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Year of reckoning for nutritional science — red meat studies point the way forward – CBC.ca

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One of the more controversial studies we reported on this year on Quirks & Quarks was about the latest science on the health risks of eating red and processed meat

The study raised strong objections from some, but others praised its rigour and suggest it is a milestone and could guide the way forward as the we more critically evaluate the quality of nutritional science studies. 

Scientists conducted five systematic reviews and meta-analyses and published them this fall in the journal Annals of Internal Medicine. They concluded that eating moderate amounts of red or processed meats poses a “very small” risk to our health. 

The system the scientists used in those studies is a standard many experts believe should widely adopted as a way to wade through the flip-flopping headlines about nutritional research.

“A fundamental problem with nutrition science for decades has been that we’ve relied on a very weak kind of science,” Nina Teicholz, told Quirks & Quarks host Bob McDonald. Teicholz is a science journalist and executive director of the Nutrition Coalition — a non-profit organization that doesn’t accept industry funding,

It’s a little bit like we’ve been playing a game of soccer with no referees.– Nina Teicholz, Nutrition Coalition

Nutritional advice often comes from observational studies that show associations between some foods and health outcomes. Many critics say these studies can be unreliable. For one thing it can be hard to tease out the effect of lifestyle factors from the health outcomes. The studies are also often based on surveys that ask people about their diets, and it can be difficult for people to accurately recall and report what they’ve eaten.

“When you test these weak associations in a proper rigorous clinical trial, it turns out those weak associations are only shown to be correct zero to 20 per cent of the time,” added Teicholz.

Systematically assessing study quality

“The red meat studies were really a milestone,” said Teicholz.  She added that the system those scientists used for grading nutritional studies “really brings discipline to the field that it has not had in the past.”

“It’s a little bit like we’ve been playing a game of soccer with no referees.”

The scientists who conducted the meat studies used a system known as GRADE to prioritize strong science over weak science. An observational study would be graded lower than a randomized, controlled trial and strong associations graded higher than weak associations.

“[GRADE] was recommended by the National Academy of Sciences for the use of our U.S. dietary guidelines. So that’s the highest recommendation in the land for our most important nutrition policy,” said Teicholz. 

“I think that the future of nutrition [science] will include GRADE,” she added.

It’s hard to trust nutrition science headlines — many say it’s time for an overhaul (Stephen Chernin / Getty Images)

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Worldwide coronavirus cases cross 161.42 million, death toll at 3,488,751

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More than 161.42 million people have been reported to be infected by the novel coronavirus globally and 3,488,751​ have died, according to a Reuters tally.

Infections have been reported in more than 210 countries and territories since the first cases were identified in China in December 2019.

Interactive graphic tracking global spread of coronavirus: open https://tmsnrt.rs/2FThSv7 in an external browser.

Eikon users can click  for a case tracker.

The following table lists the top 50 countries by the number of reported cases. A complete list is available with the above links.

COUNTRIES AND TOTAL DEATHS CONFIRMED DEATHS PER

TERRITORIES CASES 10,000

INHABITANTS

United States 584,768 32,926,288 17.9

India 262,317 24,046,809 1.94

Brazil 430,417 15,433,989 20.55

France 107,423 5,848,154 16.04

Turkey 44,301 5,095,390 5.38

Russia 254,590 4,922,901 17.62

United Kingdom 127,668 4,446,824 19.21

Italy 123,927 4,146,722 20.51

Spain 79,339 3,604,799 16.95

Germany 85,903 3,579,871 10.36

Argentina 69,254 3,242,103 15.56

Colombia 79,760 3,067,879 16.06

Poland 71,311 2,849,014 18.78

Iran 76,433 2,732,152 9.34

Mexico 219,901 2,375,115 17.43

Ukraine 47,620 2,143,448 10.67

Peru 65,316 1,873,316 20.02

Indonesia 47,823 1,734,285 1.79

Czech Republic 29,857 1,651,178 28.09

South Africa 55,012 1,605,252 9.52

Netherlands 17,423 1,589,282 10.11

Canada 24,825 1,312,408 6.7

Chile 27,520 1,266,601 14.69

Iraq 15,910 1,134,859 4.14

Philippines 18,958 1,131,467 1.78

Romania 29,413 1,070,605 15.11

Sweden 14,275 1,037,126 14.03

Belgium 24,645 1,026,473 21.56

Pakistan 19,384 873,220 0.91

Portugal 16,999 841,379 16.53

Israel 6,379 839,076 7.18

Hungary 29,041 796,390 29.71

Bangladesh 12,102 779,535 0.75

Jordan 9,203 722,754 9.24

Serbia 6,646 705,185 9.52

Switzerland 10,179 679,510 11.96

Japan 11,396 673,821 0.9

Austria 10,455 635,780 11.83

United Arab Emirates 1,626 543,610 1.69

Lebanon 7,569 534,968 11.05

Morocco 9,091 514,670 2.52

Malaysia 1,822 462,190 0.58

Nepal 4,669 439,658 1.66

Saudi Arabia 7,134 431,432 2.12

Bulgaria 17,194 413,320 24.48

Ecuador 19,442 405,783 11.38

Slovakia 12,168 387,162 22.34

Greece 11,322 373,881 10.55

Belarus 2,681 373,351 2.83

Panama 6,288 369,455 15.05

Source: Reuters tally based on statements from health ministries and government officials

Generated at 10:00 GMT.

 

(Editing by David Clarke)

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Canada plots course to fully vaccinated return to gatherings in fall

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Canada on Friday said there would be a gradual return to a world with indoor sports and family gatherings as more people get vaccinated, but it did not go as far as the United States in telling people they could eventually ditch their masks.

Canada has administered one dose of a COVID-19 vaccine to just over half its adult population, and the country may be over the worst of its current third wave of infections, Chief Public Health Officer Theresa Tam said.

On Thursday, the U.S. Centers for Disease Control and Prevention (CDC) advised that fully vaccinated people do not need to wear masks outdoors and can avoid wearing them indoors in most places, guidance the agency said will allow life to begin to return to normal.

On Friday, Canada‘s public health agency offered guidelines to the 10 provinces, which are responsible for public health restrictions.

The agency says once 75% of Canadians have had a single dose and 20% are fully vaccinated, some restrictions can be relaxed to allow small, outdoor gatherings with family and friends, camping, and picnics.

Once 75% of those eligible are fully vaccinated in the fall, indoor sports and family gatherings can be allowed again.

“I think masks might be the last layer of that multi-layer protection that we’ll advise people to remove,” Tam told reporters, noting that in Canada colder temperatures meant people would start spending more time indoors in the fall.

“We are taking a bit of a different approach to the United States,” she added. While in most of Canada masks are not required outdoors, they are mandatory indoors.

Less than 4% of Canada‘s adult population has been fully vaccinated compared to more than 36% of Americans.

Prime Minister Justin Trudeau, who has promised that everyone who wants to can be fully vaccinated by September, this week spoke of a “one-dose summer” and a “two-dose fall” without explaining what that might look like.

 

(Reporting by Steve Scherer and David Ljunggren; Editing by Hugh Lawson)

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Delayed 2nd Pfizer/BioNTech shot boosts antibodies in elderly; COVID-19 obesity risk higher for men

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The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19, the illness caused by the virus.

Delaying second Pfizer/BioNTech dose boosts antibodies in elderly

Delaying the second dose of the Pfizer/BioNTech COVID-19 vaccine beyond the originally recommended three-week gap used by the companies in clinical trials appears to induce a stronger antibody response in the elderly, UK researchers found. Shortly after the vaccine became available, UK health officials advised that the second dose should be given 12 weeks after the first to allow more people to get protected by a first dose early on. In a new paper seen by Reuters and expected to appear on medRxiv on Friday ahead of peer review, researchers found that among 175 people ages 80 to 99, those who got their second dose at 12 weeks had antibody responses that were 3.5 times higher than those who got it after three weeks. Antibodies are only one part of the immune system, and vaccines also generate T cells that fight infections. The peak T cell responses were higher in the group with a three-week interval between doses, and the authors cautioned against drawing conclusions on how protected individuals were based on which dosing schedule they received. (https://reut.rs/3wjPK9B)

Impact of obesity on COVID-19 risks may be greater in men

The known increased risk of severe COVID-19 and death linked to obesity may be even more pronounced for men than women, new data suggest. Researchers studied 3,530 hospitalized COVID-19 patients with an average age of 65, including 1,469 who were obese. In men, moderate obesity was associated with a significantly higher risk of developing severe disease, needing mechanical breathing assistance and dying from COVID-19. (The threshold for moderate obesity is a body mass index (BMI) of 35. In an 5-foot, five-inch tall (1.65 m) adult, that would correspond to a weight of 210 pounds (95 kg). In women, however, only a BMI of 40 or higher, indicating severe obesity, was linked with the increased risks. In a report published in European Journal of Clinical Microbiology & Infectious Diseases, the researchers note that while obesity is known to be linked with body-wide inflammation, patients’ levels of inflammatory proteins did not appear to explain the association between obesity and severe illness. For now, they conclude, “particular attention should be paid” to protecting patients with obesity from the coronavirus, “with priority to vaccination access, remote work, telemedicine, and other measures given the higher risk of adverse outcomes once they are diagnosed with COVID-19.” (https://bit.ly/3eO6GiA)

COVID-19 testing rates low among symptomatic Americans

Sick Americans appear to be passing up opportunities to get tested for coronavirus and thus are likely unknowingly spreading the infection throughout their communities, new research shows. Among 37,000 adults across the United States who participated in a smartphone app survey between March and October 2020, nearly 2,700 reported at least one episode of fever and chills. But according to a report published in JAMA Network Open, only a small fraction reported receiving a COVID-19 test result within seven days of the onset of illness. At first, as tests became more accessible, the numbers improved. In early April 2020, less than 10% of survey participants reporting illness with fever received test results within a week. By late July, that proportion had increased to 24.1%. Throughout the summer and fall, as tests became easier to find, the number of sick participants who reported getting tested remained flat. By late October, only 26% reported receiving a test result within a week of febrile illness. “It’s shocking to me that when people have a fever they’re still not getting tested,” said coauthor Dr. Mark Pletcher of the University of California, San Francisco. “Tests are easy to come by. People might have coronavirus, might be spreading it to their friends and neighbors, and they’re not getting tested.” (https://bit.ly/2QUyMzf)

Open  in an external browser for a Reuters graphic on vaccines in development.

 

(Reporting by Nancy Lapid, Alistair Smout and Ronnie Cohen; Editing by Bill Berkrot

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