假设你是李华，你在英国的笔友Tommy最近为自己发胖感到苦恼。请你根据所给提示，给他发一封电子邮件。
邮件内容包括：1.可能造成发胖的原因 (如饮食、锻炼……) 至少写出两条
2.简述你自己相关的健康生活方式。
注意：邮件开头和落款已经为你写好，只把正文写在答题卡上。
Dear Tommy,
    I am really feeling bad that you are being troubled by overweight these days.
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Yours,
Li Hua