Please can we get off the subject of dieting?

我们别再谈论节食这个话题行吗？

Lett's get off the subject of work! Let's talk about something pleasant!

我们别谈工作了！让我们谈些愉快的事情吧！ ！

I think you are getting off the subject. Could we get back to the main point, please?

我觉得你跑题了。 我们能不能回到主题上来?。