Body weight is not always the best indicator of health and a thin person still needs to eat well and exercise regularly.

体重并不总是健康的最佳指标，瘦的人仍然需要吃得好，有规律地锻炼。

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But whether you are fat or thin, young or old, the best hope you have of guarding your brain is to eat well and exercise.

无论你是胖是瘦，年轻还是年老，保卫大脑的最佳选择还是健康的饮食和锻炼。

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I've seen her eat, and she's just thin.

我见过她吃东西，她只是瘦而已。

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Some thin people exercise excessively and don't eat a balanced diet, and there are people in the overweight and obese categories who have good diets and are active, she said.

CNN: Thin is in, but fat might be better