the tale of Jose Salvador Alvarenga. This is an
edited version of the interview:
Q: How long can a human survive without any water, or without any food?
A: The average is about 100
hours (approximately four days) without water and about five or six weeks
without food. You can survive much longer with just a little food, although
you'll lose weight and run into vitamin deficiency problems. So it would have
been vital for Alvarenga to have collected both food and water during his
journey. The Pacific's regular squalls would have provided some rainwater that
he could have scooped from the bottom of his boat.
Q: How important is shade?
A: Absolutely critical. You
get significantly warmer in direct sunlight and sweat more. The pictures of the
boat show a fibreglass box in the middle which he could have sheltered in, and
any type of canvas would have helped keep him out of the sun.
Q: Alvarenga described catching turtles, fish and birds with his hands
and eating them. Is that plausible?
A: Over time, the underside
of the boat would have become its own ecosystem as barnacles, seaweed and
jellyfish collected there, which in turn attracts other creatures. How often
can you grab a turtle or catch a fish with your bare hands? I don't know. Bird
blood is no more salty than human blood, so would have provided some hydration.
Q: Without fruit and vegetables, wouldn't he have developed scurvy?
A: Actually, unlike humans,
birds and turtles make their own vitamin C, so fresh meat from those creatures,
especially the livers, would provide sufficient vitamin C to prevent scurvy.
British sailors used to get scurvy because they ate preserved meat which had
oxidized and lost its vitamin C.
Q: Wouldn't he get skin sores from all that water?
A: He'd need to keep
mopping himself off and stay dry to avoid that. People on life rafts, or say a
piece of floating wood, can develop real problems with macerated skin. Staying
out of the water is a huge advantage.
Q: There's some suggestion that Alvarenga was a large man before he
left. Would being overweight provide an advantage?
A: It would be a
significant advantage. He could live off his own body fat and muscle for a long
time, so long as he was able to get some water, vitamins, micronutrients and a
Q: Didn't he look too healthy, even a little bloated, when he arrived?
A: The appearances of
malnutrition can manifest differently depending on how short you are on
calories or protein. Some underfed children in Africa look like stick figures,
others get swollen. It's only in end stage starvation that people get that
really emaciated appearance.
Q: Alvarenga seemed to give confused and contradictory answers to
authorities. What kind of psychological effects would such a journey have?
A: I'm not an expert in
psychiatry, but we all have the feature of resilience. It can be trained or
even learned on the fly. For instance, soldiers learn to deal with combat
horrors. Presumably he was out on the ocean every day as a fisherman before he
went missing, so he would have been familiar with the environment and with
adapting his behavior to the elements.
If he had nutritional
deficiencies, he may have developed some dementia or other syndromes which
compromised his mental state. I'm not surprised that some of the answers he
gave were a bit off and he wasn't able to remember things.
Q: How long would it take to recover from a voyage like this?
A: Hydration can be
restored in just a day or two. Re-feeding can be tricky after a long period of
starvation, as the body can lose the ability to absorb nutrients. Muscle
rehabilitation and physical therapy can take several weeks.
Q: Bottom line – is Alvarenga's story plausible?
A: Yes. It's unusual to say
the least. But reports out of Mexico indicate he did go missing in late 2012.
As we have gotten more information, it's probably likely that he did survive at
sea for 13 months.
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