Just not sure I buy that she's been Hungry every time her eyes are described as grey, especially when they're described as getting silvery when she is shown to be getting Hungry.
I theorize that Lara cultivates a lowkey Hunger continuously; that she *intentionally* under-Feeds, and if she ever really indulges, then she avoids going out in public for a day or two, until her Hunger begins to stir again.
Being Hungry makes her sharper, more-alert, more-dangerous.
Being Hungry makes her sexier, more physical, more powerful.