GarryTait said
"The body of information is still developing, but hopefully this article from the Lancet is an appropriate response.
https://www.eurekalert.org/pub_releases/2017-08/tl-tlr082517.php
Diets high in carbohydrates (average of 77% energy from carbohydrates) were associated with a 28% higher risk of death, compared with low carbohydrate diets (46% energy from carbohydrates) [7.2 deaths per 1000 people years, compared with 4.1]. Rates of major cardiovascular events remained similar for low and high carbohydrate diets.
Comparatively, diets with high total fat intake (35.3% energy from fat) were associated with a 23% lower risk of death, compared with low fat diets (11.0% energy from fat) [4.1 deaths per 1000 people years in people, compared with 6.7]. Rates of major cardiovascular events remained similar for low and high fat diets.
The trends were similar when looking at saturated fats, with very low intake (below 3%) associated with a higher risk of mortality, compared to diets with a higher intake of saturated fats of up to 13%. Similarly, diets with very low intake of mono and polyunsaturated fats (3.6% and 2.2%) were associated with a higher risk of mortality, compared to diets with higher intakes (13% and 9.1%).
Saturated fats are typically found in animal fat products, like milk and meat, while monounsaturated and polyunsaturated fats are typically found in vegetable oils, olive oils, high fat fruits like olives and avocados, nuts and fish.
Writing in a linked Comment, Drs Christopher Ramsden and Anthony Domenichiello, National Institute on Aging, USA, says: "The relationships between diet, cardiovascular disease, and death are topics of major public health importance, and subjects of great controversy... The PURE study is an impressive undertaking that will contribute to public health for years to come. Initial PURE findings challenge conventional diet-disease tenets that are largely based on observational associations in European and North American populations, adding to the uncertainty about what constitutes a healthy diet. This uncertainty is likely to prevail until well-designed randomised controlled trials are done."
As for replacing our evolved diet with another, that appears to be exactly what we have done with the advent of agriculture and the introduction of massive amounts of carbs. To deny that meat has a healthy place in our diet goes against our evolutionary role over perhaps 2 million years or more. And basic dietary facts, as there are nutrients which can only be gotten in many clinate zones from meat consumption. (If trucks didn't bring bags of California almonds, and vitamin A supplements)... Thus to compare consuming meat to burning coal isn't a logical comparison.
Given what we know about the gut biome, and how central it is to our immune system and health in so many ways, the gut fauna outnumbering the cells of our body, it seems dicey / optimistic to take a co-evolved system of millions of years and fundamentally change it's environmental inputs.
Yes, people are too sedentary. Yes, their diet is overly rich.
Is grass fed beef critical to the failure of our global climate, - not a strong case.
So, perhaps your dietary advice will help the climate, by increasing mortality...
Edited by GarryTait, 2019-11-01 03:53:41"The study you reference is extremely flawed.There are major methodology issues along with missing key points such as:
-Lumping all carbs together as if they are the same. Eating a lollipop is not the same as eating sweet potatoes.
-The study misses the fact that most of their study participants are from poverty stricken areas that likely eat highly processed cheap foods. If anything the study confirms that poverty stricken areas lead to poorer health overall.
There are so many flaws with this study that it has been extensively reviewed by respected bodies such as:
https://www.hsph.harvard.edu/nutritionsource/2017/09/08/pure-study-makes-headlines-but-the-conclusions-are-misleading/
Some key points from the Harvard review:
Key methodological problems
“Total carbohydrates” is over-simplified. Since carbohydrate foods range from fruits, vegetables, legumes and whole grains to refined grains and added sugars, it is important to consider both quality and quantity of carbohydrates—rather than grouping them all together. Different types of carbohydrates have different effects on health. [2]
Such high carbohydrate intake may indicate a ‘poverty diet’. Most study participants located in low-income countries subsisted almost entirely on carbohydrates, “especially from refined sources.” In Bangladesh for example, the authors list white rice as the top contributor of not only carbohydrates, but also protein and total fat. A ‘poverty diet,’ which is common in poor rural areas, is also typically high in sodium and low in animal products and vegetable oils. In this situation, it is extremely challenging if not impossible to separate the effects of diet from poverty and under nutrition.
Incomplete assessment and analysis of types of fat. Unlike carbohydrates, the study does break down total fat intake into saturated, monounsaturated, and polyunsaturated fats. As the authors acknowledged, the study did not assess trans fat intake (which is particularly high in South Asia [3]), which may have confounded associations for other types of fat. The PURE study found that substituting saturated fat for carbohydrates did not lower mortality risk, but substituting polyunsaturated fat for carbohydrates was associated with lower mortality. Interestingly, the study did not examine the effects of substituting polyunsaturated fat for saturated fat. Randomized clinical trials have found that while replacing saturated fat with carbohydrates had no effect, swapping saturated fat with polyunsaturated fat significantly reduced the risk of cardiovascular disease. [4]
Reliability of dietary intake data. In Chinese participants (which constituted almost one third of the total study population), average total fat intake is noted as 17.7% of total daily calories, yet other surveys have found an average intake of around 30% of daily calories from fat in China. [5] Such a large discrepancy is puzzling because similar dietary questionnaires were used in the PURE study and other Chinese studies.
Heres another:
https://www.pcrm.org/news/news-releases/pure-study-killer-carbs-or-poor-living-conditions
Again key points:
High carbohydrate intake was a red flag for poverty. Unfortunately, the authors missed it. Even though they admitted that “most participants from low- and middle-income countries consumed a very high carbohydrate diet (at least 60 percent of energy), especially from refined sources…,” they did not make the connection.
Poor living conditions kill. Poverty is linked to not only low food access, but poor living conditions. These i:nclude smoke exposure from poorly ventilated stoves and lamps (used by one-third of the world’s population), contaminated water and air, and a lack of both preventive and therapeutic medical care.2,3 All of these greatly increase one’s risk of dying. To illustrate the massive impact of poverty, a study of more than 217,000 people in India found that individuals with the fewest assets had a 294 percent higher risk of dying than those with the most assets.4
…And researchers did not fully control for living conditions. Investigators did try to account for poverty via education and even household income. However, statistical tools couldn’t capture the vastly different living conditions between groups. To illustrate: An educated person living in a polluted, poor city may be in greater danger than a less-educated person in a clean city with guaranteed medical access.
They mistook “wealth” foods for health foods. In many places around the world, only the wealthy can afford foods high in fat and saturated fat, like animal products. As a result, these nutrients can act as a marker for lifesaving affluence. Indeed, researchers found that people in the wealthiest regions—Europe, North America, and the Middle East—consumed more total fat and saturated fat than people in lower-income areas. Yet investigators didn’t adequately control for this. Instead, they concluded high-fat foods must be good for you, while in fact being well-off is good for you.
Researchers did not distinguish between healthy and refined carbohydrates. Despite breaking fat down into specific types, PURE study investigators considered all carbohydrates equal, from soda to sweet potatoes. Yet decades of science tells us this simply isn’t true—the body handles lentils differently than lollipops.
Researchers did not report added fats used in recipes. Researchers listed top sources of carbohydrates, protein, and fat for each country in published supplementary material. In several poor countries, the main source of carbohydrate consumed was also a top source of protein and fat, for example white rice in Bangladesh. As these sources of refined carbs are very low in fat, this implies that fats have been added in the preparation of these foods. That makes it very difficult to separate the impact of fat versus carbohydrate on health outcomes.
Other findings from the same study contradicted their conclusions. Perhaps unsurprisingly, the PURE study also showed that eating healthful carbohydrate-rich foods—like fruits, vegetables, and legumes—was linked to a lower risk of death.5 This further implies that high carbohydrate (especially refined carbohydrate) intake was a sign of poverty and nothing more.
A one-time survey was used to measure what people ate…for the next seven years. Diets are rapidly changing around the world. It seems unlikely that a single questionnaire accurately captured what people ate, year after year. Yet that’s the only way researchers measured people’s diets.
And this one:
https://www.foodpolitics.com/2017/09/the-pure-study-lets-get-skeptical/
When you discuss the introduction of massive amounts of carbs you need to separate good from bad. Yes i agree people do eat large amounts of highly processed carbs and that is a problem. However, people eating large amounts of lentils, beans and potatoes is not a problem! Also, eating plant based diets does not require almonds from California and vitamin A lol. You could actually eat a whole food plant based diet by eating locally! Yes, we are blessed in this area as we can eat lentils, beans, soy, vegetables and fruits all grown within 100 miles of us or closer.
As part of our advancement as a society we have enabled ourselves to eat healthier and have access to foods once inaccessible. This is a good thing for people who typically would only have access to a couple food sources. If you want to live like a caveman go right ahead and have fun foraging for food in the winter and starving when your hunt goes poorly.
At the end of the day people need to eat well balanced meals. If that means they eat meat from a sustainable source once in awhile than so be it. However, we should all be eating way more plants, cutting out processed crap and drinking more water! Food debates are like the new religion, people have a hard time seeing other folks views.
Best of luck with your hunt Garry!