go on a diet 与 lose weight有什么不同,用法有异吗

go on a diet：按规定饮食进食;开始节食【强调节食这一行动的开始】.lose weight：减肥；体重减轻（=take off weight)【侧重节食、减肥的效果】例如：After going on a diet for a year,she lost her weight obvious...