re: Best diet plan to lower cholesterol//LDL/Triglicerides

All you gotta do is google this baw to realize what you’re saying is incorrect

Studies absolutely can be controlled. Maybe not perfectly controlled, but a good study removes as many variables as possible. Nutrition studies are generally terrible quality and often involve food questionnaires which are completely worthless. However there are good nutrition studies that are done on a metabolic ward with every calorie and nutrient controlled. Pennington does these.

Speaking of, here is a study done in a metabolic ward that showed that increasing saturated fat increased LDL particle size. It was in people with metabolic syndrome which is a weakness.
LINK

I found a study that purports to show increased saturated fat intake was associated with larger ldl particles. However it’s a poorly designed study. It appears to be a subsequent analysis of a study comparing a high fat diet, which included all types of fats, and a low fat diet. It seems they used a food log to determine who consumed more SFAs than others. The fact that it’s a subsequent analysis (which often in research means the scientific method was done in reverse: a statistically significant difference was found then the hypothesis was asked) and relies on food logs makes the conclusion dubious.
LINK

ETA: Here’s a better designed study from the same senior author as the questionable study above which comes to the opposite conclusion: increased small and medium LDL’s with increased saturated fat intake. Quality is in between the two stories above, not in a metabolic ward, but the study was prospective, patients were randomized, they were healthy (not insulin resistant, normal triglycerides), researchers doing the lipid and data analysis were blinded to patient group, patients were provided food, etc.
LINK