Ask the doctor: How do trans fats harm health?

Q. I know I'm not supposed to consume trans fats, but I'm not sure how they damage health. Can you explain it?

A. Despite what you might have heard for decades, not all types of fats in your diet are bad for you. Monounsaturated and polyunsaturated fats are "good fats." We need the good fats in our diet, in moderation. (Any type of fat contains a lot of calories, and pigging out on "good fats" can lead to unhealthy weight gain.) In contrast, saturated and trans fats are "bad fats."

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