减肥在英语口语中常用的表达有：

lose weight

on a diet

slim down

reduce weight

例如：

I'm on a diet to lose some weight.

There are no such things as "slimming" foods.

Yoga and Pilates can help you slim down.

Losing weight is a slow and gradual process.

这些表达可以帮助你在日常英语交流中谈论减肥的话题