Harvard Health Blog

Why medical research keeps changing its mind

By: Robert H. Shmerling, MD, Faculty Editor, Harvard Health Publishing Did you ever wonder why medical research seems to flip-flop so often? Eggs used to be terrible for your health; now they’re not so bad. Stomach ulcers were thought to be due to stress and a “type A personality” but that’s been disproven. I was taught that every postmenopausal woman should take hormone replacement therapy to prevent heart disease and bone loss; now it’s considered…

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