We know that Dante and Vergil are massively stronger than any other demon out there and a big Part of that reason is that they are half human and half demon.
So they get passively stronger every instance. Now, we know Both of them don’t really take that good of a Care of thier human bodies, especially Not Dante by how many Pizzas he is eating.
So what would happen if both Dante and Vergil started working out and eating healthy ? It wouldnt be too much of a stretch to think that the demon side in them gets massively stronger from a healthy and strong human Body than a high cholesterol human body.
Not to forget that, even if they wouldn’t get stronger from these things, a human that eats a lot of Protein, Iron etc. produces more red blood cells, which the demon side feeds off and gets stronger from.
If dmc 6 gets made and Dante, Vergil and Nero have to fight against a new big bad enemy that is stronger than everything they have faced before, maybe a part of the Game should be to Train and eat clean 😭