When evaluating research for what you eat, do you focus on short term studies and/or what the substance does to small parts of the body, or long term studies that compare intakes with mortality or health?
Examples: high fat dairy intake (whole milk and cream vs. skim milk) is good for you in long term studies, but short term dairy can cause higher insulin responses.
Caffeine can have immediate effects on blood sugar, blood pressure, adrenal and thyroids, but long term studies correlate high coffee intakes (4 cups) with lower rates of Alzheimer's declines, lowered depression, lower rates of diabetes, and fewer cardiovascular events and strokes.
Short term saturated fat intake can lead to increased cardiovascular events (in the context of a SAD diet), but long term studies suggest the more saturated fat the better.
I tend to look at long term studies, and all their problems, when making food decisions (thus, I drink raw whole milk, eat butter, drink coffee, and eat lots of saturated fats), but tend to dismiss short term studies.
Long term or short term studies for what you personally eat?