Something to keep in mind when discussing just about anything we think we know...
A few examples of studies and articles in the past that told us what was good and what was bad. Taken from this article on common sense vs 'data'
They said saturated fat raises blood cholesterol and, in turn, heart disease. Now, Harvard Health reports that a “meta-analysis of 21 studies found insufficient evidence to conclude that saturated fat increases the risk of heart disease." Relatedly, they used to tell us to replace butter with margarine. Now, Harvard Health tells us it matters little.
Those fat opponents told us to eat more carbs. Then they said carbs are bad for you. But the most recent exhortation, reported in The Lancet, is moderate carbs.
They used to say coffee is bad. Now the consensus is summarized by the Mayo Clinic: For most people coffee is a net plus.
The advice used to be to eat small meals every few hours rather than big meals more hours apart. Now, Harvard Health encourages intermittent fasting: eating nothing for 14-16 hours a day, cramming all your calories into 8 to 10.
They used to tell us that it’s bad to skip breakfast. Now, a recent review of the literature concludes that unless you have diabetes, it doesn’t much matter.
They used to urge us to be thin. Then they said, “slightly overweight” is better. Now, research is back to recommending we be thin: moderately below-average BMI.
The standard recommendation for losing weight included vigorous exercise. But a recent review of the literature finds that exercise has little effect. (Perhaps in part because exercise increases appetite and entitlement.)
The standard recommendation used to be three days a week, 20 minutes of vigorous exercise: 80% of cardiac capacity. Now, it's 30 minutes of at-least moderate exercise every day.
They used to insist that it’s important to stretch before and/or after exercising. Recent metaevaluation suggests it's not.
Until recently, supplements, for example, fish oil and vitamin E, were touted. But recent, authoritative research finds that most vitamin and mineral supplements are “useless:”
They used to say marijuana was dangerous, the oft cited “Reefer Madness.” Then they said pot is innocuous. But as legalization has expanded, there’s been an explosion of research, and per the National Academy of Sciences review of over 100 studies, marijuana is more dangerous to mental and physical health than previously thought.
For decades, they said a glass or two of red wine a night was salutary. Then they said it doesn’t matter if it’s red or white. Then they said beer is fine too. Now, a new study in The Lancet says that even one drink is bad.