I'd like to think that, like how a dairy cow needs to be milked regularly to avoid infraction and lactic build up, a Tropius would likewise need to produce fruit to avoid a surplus of sugar in its leaves/body and by refusing to let anyone take it's fruit you would be therefor endangering it of suffering from similar infection if not a fatal blood sugar level and some chick on tumblr just wanted to disagree with and consequently complain about something and this is what first caught her attention.

TL;DR eat the fucking fruit

If my dog was part plant, maybe.