I remember about five (?) years ago when both the English language terrestrial channels had basically the same schedule, anchored around a second-rate film at 9.30. Then ATV World changed to a lineup that was based around documentaries, though they subsequently added more drama and a lot of sport (mainly horse racing). Gradually, TVB Pearl has added more documentaries and drama and also cut back on the films. So now the two channels once again have similar schedules!
Pearl insist on creating themes for the programs they buy, including the so-called "MI 9-30" slot (they don't seem to care that actually the programmes are transmitted at 9.35 or 9.40 rather than 9.30). I have to give them credit for showing some interesting documentaries in this slot, usually from the BBC or Discovery Channel.
This week they showed a BBC 'Horizon' documentary about the Atkins Diet that was first aired in the UK in January. The programme got significant coverage at the time (here for example, registration required) because the diet has been regarded as something of a mystery scientifically. How could people eat more and still lose weight?