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Physical activity has long been known to bestow such benefits as helping to maintain a healthy weight and reduce stress, not to mention tightening that abs. Now, a growing body of research is showing that regular exercise — as simple as a brisk 30-to 45-minute walk five times a week — can boost the body's immune system, increasing the circulation of natural killer cells that fight off viruses and bacteria. And exercise has been shown to improve the body's response to the influenza vaccine, making it more effective at keeping the virus at bay. Medical experts say inactivity poses as great a health risk as smoking, contributing to heart disease, diabetes, hypertension, cancer, depression, arthritis and osteoporosis. Even lean men and women who are inactive are at higher risk of death and disease. So while reducing obesity is an important goal. The better message would be to get everyone to walk 30 minutes a day. We need to refocus the national message on physical activity, which can have a bigger impact on health than losing weight.
很早以前，人們就知道體育活動有各種好處，比如幫助保持健康的體重、緩解壓力，更不用說可以讓你擁有結實的腹肌。如今，越來越多的研究表明，定期運動——簡單如每天快走30到45分鐘，每周堅持五天——可以增強人體免疫系統，促進抗擊病毒和細菌的自然殺傷細胞的循環。此外，運動還可以增強人體對流感疫苗的反應，提高疫苗抗病毒的有效性。醫學專家說，不活動帶來的健康風險與吸煙類似，會導致心臟病、糖尿病、高血壓、癌癥、抑郁、關節炎和骨質疏松。甚至是體型瘦削的人，如果不運動，死亡和患病的風險也會增大。有鑒于此，在將減少肥胖作為重要目標的同時，更有益的信息或許是讓人人每天都走上30分鐘。我們需要將全國的注意力轉移到體育運動上來，相對于減肥，體育運動對健康的影響要更大。
