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1. We will see.It's not a fad....
I agree - as I said very early on, our system is broken, and all the incentives are to ignore the obesity, let the obese stay that way, then make money treating all the chronic illnesses.
Epidemiological evidence is very, very weak. If you spend 5 minutes you'll find studies of the same data set that find no association between carbs and risk of disease/death, and that if one controls for diet quality - i.e. treats those who eat whole foods as a different diet than those whose carbs came from cokes and white bread and cake - that low carb diets reduce risk, and that high carb diets can also reduce risk, if the carbs are quality/whole foods. So what kind of carbs matters - broccoli =/= cake with frosting =/= sweet potato/carrots/squash =/= waffle with maple syrup. That's ****ing obvious, but your study ignored that entirely.
So you can find what you want in the data, which makes them virtually useless for nutrition. We found "associations" between fat and heart disease 60 years ago and that myth still won't die. They forgot to account for smoking.... So we got low fat foods, laced with sugar, recommendations to BASE our diets on highly refined carbs, breads, pastas, which is garbage food for the keto crowd and vegans, something everyone can agree on today. We still live with that mistake - look at your 'yogurt' aisle. Lots of fat free yogurt, with 25g of added sugar. HEALTHY!!! That's from epidemiological studies and 'associations.'
But 220g of carbs per day, 40% of caloric intake per day - what the study called "low carb" - is NO ONE'S DEFINITION OF LOW CARB. You can't have any grasp of the theory behind LCHF or keto and expect any of the benefits of an LCHF diet consuming 220g of carbs per day, and the authors knew it. The upper limit is something like 100g per day, and that's for people in reasonably good metabolic health, which would exclude the 122 million in this country with T2 or pre-T2, and that's who the diet is aimed at.
The reason they should be tried is they work, they actually reverse diabetes, get people off drugs, off insulin, no longer subject to wild swings in blood sugar. People feel better, they lose weight, mental health often improves, the diet reverses NALFD, lowers blood pressure.
We also know what doesn't work in the long run - the alternatives. Using the standard treatment, diabetes is chronic and progressive, more insulin, more weight gain, more insulin, more weight gain, hacked off limbs, blindness, and a dozen or so chronic conditions tied directly to obesity and T2, including a greater risk of cancer, heart attack, stroke.
No, the diets aren't for everyone, but they ought to be a standard, recommended option, because they work better than anything else. And you can't have long term data until people in enough numbers are on the diet long term, and have support from their doctors, nutritionists, counselors, etc. along the way.
2. The system isn't broken. The healthcare system has never been designed for preventative medicine.
What's the problem is huge societal changes that have led to an explosion of obesity.
3. Yeah no. There are good studies out there.
The problem is always the fads that build around them by lay people that want to capitalize on the findings.
Frankly..we may find out some of these low carb high fat diets are more of the same.
4. If the only way that a low carb high fat diet can show long term gains is if" have support from their doctors, nutritionists, counselors, etc. along the way."
Then frankly it's impractical.