>

I feel like you're thinking of a specific type of processed food.
In any case, in such cases, it is not unhealthy because it's been processed but because of its constituent components (salt and sugar). In other words, they're not inherently unhealthy.
Just spend 5 seconds looking at  the nutritional content of processed food before you blindly consume it.
They are usually packed with extra salt, sugar, other fillers.  
So in general,  they are less healthy than fresh foods.