I have been a practicing Pharmacist for over 40 years. I have seen "studies" come and go. Studies taken out of context or inadequate review cause many problems.
For example; many years ago there was a study that showed Oat bran lowered heart disease. So, the local cardiologist had the pharmacy stock Oat bran flakes that the patient was to sprinkle over his food for each meal. What a joke! Oat bran tastes like shredded cardboard and covering each meal with this stuff was just disgusting. The patients refused to use it. So much for current "studies". The common sense approach is that using diet to control disease must be done over an entire lifetime, not at the last few years of life. Now I am in favor of oat bran in a palatable form such as oat meal or toasted oat cereals in little round circles. But do not expect to see results in just a few weeks or months.
One last comment; the best studies use a large group of people to draw a conclusion. Any individual may or may not be consistent with the results of the "study". When I hear people quote a "study", I think to myself, here we go again. The practical application of "study" results may or may not apply to a specific individual.