體重管理的文章 - 健身

在翻譯體重管理的文章(英翻中)

有個地方不太清楚作者的意思，可否請各位看一下

Most of the research shows that weight loss is more effective when cutting
back on calories [dieting] as opposed to only increasing physical activity
or exercise Weight loss is accelerated, nonetheless, when physical activity
is added to dieting. Body composition changes, however are much more
effective when dieting and exercise are combined while attempting to lose
body weight. Most of the weight loss when dieting with exercise comes in the
form of body fat and not lean body tissue, a desirable outcome.

前面幾句都ok，最後一句的意思看不太懂

謝謝各位!

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