It depends on what you call a vegetable. In the US, corn, potatoes, and ketchup are considered vegetables.

You need to make a distinction between leafy greens and starch.

Well, corn and potatoes are indeed vegetables, so there's that. And I think the only person who ever said ketchup was a vegetable with a straight face was Ronald Reagan 40 or 45 years ago.

"Eat your vegetables. They're good for you." shouldn't mean dipping your fries in ketchup. But that is what happens if you call corn and potatoes as vegetables.