I think the problem might be more that there aren't very many universal results, and the fish and vegetables diet that works for one person won't work for others.
Not really. There's tons of studies on whether some particular food is connected to some very narrow positive or negative outcome for the heart, brain, etc., on which popular ideas about the food being generally good for the heart, brain, etc. are built. (And, from those, even flimsier popular ideas about the food being generally healthy or not.)
ie, you gather medical data from thousands of people and find someone similar on a micro level to the current patient and see what has helped them.
Exactly. The research is starting to show that individual reactions vary dramatically.
That's the ethics of business. We have no healthcare; there's a healthcare industry and we are how it extracts its profits.
This inevitably corrupts the goals of an "ideal world" healthcare system which would exist to provide efficient and affordable healthcare.
We produce shit studies with small sample sizes and dodgy methodologies all the time. They just don't add to the pool of human knowledge.
They actually do. A crappy study with p=.70 isn't enough to justify changing the standard treatment for a disease but it is enough to justify doing the more comprehensive study to see if the result still holds.
We have a choice between doing ten comprehensive studies only to prove that nine of the things didn't work, or using the same resources to do a hundred crappy studies and then repeat the five with the most promising results using the more robust methodology and discover that three of them still hold.
The problem is when the methodology itself is broken. For instance, using case-control methodologies on things with small-to-moderate effect sizes. Past studies comparing such studies with eventual RCTs showed that the case control studies gave absolutely no indication of what the RCTs would show as a consensus: it was entirely random.
There is no amount of money, small or large, worth throwing at studies that shift our prior probability to posterior by 0 units.
If you pick a very strict diet then people drop the diet completely or cheat all the time, resulting in uneven insulin levels.
It is like inflammatory bowel disease. Many doctors rarely prescribe rectal medication for long term use even if it might be more effective than alternatives just because it is difficult enough to get people to take their pills.
But I do think diet suggestions will change more in the future when it comes to diabetes.
I think Doctors need to be better trained, Americans need to completely rethink nutrition and health (I can't speak for other countries), government needs to help inform people, and laws about marketing food may need to be changed.
In addition further research could help, but in my opinion nutrition is a solved problem, eat real food and avoid meat and processed junk.
My opinion is based on how little my friends in the medical profession and/or training know about nutrition and the book How Not to Die which focuses on how diet affects deadly diseases.
I've been 'gotten' by carrots in a crock-pot beef. I miscounted and got waylaid by them.
I sometimes wonder if the state of medical ethics is killing us. We've made it so expensive to do a medical study that nobody is going to do it unless the end result is something they can sell, so the only "solutions" we get are drugs because there is no money to be made in prescribing diabetics a diet of fish and vegetables.
It's a sad state if an individual can learn more by experimenting on themselves than their doctor knows because the doctor isn't allowed to participate in or publish the result of the same experiment without a multi-million dollar budget.