Only Connect S20E02 - Hopsters v Sprouters

Victoria Coren Mitchell hosts the quiz where knowledge only gets you so far – the vital extra ingredients are logic and lateral thinking.

One of the teams likes beer, while the other has a bit of a thing for big vegetables - the bigger the better, apparently. Meanwhile, what's the connection here: 'cat: 200-300', 'mouse: 10-15', 'horse: 15-20k', and 'human: 2-2.5k'?