Mummy Scans Reveal Clogged Arteries
The finding casts doubt on beliefs that modern vices cause heart attacks and strokes.
Scans of mummies from as long ago as 2,000 BC have revealed that ancient people also had clogged arteries, a condition blamed on modern vices like smoking, overeating and inactivity, a study said Monday.
The finding, published in the Lancet medical journal, casts doubt on our understanding of the condition known as atherosclerosis that causes heart attacks and strokes.
"The presence of atherosclerosis in premodern human beings suggests that the disease is an inherent component of human aging and not associated with any specific diet or lifestyle," states the study conclusion.
"A common assumption is that the rise in levels of atherosclerosis is predominantly lifestyle-related, and that if modern humans could emulate pre-industrial or even pre-agricultural lifestyles, that atherosclerosis... would be avoided," cardiologist Randall Thompson, one of the authors of the international study, said in a statement issued by Lancet.
"Our findings seem to cast doubt on that assumption, and at the very least, we think they suggest that our understanding of the causes of atherosclerosis is incomplete, and that it might be somehow inherent to the process of human aging."
This did not mean that lifestyle factors should be discounted, senior author Gregory Thomas, medical director of the Memorial Care Heart and Vascular Institute at Long Beach Memorial Medical Center in California, said.
They have been shown in study after study to contribute to the development of atherosclerosis, though the degree remains unclear.
"Our study demonstrates... that we are all at risk of atherosclerosis," said Thomas.
"We should do the very best we can to avoid these risk factors. We can not expect, however, that avoiding them will prevent atherosclerosis."
Atherosclerosis is a hardening and narrowing of the arteries that transport oxygen-rich blood from the heart, through a buildup of fatty material or cholesterol.
The World Health Organization considers smoking, physical inactivity, a high-salt, high-fat diet and high alcohol use as risk factors.
For this study, the researchers performed full-body computed tomography (CT) scans on 137 mummies from four geographic regions in modern-day Egypt, Peru, southwest America and Alaska.
The mummies were of people who had lived over a 4,000-year period stretching from ancient Egypt in about 2,000 BC to the Unangan hunter-gatherers who lived in the Aleutian Islands of modern-day Alaska as recently as 1930.
The team diagnosed "probable or definite" atherosclerosis in more than a third of the mummies on the basis of calcification of the arteries shown up by the scans.
A similar diagnostic method is used today.
The calcification was found in the same locations as in modern humans, and the appearance was the same.
"Our findings greatly increase the number of ancient people known to have atherosclerosis and show for the first time that the disease was common in several ancient cultures with varying lifestyles, diets and genetics, across a wide geographical distance and over a very long span of human history," the scientists wrote.
"These findings suggest that our understanding of the causative factors of atherosclerosis is incomplete."
The mummies of older people were more likely to show signs of the disease, just as in humans today.
Other research cited in the study has found atherosclerosis to be common in people living today, even ubiquitous in men by age 60 and women by 70.
"We simply don't know enough about the diet and lifestyle of the people studied to say whether behavior or genetics lies at the root" of the disease, the British Heart Foundation said in a comment on the study.
And Grethe Tell, an expert with the European Society of Cardiology, said the findings "do not refute" that an unhealthy lifestyle increased the risk of heart attack and stroke.
"Not everybody who has atherosclerosis (whatever the cause may be) gets clinical disease," she explained.
"Lifestyle factors increase the risk of heart attacks and may therefore be a triggering factor in the chain between atherosclerosis and heart attack."
According to the study, the ancient populations' diets had been varied -- including everything from shellfish and fish, game, domesticated cattle, sheep, pigs and ducks to a wide variety of berries, farmed maize, beans and potato -- even beer and wine in the case of the Egyptians.
None of the groups were known to be vegetarian, and physical activity was probably high.
Smoke inhalation may have played a role, as many of the communities used indoor fires for cooking and heating.
Clogged arteries previously observed in ancient Egyptian mummies had hitherto been attributed to a high-fat diet of the elite -- as poor people in those communities were not mummified.
The latest findings also refute that conclusion.
This CT with 3D volume rendering shows Hatiay, a mummified male Egyptian scribe aged 40-50 who lived in 1570-1293 BCE.
June 28, 2011 --
Hundreds of bodies stacked one of top of the other emerged during restoration work in the church of Roccapelago, a remote mountain village in north-central Italy. About one-third of the mass grave, consisting of 281 bodies of adults, infants and children, turned out to be mummies. "We found about 100 mummies. We can say that an entire community, who lived here from the mid-16th to the 18th centuries, has been naturally mummified. This is quite unique," Donato Labate and colleagues from the Archaeological Superintendency of Emilia Romagna said.
Found in the crypt of the church, the mummies have hands clasped in prayer and feature intact skin, tendons, and hair. The bodies were unearthed fully dressed with tunics, thick socks and caps.
According to Iolanda Silvestri and Marta Cuoghi Costantini, ancient textile experts of the Institute for Cultural and Artistic Heritage of Emilia-Romagna, the clothes reveal a simple lifestyle. "Forget silk or elaborate embroidery, these people were dressed for the mountains," the researchers said. Made from wool, linen and cotton of different thickness,the clothes often featured simple laces with geometrical patterns at the wrists and neck.
The mummified bodies were accompanied by various personal items such as rings, necklaces, religious medallions and crucifixes in various materials -- gold, silver, wood, stone and glass. The archaeologists also found some mummified mice, which probably died because of the toxic miasma generated by the mass burial.
The archaeologists also unearthed a well preserved letter. Known as "lettera componenda," it was supposed to serve as a sort of an agreement between God and the deceased. In the letter, the dead person asks for five pardons in exchange of prayers. The letter was found buried within the crypt and had probably been placed over one of the bodies.
Two openings in the church's wall ensured a constant airing within the crypt and helped the process of natural mummification. The researchers believe that the crypt was initially used as a traditional grave, with bodies buried in the ground. In a later period, dead people -- fully dressed and wrapped in bags or shrouds -- were dropped from a trap door in the floor of the church above.
Many bodies were found in very unusual postures. According to the researchers, the odd positions are due to the dropping from opening above. Most of the bodies were found stacked to form a pyramid. The top of this pyramid pile was in correspondence with the trap door above.
Study of the mummies, which has already started, reveals that several individuals were hard workers. Further investigations will try to shed light on the community’s lifestyle, the diet, diseases and hygiene. Research will include analysis of pathological conditions, osteological and histological examinations, investigations of teeth, DNA analysis, as well as the creation of 3D facial reconstruction of some of the most interesting mummies.
According to the researchers, the investigation is particularly interesting because it involves a small and rather isolated community of people whose lives centered around the church of Conversione di San Paolo Apostolo in Roccapelago, in the middle of the Emilia Romagna Apennines. At the end of the study, some mummies will be displayed in the church. The other bodies will be moved from the laboratory in Ravenna where they are now being examined, and buried within the grounds of the 16th century church.