Someone is telling about how she has bought a weigh-loss jab and had to be hospitalized. She says:
"I thought why not give it a go. It sounds really good. Everyone's losing weight on it." ITV-This morning (see 1:38-1:42)
The expression "....losing weight on it?" caught my attention. From the context I understand that "....on it" at the end of the sentence means "... by it" or "...through it?"
But I wonder if it is colloquial, because I've not seemed to come across this usage?