Caffeine is classified by the FDA and generally recognized as safe and there has been no evidence produced that shows caffeine to be harmful to health.

咖啡因被美国食品和药品管理局(FDA)列为违禁药品，但普遍的也被人们认为是安全药品。目前还没有证据表明咖啡因对人体健康有害。

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While consuming such heavy metals is widely known to be harmful to health, there is little research done so far about their impact when inhaled into the body.

众所周知，这些重金属的摄入对人体有害。然而，至今为止，仍没有对其吸入人体会产生何种影响进行调查研究。

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She said it was unclear how mobile phone radiation might affect brain metabolism and added that more studies were needed to investigate whether the effects could be harmful to health.

她说手机的辐射怎样影响脑代谢尚不清楚，还说需要更多的去研究去调查这些影响对健康是否有害。

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Prolonged sitting can be harmful to your health because of the lack of muscle contractions and subsequent body movement.

FORBES: Why Sitting Increases Your Risk of Dying Sooner

Drug concentrations in water are not thought to be harmful to human health, although concerns remain over possible effects on plant and animal life.

BBC: University studies drug residue pollution in water

The answer is that asset-price inflation can be harmful to economic health in the same way as inflation in the prices of goods and services.

ECONOMIST: Should central banks try to target asset-price inflation?